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HJ 168-2020 Related PDF English (HJ168-2010, HJT168-2004)

HJ 168-2020 (HJ168-2020) & related versions
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HJ 168-2020English899 Add to Cart 6 days (Technical Guidelines for the Establishment of Environmental Monitoring Analysis Method Standards) HJ 168-2020 Valid HJ 168-2020
HJ 168-2010EnglishRFQ ASK 6 days Enviromental monitoring. Technical guideline on drawing and revising analytical method standards HJ 168-2010 Obsolete HJ 168-2010
HJ/T 168-2004EnglishRFQ ASK 9 days Technical guideline on drawing environmental monitoring analytical method standards HJ/T 168-2004 Obsolete HJT 168-2004



HJ 168-2020 (Technical Guidelines for the Establishment of Environmental Monitoring Analysis Method Standards) National Ecological Environment Standard of the People's Republic of China Replace HJ 168-2010 Technical Guidelines for the Establishment of Environmental Monitoring Analysis Method Standards Technical guideline for the development of environmental monitoring analytical method standards 2020-12-29 release 2021-04-01 implementation i table of contents Foreword...ii 1 Scope of application...1 2 Normative references...1 3 Terms and definitions...1 4 Basic requirements...3 5 Technical route for standard formulation...3 6 Method validation...7 7 Structural elements of the standard...9 8 Main technical content...10 Appendix A (Normative appendix) Method for determining method characteristic index...18 Appendix B (Informative Appendix) Method Comparison. Test for Significant Difference of Measurement Results...25 Appendix C (informative appendix) Content requirements of the argumentation report...26 Appendix D (informative appendix) Content requirements for standard preparation instructions...29 Appendix E (Informative Appendix) Content Requirements of Method Validation Report...34 1 Technical guidelines for the development of environmental monitoring and analysis method standards 1 Scope of application This standard specifies the basic requirements, technical routes, standard text and related Technical requirements for technical documents. This standard applies to the formulation of environmental monitoring and analysis method standards. 2 Normative references This standard quotes the following documents or their clauses. For undated reference documents, their valid versions are applicable to this standard. GB/T 6379 Measurement method and accuracy of results (accuracy and precision) (ISO 5725) GB/T 7714 Information and literature reference description rules GB/T 8170 Numerical rounding rules and the expression and determination of limit values HJ 565 Environmental Protection Standard Compilation and Publication Technical Guide JJF 1059.1 Evaluation and expression of measurement uncertainty 3 Terms and definitions The following terms and definitions apply to this standard. 3.1 Method detection limit The lowest concentration or the smallest amount of the substance to be tested can be qualitatively detected from the sample within a given confidence level by a specific analytical method. 3.2 Minimum quantitative detection limit On the premise that the limited error can meet the predetermined requirements, the specific analysis method can accurately and quantitatively determine the maximum value of the substance to be tested. Low concentration or minimum amount. 3.3 Maximum quantitative detection limit On the premise that the limited error can meet the predetermined requirements, the specific analysis method can accurately and quantitatively determine the maximum value of the substance to be tested. High concentration or maximum amount. 3.4 Determination range The range between the lower limit of measurement and the upper limit of measurement. 3.5 Precision The degree of agreement between independent test results under specified conditions. 23.6 Repeatability Refers to using the same method by the same operator on the same object under test in the same laboratory, using the same instruments and equipment, The degree of consistency between independent test results under the same test conditions. 3.7 Repeatability limit For a value, under repeatability conditions, the probability that the absolute difference between the two test results does not exceed this number is 95%. Note. The symbol of repeatability limit is r. 3.8 Reproducibility Also known as "reproducibility", it refers to the use of the same method by different operators on the same object under test in different laboratories. Using the same instrument and equipment, under the same test conditions, the degree of agreement between the test results obtained. 3.9 Reproducibility limit For a value, under the condition of reproducibility, the probability that the absolute difference between the two test results does not exceed this number is 95%. Note. The reproducibility limit symbol is R. 3.10 Trueness The degree of agreement between the average value of the measured value of repeated measurements and a reference value. 3.11 Accuracy The degree of agreement between the measured value of the measured value and its true value. Note. The accuracy of the measurement result is characterized by two indicators of accuracy and precision. 3.12 Uncertainty uncertainty It characterizes the parameters that are reasonably assigned to the dispersion of the measured value and are related to the measurement result. Note 1.This parameter can be the standard deviation or its multiples, or it indicates the half-width of the confidence interval. Note 2.The uncertainty is composed of multiple components, and the standard uncertainty of each component must be evaluated. The evaluation methods are divided into A and B categories. Type A evaluation is to use the method of statistical analysis on the observation column, which is characterized by the experimental standard deviation; Type B evaluation is different from Type A Other methods are characterized by the estimated standard deviation. Note 3.The measurement result should be understood as the best estimate of the measured value, and all the uncertainty components contribute to the dispersion, including those The component caused by system effects. 3.13 Laboratory sample Collect samples that are stored and sent to the laboratory for testing. 3.14 Test sample Prepare samples from laboratory samples and draw samples from them. 3.15 Test portion Take it from the sample (if the sample and the laboratory sample are the same, take it from the laboratory sample) and use it for 3 A certain amount of materials tested or observed. 3.16 Blank test Refers to the test that does not contain the substance to be tested, using the same procedure as the laboratory sample. The corresponding sample is called It is a blank sample, referred to as blank. 3.17 Calibration Under specified conditions, in order to determine the value represented by the measuring instrument or measuring system or the value represented by the physical measuring tool or standard material A set of operations corresponding to the relationship between the measured known values. 3.18 Qualitative method An analytical method that identifies substances based on their chemical, biological or physical properties. 3.19 Quantitative method The analytical method for measuring the amount of the substance to be measured can be expressed in numerical values in appropriate units. 4 Basic requirements 4.1 The method and standard should be able to meet the ecological environmental quality standards, ecological environmental risk control standards, and implementation of pollutant discharge standards The needs of other ecological environment management work should be connected with relevant standards such as environmental monitoring technical specifications. 4.2 The method adopted by the method standard should be stable and reliable, scientific, reasonable, practical, and capable of realizing the value Traceability. 4.3 The method standards are complete, accurate, easy to understand, and easy to implement. 4.4 The technical documents and data related to the method standards should be complete. 4.5 The method standards shall not stipulate that the technology, products and services of a specific company shall be adopted, and the brand name of a specific company shall not Said that it is not allowed to use patented technology and undisclosed reagents that are still in the protection period. 4.6 Reagents that are banned or eliminated by the state shall not be used in the method standards. 5 Technical route for standard formulation 5.1 General requirements The main technical content of the standard formulation of environmental monitoring analysis methods includes standard formulation demand analysis, domestic and foreign related standards Standard and literature research, method condition test research, method characteristic index confirmation in laboratory, method comparison, method verification, and Standard text and compilation instructions are compiled, and the technical route is shown in Figure 1. 5 Route, application situation, etc., and the content to be used for reference. 5.3.2 Investigate the relevant method standards of other countries and international organizations, and clarify the scope of application of relevant foreign method standards, Determine the target, technical route, application situation, etc., and the content to be used for reference. 5.3.3 Collect literature on relevant analysis methods, study the conditional factors of method establishment, and clarify the content to be used for reference. 5.3.4 Clarify the method standard target and the analysis method to be adopted, and clarify the conditions that need to be studied and analyzed in the process of method establishment Factors, put forward the test plan and main work content, and form the technical route of method establishment. 5.4 Method condition test study 5.4.1 Experimental research on sample collection and storage conditions a) On the basis of relevant environmental monitoring technical specifications, research and propose methods for special requirements for sample collection, including Including sampling methods, sampling equipment, reagent materials, etc., carry out sampling efficiency or penetration test research when necessary; b) Research and propose methods for the requirements of sample storage utensils, preservatives, storage time and temperature; c) Research and put forward requirements for the preparation and storage time of standard solutions and other related reagents and materials; d) When necessary, study and put forward requirements for sample pretreatment at the sampling site. 5.4.2 Experimental research on sample pretreatment conditions a) Research and propose methods for sample digestion, extraction, enrichment, purification and other pretreatment conditions; b) Carry out necessary penetration tests, propose adsorption and enrichment capacities under certain conditions, and appropriate injection volume and determination Concentration range c) Study the applicability of using this method for determination of high-concentration (content) samples after dilution, and propose the dilution operation Claim. 5.4.3 Interference test research a) Analyze the interference (signal, peak, etc.) to the target; b) When the conditions are met, the interfering substances and the amount of interference should be specified; c) Combining literature and experiments, research and propose methods to eliminate interference. 5.4.4 Experimental research on analysis and test conditions a) Research and propose methods and requirements for sample preparation; b) Research and put forward requirements for instrument debugging and calibration parameters; c) If a calibration curve needs to be established, the best linear range should be determined according to the experiment, and the relevant ecological Convergence of limit concentration (content) levels in standards, ecological environment risk control standards, and pollutant discharge standards; Generally, at least 6 calibration points (including zero concentration) are required to be distributed as evenly as possible in the linear range, quantitative Method The correlation coefficient of the linear regression equation is not less than 0.999; d) If the average relative response factor is used for calculation, it is generally required that the relative standard deviation of the relative response factor does not exceed 20%; e) Research and propose the operation steps and condition parameters of the determination. If the target is not detected in 7 products, the sample can be obtained by adding standard to the actual sample matrix. 5.6.5 Collect at least 7 samples with similar concentration levels for each type of actual sample, and adopt the new method and the standard of the comparison method respectively Perform measurement and obtain at least 7 sets of paired measurement data. When sufficient actual sample quantity cannot be obtained, actual sample can be used At least 7 sets of paired measurement data are obtained by the method of matrix addition. The paired sample t test method can be used to determine the two methods of determination Whether the results are significantly different, see Appendix B for specific methods; other applicable statistical test methods can also be used according to specific conditions law. 5.7 Method verification Method verification is performed in accordance with the requirements of Chapter 6. 5.8 Standard text and compilation instructions 5.8.1 The structural elements of the standard text shall be implemented in accordance with the requirements of Chapter 7. 5.8.2 The standard text is compiled in accordance with the requirements of Chapter 8. 5.8.3 The standard opening report and preparation instructions shall be prepared in accordance with the requirements of Appendix C and Appendix D. 5.9 Calculation rules for approximate results during research 5.9.1 When adding and subtracting approximate values, the number of significant digits of the sum or difference obtained shall be the same as the number of digits after the decimal point in each approximate value. with. In the process of calculation, one more decimal place can be kept, and the numerical value of the calculation result is rounded according to the requirements of GB/T 8170. 5.9.2 When the approximate value is multiplied and divided, the resultant product and the number of significant digits of the quotient shall be the same as the number of significant digits of each approximate value. with. In the process of calculation, you can first round each approximate value to one more than the one with the least significant number of digits, and finally calculate the result. The results are processed according to the above rules. 5.9.3 When the approximate value is squared or rooted, the number of significant digits of the calculation result is the same as that of the original approximate value. 5.9.4 In the logarithmic calculation of the approximate value, the number of digits after the decimal point of the result (excluding the leading digit) should be the same as the significant digits of the original number The numbers are the same. 5.9.5 When calculating the average of four or more values with close accuracy, the effective digits can be increased by one. 5.9.6 If the quantitative value of a certain type of substance is obtained by adding the measurement results of multiple components (such as total xylene, organochlorine The total amount of medicine, etc.), the contract should be calculated before revision, and no second revision should be made. 6 Method verification 6.1 General requirements 6.1.1 The purpose of method verification is to further confirm the scientificity of the method, and to examine the applicability and feasibility of the method under various environmental conditions. Operate, and finally determine the characteristic index and quality assurance and quality control requirements of the method according to the data of each verification laboratory. 6.1.2 The characteristic indexes of each type of method verification are the same as those confirmed in the laboratory. See Table 1 for details. 6.1.3 The draft method standard shall be verified by at least 6 laboratories. The laboratories participating in the method verification should pass the inspection and testing machine Qualification accreditation or laboratory accreditation, with verification experiment conditions; should cover a representative geographical area (or typical environmental Files), and can cover all levels of national environmental monitoring agencies. If the 6 verification laboratories cannot be obtained, the same A laboratory is divided into groups of different personnel, and uses different equipment, environmental conditions and different batches of reagent materials as much as possible. Exhibition verification. 86.1.4 The standard preparation team shall prepare a method verification plan, based on the main factors affecting the accuracy (precision, correctness) of the method Factors and mathematical statistics require selection of appropriate sample types, instruments and equipment, analysis time, etc. Verification instruments and equipment should Cover the main types of the market, including domestic instruments and equipment as much as possible. 6.1.5 Use certified reference materials/standard samples (or samples prepared with commercially available reagents and standard samples) and actual samples For method verification, actual samples should try to cover the applicable scope of the method standard. The verification samples should be compiled as standard as possible 1.The samples distributed to the verification laboratories, or the samples with the same matrix (abbreviated as As a "uniform sample"). In principle, the verification sample should be a highly uniform sample. When the sample cannot be homogenized (such as metal, rubber Solid waste samples such as glue or textiles), the verification data should indicate the type of sample that is only applicable to the test. 6.1.6 The reagents and materials, instruments and equipment and analysis procedures used in the method verification process should meet the relevant requirements of the method. 6.1.7 Before the method verification, the operators participating in the verification should be familiar with and master the method principle, operation steps and process. Should receive training when. 6.1.8 The operators participating in the verification and the standard preparation group should truthfully fill in the "Method Verification Report" as required (see appendix E) "Original Test Data Sheet", and attach a map or other equipment produced by the instrument that matches the content of the original test data sheet. Health record printouts, etc. 6.1.9 Refer to the relevant content in GB/T 6379 for the elimination method of abnormal values during the verification process. Explain, correct, or eliminate fully explain. 6.1.10 The standard preparation team will finally form the "Method Validation Report" based on the method verification data and statistics, analysis and evaluation results. 6.2 Specific requirements 6.2.1 Verification of the detection limit If the method in Appendix A.1.1 is used to determine the detection limit, each verification laboratory shall use a uniform sample and follow the method operation steps and flow. Process analysis operations, calculate the average value, standard deviation, relative standard deviation, detection limit and other parameters of the results. The method detection limit determined by each verification laboratory is. the detection limit value calculated according to the method in Appendix A.1.1, and the instrument The detection limit is compared and the larger value is used. The final method detection limit is. the highest value of the method detection limit determined by each verification laboratory. 6.2.2 Verification of precision Determination of certified reference materials/standard samples (or samples prepared with commercially available reagents and standard samples). each verification laboratory Use high (concentration or content near 90% of the upper limit of the linear range of the calibration curve), medium (concentration or content near the middle point of the calibration curve) Content), low (concentration or content near the lower limit of determination) 3 uniform samples with different concentrations or The samples are measured in parallel for at least 6 times, and the average value, standard deviation, and relative standard deviation of each concentration or content sample determination are calculated respectively. Difference and other parameters. Measurement of actual samples. Each verification laboratory shall deal with 1 to 3 concentrations or contents of each sample type within the applicable scope (should Contain as much as possible the concentration of applicable ecological environmental quality standards, ecological environmental risk control standards, and pollutant discharge standard limits Or content) of the sample, each sample is tested in parallel for at least 6 times in the whole procedure, and the concentration or content of each type of sample is calculated separately. The average value, standard deviation, relative standard deviation and other parameters of the measurement sample. If it is not possible to obtain the appropriate concentration or content For international samples, the actual sample matrix can be used for verification (when the sample is detected, the concentration of the standard addition should be 0.5~ 3 times; when the sample is not detected, the spiked concentration should include the applicable ecological environmental quality standards and ecological environmental risk control as much as possible 8.4 Standard name 8.4.1 The standard name adopts a three-stage expression, namely. the environmental monitoring elements to which the method standard applies, and the target analyzed The name of the substance and analysis method. 8.4.2 The English name of the standard should be written. Example 1.Determination of dissolved oxygen in water quality by electrochemical probe method Water quality-Determination of dissolved oxygen-Electrochemical probe method Example 2.Determination of Volatile Halogenated Hydrocarbons in Soils and Sediments Purge and Trap/Gas Chromatography-Mass Spectrometry Soil and sediment-Determination of volatile halohydrocarbons-Purge and trap gas chromatography mass spectrometry method 8.5 Warning When using this standard, the reagents and materials that are highly toxic, flammable, explosive, corrosive, radioactive, and highly volatile should be given. Materials, as well as safety and protection items that require special attention. 8.6 Scope of application 8.6.1 The environmental monitoring elements, targets and analysis methods applicable to the standard shall be explained. 8.6.2 The detection limit, lower limit of determination and upper limit of determination (if necessary) or measurement range of the target should be stated. If needed, give The detection limit and the lower limit of determination corresponding to different sampling situations, different sample sizes, and different test conditions are shown. For multiple goals The standard of the substance, the detection limit of its method, the lower limit of determination, etc. can be listed in the standard as a "normative appendix". 8.6.3 If several analytical methods are included in the standard, the applicable scope of each analytical method should be clearly indicated. 8.6.4 The content that is not included in the standard name but needs to be explained. 8.6.5 When necessary, the circumstances under which the standard is not applicable shall be clarified. 8.6.6 When necessary, the types of methods involved in the standard, applicable work content, etc. (such as screening, emergency Speed monitoring, etc.). 8.7 Normative references 8.7.1 Normative references refer to the various standards cited in the standard text. The country’s abolished standards need to be quoted accurately, The standard year number and specific terms should be indicated. 8.7.2 Generally, the following expressions are used as the introductory phrase, "This standard quotes the clauses in the following documents. Any quotation without a date The effective version of the document is applicable to this standard. " 8.7.3 The cited documents are arranged in the order of GB, GB/T, HJ, and other standards, and their numbers are arranged in ascending order. 8.8 Terms and definitions 8.8.1 Definitions necessary for understanding the terms in the standard shall be given. 8.8.2 The terms and definitions should try to adopt the definitions in the national ecological environment standards and other related standards. 8.9 Principle of the method 8.9.1 Briefly describe the basic principles, method characteristics and main steps of the method. 8.9.2 When chemical reactions are involved, in principle, chemical equations should be written. If the reaction cannot be completed in one step, each One-step reaction equation. 8.10 Interference and cancellation 8.10.1 On the basis of the interference experiment, propose the links and factors that interfere with the method. 8.10.2 When there is inter...... ......


HJ 168-2010 Enviromental monitoring.Technical guideline on drawing and revising analytical method standards National Environmental Protection Standard of the People's Republic Replace HJ/T 168-2004 Environmental monitoring analysis method standard revision Technical guidelines Environmental monitoring-Technical guideline on drawing and revising Analytical method Published on.2010-02-25 2010-05-01 Implementation Ministry of Environmental Protection released Ministry of Environmental Protection announcement No. 25 of.2010 In order to implement the "Environmental Protection Law of the People's Republic of China" and ensure the quality of environmental monitoring and regulation, the environmental monitoring points are now approved. The Technical Guidelines for the Standardization of Methods and Standards for Revision are national environmental protection standards and are issued. The standard name and number are as follows. The standard was implemented on May 1,.2010 and published by the China Environmental Science Press. The standard content can be found on the website of the Ministry of Environmental Protection. From the date of implementation of the above standards, the following standards are abolished. Technical guidelines for the development of standards for environmental monitoring and analysis methods (HJ/T 168-2004). Special announcement. February 25,.2010 Content Foreword..iv 1 Scope..1 2 Normative references..1 3 Terms and Definitions.1 4 working procedures..3 5 basic requirements..4 6 standard structural elements..5 7 Main technical content 5 8 Method Verification 11 Appendix A (Normative Appendix) Method for determining the characteristics of the method.12 Appendix B (informative appendix) Content requirements for the opening of the argumentation report.17 Appendix C (informative) Content requirements for standard preparation instructions.20 Appendix D (informative) Content requirements of the method validation report 24 Iv Foreword To implement the "Environmental Protection Law of the People's Republic of China", "Water Pollution Prevention and Control Law of the People's Republic of China" Dyeing Prevention and Control Law, Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Wastes, Implementing the National Environmental Protection Standards Revision and Management Office Law, standardize the standardization and revision of environmental monitoring and analysis methods, ensure the quality of work, improve work efficiency, and develop this standard. This standard is a revision of the Technical Guidelines for the Development of Standards for Environmental Monitoring and Analysis Methods (HJ/T 168-2004). This standard was first published in.2004. The original standard drafting unit was China Environmental Monitoring Station and Nanjing Environmental Monitoring Center Station. this time For the first revision. This revision mainly focuses on the revision and revision of the environmental monitoring and analysis method standards, basic requirements, and the main standards of environmental monitoring and analysis methods. The technical content was re-made with technical content, as well as method validation, standard opening report and standard preparation instructions. From the date of implementation of this standard, the Technical Guidelines for the Standardization of Environmental Monitoring and Analysis Methods (HJ/T 168-2004) shall be abolished. Appendix A of this standard is a normative appendix, and Appendix B to Appendix D are informative appendices. This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection. This standard is mainly drafted by. China Academy of Environmental Sciences, National Environmental Analysis and Testing Center and Jiangsu Environmental Monitoring Center. This standard was approved by the Ministry of Environmental Protection on February 25,.2010. This standard has been implemented since May 1,.2010. This standard is explained by the Ministry of Environmental Protection. Technical Guidelines for Standardization and Revision of Environmental Monitoring and Analysis Methods 1 Scope of application This standard specifies the working procedures and basic requirements for the standardization and revision of environmental monitoring and analysis methods, and the standard texts and related technical documents. Made a request. This standard applies to the revision and revision of environmental monitoring and analysis method standards. 2 Normative references The contents of this standard refer to the following documents or their terms. For undated references, the valid version applies to this standard. GB/T 6379 Accuracy of measurement methods and results (correctness and precision) GB/T 6682 Analytical laboratory water specifications and test methods (ISO 3696.1987, MOD) GB/T 7714 post-reference reference description rules GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values HJ 565 Environmental Protection Standards Compilation and Publication Technical Guide JJF 1059 Measurement Uncertainty Evaluation and Representation Measures for the Administration of the Revision and Revision of National Environmental Protection Standards (Announcement of the State Environmental Protection Administration, No. 41 of.2006) 3 Terms and definitions The following terms and definitions apply to this standard. 3.1 Method detection limit The lowest or minimum amount of the substance to be tested can be qualitatively detected from the sample within a given confidence level using a particular analytical method. 3.2 Minimum quantitative detection limit Under the premise that the limit error can meet the predetermined requirements, the minimum quantitative detection limit of the substance to be tested can be accurately and quantitatively determined by a specific method. 3.3 Maximum quantitative detection limit Under the premise that the limit error can meet the predetermined requirements, the specific quantitative detection limit of the substance to be tested can be accurately and quantitatively determined by a specific method. 3.4 Determination range The range between the lower limit of measurement and the upper limit of measurement. 3.5 Precision precision The degree of agreement between independent test results under specified conditions. 3.6 Repetitive repeatability In the same laboratory, using the same method, the same instrument uses the same instrument and equipment for the same object, in the same test The degree of agreement between test results independent of each other under test conditions. 3.7 Repeatability limit A value, under repetitive conditions, the probability that the absolute difference between the two test results does not exceed this number is 95%. Note. The repeatability limit symbol is r. 3.8 Reproducibility Also known as "reproducibility", it means that in the same laboratory, the same instrument is used by the same operator by the same method. The degree of agreement between the test results and the equipment under the same test conditions. 3.9 Reproducibility limit A value, under reproducibility conditions, the probability that the absolute difference between the two test results does not exceed this number is 95%. Note. The reproducibility limit symbol is R. 3.10 Accuracy The degree of agreement between the test results and the accepted reference values. 3.11 Uncertainty A parameter that reasonably imparts dispersibility to the measured value, associated with the measurement. Note 1. This parameter can be the standard deviation or its multiple, or the half width of the confidence interval. Note 2. Uncertainty consists of multiple components, and each component is evaluated for its standard uncertainty. The assessment methods are divided into two categories. A and B. Class A assessment is used The statistical analysis method of the observation column is characterized by the experimental standard deviation; the B-class evaluation uses other methods different from the A-class to estimate the standard deviation table. Sign. Note 3. The measurement results should be understood as the best estimate to be measured, and all uncertainty components are contributed to the dispersion, including those caused by system effects. Component. 3.12 Laboratory sample Samples sent to the laboratory for testing. 3.13 Test sample A sample prepared from a laboratory sample and from which a sample is taken. 3.14 Sample test portion Obtained from the sample (if the sample is the same as the laboratory sample, it is taken from the laboratory sample) and used for testing or observation A certain amount of material. 3.15 Blank test blank test Refers to the test of the sample containing no substance to be tested using the same procedure as the actual sample. The corresponding sample is called a blank sample, Jane Call it blank. 3.16 Calibration calibration Under specified conditions, in order to determine the value of the measuring instrument or measuring system or the value of the physical measuring instrument or standard substance and the corresponding A set of operations that measure the relationship between known values. 4 working procedures The standardization and revision of environmental monitoring and analysis methods shall be carried out in accordance with the procedures stipulated in the Measures for the Administration of the Revision and Work of the National Environmental Protection Standards. (see picture 1). Standard management department issues standard revision plan The standard preparation team conducts investigations on various existing analytical methods and monitoring requirements for target pollutants. Standards preparation team prepares the opening statement and draft standard The standard preparation team determines and improves the technical content of the draft standard through experiments. The standard editor-in-chief selects the verification laboratory as required, and organizes the method verification work. Standards preparation team prepares draft standards and preparation instructions Form an exposure draft Standard management department organization for comments Standard compilation group summary processing opinions Standards compilation group revised draft standard and preparation instructions Form a draft for review Standard management organization technical review Standards compilation group revised draft standard and preparation instructions Form a draft The standard preparation team summarizes and processes the verification data to form a verification report. Meet expected requirements by Standard management department administrative review, approval, numbering, release Standard editorial unit established standard preparation group Standard Management Department Organization Opening Ceremony by Standard project evaluation Methodological technique The target did not meet expectations Claim Did not pass Did not pass Figure 1 Environmental monitoring analysis method standard revision work procedure 4.1 Establishment of standard preparation group and opening argument After receiving the standard revision project plan, the standard editorial unit shall be established within 2 months (or convene each participating unit to be established). Group. The standard preparation team conducts investigations and studies on the existing methods and monitoring requirements in accordance with the requirements of the standard system revision project plan. After the comparison, the work plan is proposed and the open-ended argumentation report is prepared, and the draft standard is preliminarily prepared. Hosted by the standard management department to hold a standard open question Argumentation, organize relevant experts and representatives to review the opening of the argumentation report, the standard preparation group based on the method principle determined by the opening ceremony Technical route to further carry out experimental research work. The content requirements of the opening report are given in Appendix B. 4.2 Methods Experimental work The standard preparation team initially determines the technical content of the draft standard through experimental research, and optimizes the technical parameters and conditions of the method. Test, determine the specific technical content and the detection limit, the lower limit of measurement, the precision and accuracy of the laboratory and other method characteristics, based on this Prepare the draft standard and the preparation instructions. The content of the preparation instructions is shown in Appendix C. 4.3 Method validation work The draft method standard should pass more than 6 standards of measurement or laboratory accreditation, verification of experimental conditions, monitoring capabilities and levels, Representative laboratory validation. The standard preparation team shall prepare a method verification scheme. The main contents of the verification include the method detection limit and the measurement. Limit, interlaboratory precision and accuracy. The standard preparation team summarizes, analyzes and analyzes the verification data provided by each laboratory, and evaluates the analysis method. On this basis, The method is improved, and the Method Validation Report is compiled. The content requirements are shown in Appendix D. If the technical indicators of the method do not meet the expected requirements, The standard preparation team should further improve the draft standard through research experiments, and reorganize the method verification. When the current standard is revised, if the content of the modification may affect the measurement results, the relevant content needs to be verified. If Equivalent transformation of international or foreign standards, in principle, the applicability of the method and the main technical indicators for laboratory verification. 4.4 Standards for comments, technical review, approval, and release After the standard preparation team has completed the preparation and submitted the standard consultation draft, preparation instructions and verification report, the management department will handle the standard solicitation. See the matter. After the standard preparation group summarizes the comments and modifies the draft standard, it submits the standard review draft, preparation instructions and verification report. The door organization conducts a technical review. After the standard preparation group modifies the draft standard based on the technical review opinions, submit the standard approval draft, preparation instructions and The verification report shall be submitted for approval and release by the management department. In the process of standard solicitation and technical review, if the verification data needs to be supplemented, the standard preparation team needs to arrange the verification experiment. 4.5 other The standard management department reviews the current method standards according to the needs of social and economic development and environmental supervision, and determines whether it is necessary. Make revisions. 5 basic requirements 5.1 Method standards should meet the requirements of relevant environmental quality standards and pollutant discharge (control) standards. 5.2 Method standards should be linked to environmental standards such as the relevant pollutant sampling method standards. 5.3 Method The method adopted should be stable, reliable, scientific, reasonable and practical. 5.4 Method standards are complete, accurate, easy to understand, and easy to implement. 5.5 Method standards The relevant technical documents and data are complete. 5.6 The method standard shall not stipulate the use of the technology, products and services of a specific enterprise, and the trademark name of a specific enterprise shall not appear. Use patented technologies and formulations that are not disclosed in the protection period. 5.7 The method standards shall not use reagents that are prohibited or eliminated by the state. 6 standard structural elements The structural elements of the environmental monitoring analysis method standard are shown in Table 1. Table 1 Structural elements of environmental monitoring analysis method standards No. Feature Type Corresponding Articles in this Standard 1 cover essential elements 7.1 2 Items Required 7.2 3 Preface essential elements 7.3 4 Standard Name Essentials 7.4 5 Warning Optional Elements 7.5 6 Scope of the necessary elements 7.6 7 Normative references optional elements 7.7 8 Terms and Definitions Optional Elements 7.8 9 Principles of Method Principles 7.9 10 Interference and elimination of optional elements 7.10 11 Reagents and materials essential elements 7.11 12 Instruments and equipment essential elements 7.12 13 Sample Essentials 7.13 14 Analytical Steps Essentials 7.14 15 Calculation and representation of the necessary elements 7.15 16 Precision and Accuracy Essentials 7.16 17 Uncertainty optional element 7.17 18 Quality Assurance and Quality Control Essentials 7.18 19 Test report optional elements 7.19 20 Waste Treatment Optional Elements 7.20 21 Notes Optional Elements 7.21 22 Normative Appendix Optional Elements 7.22 23 Informative Appendix Optional Elements 7.22 24 References Optional Elements 7.23 7 main technical content 7.1 cover According to the provisions of HJ 565. 7.2 Contents According to the provisions of HJ 565. 7.3 Preface According to the provisions of HJ 565. 7.4 Standard Name 7.4.1 The standard name uses a three-stage expression, that is, the environmental monitoring elements to which the analytical method standard applies, the specified components analyzed, or The name of the feature and analysis method. Example 1. Determination of dissolved oxygen in water. Electrochemical probe method Water quality-Determination of dissolved oxygen-Electrochemical probe method Example 2. Determination of ambient air ozone - Indigo disulphonate spectrophotometry Ambient air-Determination of ozone-Indigo disulphonate spectrophotometry 7.4.2 The English name of the standard should be written. 7.5 Warning Reagents involving highly toxic, flammable, explosive, corrosive, radioactive, strong volatility, etc., and Don't pay attention to safety and protection matters. 7.6 Scope of application 7.6.1 The environmental monitoring elements to which the standard applies, the name of the object being analyzed and the method of analysis should be stated. 7.6.2 The detection limit, lower limit of measurement and upper limit of measurement (if necessary) or measurement range of the object to be analyzed shall be stated. If necessary, should give no The detection limit and the lower limit of measurement corresponding to the sampling situation, different sample quantities, and different test conditions. 7.6.3 If several analytical methods are included in the standard, the scope of application of each analytical method should be clearly indicated. 7.6.4 Not included in the standard name, but need to be explained. 7.6.5 Where applicable, the inapplicability of the standard should be clarified. 7.7 Normative references 7.7.1 Normative references refer to national environmental protection standards, other national standards, industry standards and international standards cited in the standard texts. Standards, etc. The standards that have been abolished by the state are not to be quoted. 7.7.2 The lead should be in accordance with the requirements of Annex 12 of the “Administrative Measures for the Revision and Revision of National Environmental Protection Standards”. 7.7.3 The order in which the referenced documents are arranged is as specified in HJ 565. 7.8 Terms and definitions 7.8.1 The definitions necessary to understand the terms in the standard should be given. 7.8.2 Terms and definitions should be as far as possible defined in national environmental protection standards, other national standards, industry standards and international standards. 7.9 Principle of the method 7.9.1 Briefly describe the basic principles, characteristics and main steps of the method. 7.9.2 In the case of chemical reactions, chemical equations should be written in principle. If the reaction cannot be completed in one step, each step should be given in detail. Reaction equation. 7.10 Interference and elimination 7.10.1 Based on the interference experiment, the links and factors that cause interference to the method are proposed. 7.10.2 In the presence of interference, the components of the interference and their limits, as well as the degree of interference, should be stated. 7.10.3 The method and procedure for eliminating interference should be explained. If the elimination method or operation step is in “Reagents and Materials”, “Sample” or “Minutes” In the detailed description of the step, you can directly quote its clause number. 7.11 Reagents and materials 7.11.1 The following expression is generally used as a lead, “Unless otherwise stated, analytically pure reagents that meet national standards are used in the analysis. Distilled water. "When water of the grade specified in GB/T 6682 is required, the following expression is used. "Unless otherwise stated, the analysis is carried out Analytically pure reagents in accordance with national standards, water, GB/T 6682, × grade. "When phenol-free water, no carbon dioxide water, no ammonia is needed When using water for special purposes such as water and zinc-free water, the control requirements, such as the limit of phenol in "phenol-free water" and the preparation method for special-purpose water, should be indicated. 7.11.2 All reagents and materials used in the test should be listed. 7.11.3 Reagents and materials shall be serially numbered in the order. -- commercially available products (excluding solutions); -- a reference reagent; - solutions and suspensions; --standard solution; -- indicator; -- Auxiliary materials. 7.11.4 The chemical name, molecular formula, purity or purity level, concentration (content), density, and whether crystalline water, etc. of the reagent should be stated. Main characteristics, as well as the specifications and performance of the experimental materials. 7.11.5 Reagents and materials to be prepared by themselves shall be described in terms of preparation methods and environmental conditions. When necessary, the corresponding calculation formula should be given And preparation flow chart. 7.11.6 The preparation method of the standard solution and its calibration method shall be explained. 7.11.7 For the reagents and materials that need to be stored, the storage methods and conditions, storage time, precautions, etc. should be stated. 7.11.8 The expression of quantities and units carries out the provisions of HJ 565. Example. Unless otherwise stated, analytically pure reagents and distilled water in accordance with national standards were used for the analysis. 6.1 Sulfuric acid. ρ(H2SO4) = 1.84 g/ml. 6.2 Sulfuric acid solution. 19. 6.3 Sulfuric acid solution. 15. 6.4 Sulfuric acid solution. c(H2SO4) = 1 mol/L. Pour 55 ml of sulfuric acid (6.1) into a small amount of water and dilute to 1 L. 6.5 sodium hydroxide solution. ρ (NaOH) = 0.02 g/ml. Take 20 g of sodium hydroxide dissolved in a small amount of water and dilute to 1 L. 6.6 Mercuric sulfate (HgSO4) – sulfuric acid solution Weigh 30.0 g of mercury sulphate dissolved in 100 ml of sulfuric acid solution (6.2). 6.7 Silver sulfate (Ag2SO4) – sulfuric acid solution Add 10 g of silver sulfate to 1 L of sulfuric acid (6.1), let it dissolve for 1 to 2 d, mix well, and carefully shake before use. 6.8 Potassium dichromate standard solution. c (K2Cr2O7) = 0.041 7 mol/L. After drying 12.258 g of potassium dichromate at 105 ° C for 2 h, it was dissolved in water and diluted to 1 000 ml. 6.9 Sodium thiosulfate standard solution. c (Na2S2O3) ≈ 0.05 mol/L. Weigh 12.4 g of sodium thiosulfate (Na2S2O3·5H2O) dissolved in freshly boiled and capped cooling water, add 1.0 g of anhydrous sodium carbonate (Na2CO3), and transfer Into a 1 000 ml brown volumetric flask, dilute to the mark with water and shake well. The exact concentration is calibrated after one week of placement. If the solution is cloudy, it must be filtered. In a 250 ml iodine bottle, add 1.0 g of potassium iodide (KI) and 50 ml of water, add 5.00 ml of potassium dichromate standard solution (6.8), shake to complete dissolution After solution, add 5 ml of sulfuric acid solution (6.3), immediately shake it, place it in the dark for 5 min,...... ......

BASIC DATA
Standard ID HJ 168-2020 (HJ168-2020)
Description (Translated English) (Technical Guidelines for the Establishment of Environmental Monitoring Analysis Method Standards)
Sector / Industry Environmental Protection Industry Standard
Word Count Estimation 40,495
Date of Issue 2020-12-29
Date of Implementation 2021-04-01
Older Standard (superseded by this standard) HJ 168-2010
Regulation (derived from) Ministry of Ecology and Environment Announcement No. 72 (2020)

BASIC DATA
Standard ID HJ 168-2010 (HJ168-2010)
Description (Translated English) Enviromental monitoring. Technical guideline on drawing and revising analytical method standards
Sector / Industry Environmental Protection Industry Standard
Classification of Chinese Standard Z00
Classification of International Standard 13.020
Word Count Estimation 34,349
Date of Issue 2010-02-25
Date of Implementation 2010-05-01
Older Standard (superseded by this standard) HJ/T 168-2004
Quoted Standard GB/T 6379; GB/T 6682; GB/T 7714; GB/T 8170; HJ 565; JJF 1059
Drafting Organization Chinese Academy of Environmental Sciences
Administrative Organization Ministry of Environment Protection
Regulation (derived from) Department of Environmental Protection Notice No. 25 of 2010
Summary This standard specifies the environmental monitoring and analysis methods and amend standards and basic requirements of the work program, and the standard text and the relevant technical documentation made ??a requirement. This standard applies to environmental monitoring and analysis methods and revision of standards work.

BASIC DATA
Standard ID HJ/T 168-2004 (HJ/T168-2004)
Description (Translated English) Technical guideline on drawing environmental monitoring analytical method standards
Sector / Industry Environmental Protection Industry Standard (Recommended)
Classification of Chinese Standard Z10
Classification of International Standard 13.020
Word Count Estimation 38,314
Date of Issue 2004-12-09
Date of Implementation 2004-12-09
Quoted Standard GB/T 1.1; GB/T 1.2; GB/T 20001.4; GB 3100; GB 3101; GB 3102.1; GB 3102.2; GB 3102.3; GB 3102.4; GB 3102.5; GB 3102.6; GB 3102.7; GB 3102.8; GB 3102.9; GB 3102.10; GB 3102.11; GB 3102.12; ISO 5725-1; ISO 5725-2; ISO 5725-3; ISO 5725-4; ISO 5725-5; ISO 5725-6; GB 8170; GB 6379; GB 4883
Regulation (derived from) Environment and Development (2004) 169; Department of Environmental Protection Notice No. 25 of 2010