HJ 798-2016 English PDFUS$279.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. HJ 798-2016: Specifications test methods for automatic/on-line monitor of total chromium in water Status: Valid
Basic dataStandard ID: HJ 798-2016 (HJ798-2016)Description (Translated English): Specifications test methods for automatic/on-line monitor of total chromium in water Sector / Industry: Environmental Protection Industry Standard Classification of Chinese Standard: Z16 Word Count Estimation: 12,189 Date of Issue: 2016-05-04 Date of Implementation: 2016-08-01 Quoted Standard: GB 7466; GB/T 191; GB/T 6388; GB/T 9969; GB/T 13306; GB/T 13384; GB/T 15479; HJ 168; HJ 477; HJ/T 212 Regulation (derived from): Ministry of Environmental Protection Announcement No. 36 of 2016 Issuing agency(ies): Ministry of Ecology and Environment HJ 798-2016: Specifications test methods for automatic/on-line monitor of total chromium in water---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Specifications test methods for automatic/on-line monitor of total chromium in water National Environmental Protection Standard of the People 's Republic of China Technical requirements and testing methods for automatic on - line monitoring of total chromium water quality Specifications Test Methods for Automatic/On-line Monitor of Total Chromium in Water 2016-05-04 release 2016-08-01 implementation Issued by the Ministry of Environmental Protection Directory Foreword1 Scope of application2 normative reference documents3 Terms and definitions 1 4 principle and determination of the method .2 Technical requirements6 performance indicators and testing methods7 User's Manual 8 Test methods .89 inspection rules10 Marking, packaging, transportation and storageForewordIn order to implement the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Water Pollution, Water quality automatic on-line monitoring instrument technical performance, improve our ability to monitor water environment, the development of this standard. This standard specifies the technical requirements and performance indicators and testing methods of the total chromium water quality automatic on-line monitor. This standard is the first release. This standard is organized by the Ministry of Environmental Protection Science and Technology Standards Division. The main drafting of this standard. China Leather and Footwear Industry Research Institute, condenser Technology (Hangzhou) Co., Ltd., Yuxing Technology Development (Shenzhen) Co., Ltd., Lihe Technology (Hunan) Co., Ltd., Guangzhou Yiwen Environmental Technology Co. Co., Ltd., Beijing Technology and Business University. This standard is approved by the Ministry of Environmental Protection on May 4,.2016. This standard has been implemented since August 1,.2016. This standard is explained by the Ministry of Environmental Protection. Technical requirements and testing methods for automatic on - line monitoring of total chromium water quality1 Scope of applicationThis standard specifies the technical requirements, performance indicators and testing methods of the total chromium water quality automatic on-line monitor. This standard is applicable to the automatic monitoring of total chromium water quality for on-line monitoring of total chromium in domestic sewage and industrial wastewater The production design, application selection and performance testing.2 normative reference documentsThe contents of this standard refer to the following documents or their terms. Those who do not specify the date of the reference file, the effective version of the appropriate For this standard. GB 7466 Determination of total chromium in water quality GB/T 191 packaging and storage icon GB/T 6388 transport packaging collection and delivery mark General rules for the use of industrial products GB/T 9969 GB/T 13306 signs General specification for packaging of electromechanical products GB/T 13384 GB/T 15479 Industrial automation instrumentation Insulation resistance, dielectric strength Technical requirements and test methods Technical Guidelines for Standard Revision of Environmental Monitoring and Analysis Methods Technical requirements for data acquisition and transmission instrument for on - line automatic monitoring (monitoring) of pollution sources HJ/T 212 Pollution Source Online Automatic Monitoring (Monitoring) System Data Transmission Standard3 terms and definitionsThe following terms and definitions apply to this standard. 3.1 Zero drift Refers to the use of this standard in the zero calibration fluid for the sample continuous test, the instrument indicates the value of a change in a certain period of time Size relative to the range. 3.2 Range drift Refers to the use of the standard calibration fluid specified in this standard for the sample test, the instrument indicates the value of a change in a certain period of time Size relative to the range. 3.3 Memory effect The degree of influence of the instrument on the next measurement after a standard solution or water sample is measured. 3.4 Standard sample The instrument was measured before adding a certain concentration of standard solution before and after the actual water samples, calculated after adding the standard solution measured value Percentage of increase in amount relative to theoretical addition. 3.5 Environmental temperature stability The instrument measures the relative error of the standard solution, the measured value of the instrument and the reference value at different ambient temperatures. 3.6 Ion interference The instrument measures the relative error of the measured value and the true value of the standard solution with interfering ions. 3.7 Consistency conformity The degree of parallelism of the measured values of multiple instruments under the same test conditions. 3.8 Minimum maintenance period During the inspection process, do not carry out any manual maintenance (including replacement reagents, calibration instruments, etc.) of the instrument until the The instrument can not maintain the normal measurement status or the total run time (hours) of the measurement result that does not meet the relevant requirements. 3.9 Conversion rate The total chromium standard sample in the acidic high temperature timing conditions, through the strong oxidizer after the determination of hexavalent chromium content and total chromium Percentage of standard sample values.4 principle and determination of the method4.1 Principle of the method The total chromium water quality automatic on-line monitor can be spectrophotometric or other analytical methods. The principle of spectrophotometry. in the acidic solution medium, a certain temperature and pressure, the sample in different valence and The form of chromium is oxidized by potassium persulfate or potassium permanganate to hexavalent chromium. Reaction of hexavalent chromium ion with dibenzoyl hydrazine (DPC) Into the purple complex, at the wavelength of 540nm spectrophotometric determination, through the measurement of absorbance, can be indirectly The total chromium content in the water sample. The above steps are automatically controlled by the on-line monitor to complete the water sample introduction, the water sample pre-digestion and the concentration meter Count the whole process, in order to achieve the total chromium monitoring automation. 4.2 Instrument construction Pre-digestion unit. The sample to be tested, mixed acid, potassium persulfate or high manganese through a sampling device with automatic metering function Potassium and other reagents into the reaction chamber, the reagent in the reaction chamber was heated digestion, digestion after the rapid cooling. Injection/metering unit. including sample, reagent introduction part and sample, reagent metering part. Analysis unit. with the measured value into electrical signal output function, through the control unit to complete the automatic sample Online analysis. It should also include calibration for zero and span. Control unit. including system control hardware and software, with data acquisition, processing, display storage and data output and other work can. 4.3 Measuring range The measurement range of this standard is 0.04 ~ 5.00mg/L.5 technical requirements5.1 Basic requirements 5.1.1 The instrument shall identify the nameplate of the product at the point of prominence, and the contents shall include the production unit, the date of manufacture, the product number, Enclosure, power, working environment conditions and other content, should meet the requirements of GB/T 13306. 5.1.2 The display shall be free of stains and damage. All display interface should be Chinese, and the characters are uniform, clear, no dark corners of the screen, Dark spots, rainbow, bubbles, flashing and other phenomena, according to the display prompts for the whole program operation, indicating the function of the text, Number and sign correct. 5.1.3 chassis shell should be made of corrosion-resistant materials, the surface without cracks, deformation, pollution, burrs and other phenomena, the surface coating are Uniform, no corrosion, rust, shedding and wear. The product is rugged and the parts are not loose. Keys, switches, door locks and so on Control is flexible and reliable. 5.1.4 Power supply of the instrument The insulation resistance between the lead wire and the enclosure shall comply with the requirements of GB/T 15479. 5.1.5 The main parts shall have the corresponding identification or textual description. 5.1.6 The analysis flow chart should be identified in the eye-catching position of the instrument. 5.2 Functional requirements 5.2.1 Pre-digestion unit 5.2.1.1 After the oxidation reaction should be able to remove suspended solids, the impact of color. 5.2.1.2 The reaction chamber shall be heat-resistant and resistant to corrosion Material composition, the structure should be easy to stir and clean. 5.2.1.3 With automatic heating and temperature sensors, and can set the temperature and time to digest the sample. 5.2.1.4 with self Dynamic cooling device. 5.2.2 Injection/metering unit 5.2.2.1 shall be made of corrosion-resistant material and shall not affect the results of the test due to corrosion of the reagents or actual waste water. 5.2.2.2 The measurement part shall ensure the accuracy of the sample injection of the reagent and the actual waste water, and in the instruction manual, The maximum particle size of the suspended matter that can pass through the interior. 5.2.2.3 with internal pipeline self-cleaning function to prevent cross-contamination between different samples. 5.2.3 Analysis unit 5.2.3.1 shall be constructed of corrosion-resistant material and shall be easily cleaned. 5.2.3.2 Measured value The output signal should be stable. In the range specified in this standard, the performance indicators meet the requirements of Table 1. 5.2.3.3 with automatic zero and range calibration function, can set the automatic calibration cycle to ensure accurate measurement data Sex. 5.2.4 Control unit 5.2.4.1 with fault information feedback function (over range alarm, reagent margin alarm, metering component failure alarm, etc.). 5.2.4.2 data processing system should have data and run log collection, storage, processing, display and output functions, should be able to save Store at least 12 months of raw data and run the log, and have two operations management authority, the general operator can only query Corresponding log and instrument setup parameters. 5.2.4.3 Automatic standard verification and automatic calibration functions shall be provided and automatic calibration shall be performed when automatic standard verification is not carried out and The result is entered in the run log. 5.2.4.4 should have the daily calibration, parameter changes automatically record, save and query functions. 5.2.4.5 should have the function of high and low range automatic switching, the range switch does not affect the monitoring data of the normal display and signal is Often output. 5.2.4.6 should have the identification of different test data, manual maintenance. M; failure. D; check. C; standard verification. SC. 5.2.4.7 with analog and digital output interface, through the digital interface to achieve two-way communication. 5.3 Safety requirements 5.3.1 Insulation resistance Power input terminal on the chassis insulation resistance ≥ 20MΩ. 5.3.2 Dielectric strength The power phase of the phase line and the resistance of the earth can withstand AC voltage 1500V, frequency 50Hz, time 1min test, Do not appear alarm, breakdown, arcing and other phenomena.6 performance indicators and testing methods6.1 Performance indicators According to the standard method of testing, the total chromium water quality automatic on-line monitor performance indicators should meet the requirements of Table 1. Table 1 chrome water quality automatic on-line monitoring instrument performance indicators Project technical index test method Precision ≤ 5% 6.5.1 Indication error ± 5% 6.5.2 ± 5% of zero drift range 6.5.3 ± 5% of the range drift range 6.5.4 Linearity ± 5% 6.5.5 Detection limit ≤ 0.01 mg/L 6.5.6 Ambient temperature stability ± 10% 6.5.7 Voltage stability ± 5% 6.5.8 Ion interference ± 15% 6.5.9 Memory effect ± 10% 6.5.10 Standard samples were added to the experiment 80% ~ 120% 6.5.11 Actual water sample versus test ± 15% 6.5.12 Minimum maintenance cycle ≥168 hours 6.5.13 Consistency ≤10% 6.5.14 Conversion rate ≥ 90% 6.5.15 Analysis time ≤ 60min 6.5.16 6.2 Test conditions 6.2.1 Ambient temperature (5 ~ 40) ℃, the temperature change during the test should be within ± 5 ℃. 6.2.2 Relative humidity (65 ± 20)% 6.2.3 Supply voltage AC voltage (220 ± 22) V 6.2.4 Power supply frequency (50 ± 0.5) Hz 6.2.5 Water temperature (0 ~ 60) ℃ 6.2.6 pH of water samples pH. 6 ~ 9 6.2.7 Water sample suspended matter ≤ 50 mg/L 6.3 Reagents 6.3.1 Experimental water. Distilled water without chromium. 6.3.2 Zero calibration fluid. see 6.3.1. 6.3.3 hexavalent chromium standard stock solution. ρ = 100.0mg/L. Weigh 0.2829g ± 0.0001g Potassium dichromate standard reagent (K2Cr2O7) dried at 110 ℃ for 2h was dissolved in water, Dissolved and moved to 1000ml volumetric flask, add water to the standard volume, mixing. Or direct purchase of hexavalent chromium certified reference material. 6.3.4 The range calibration solution is diluted to the desired concentration of the full scale value with hexavalent chromium standard stock solution (6.3.3). 6.3.5 Range Intermediate solution Place the range calibration solution (6.3.4) with 1. 1 dilution with water (6.3.1). 6.3.6 The remaining reagents. in accordance with the total chromium water quality automatic on-line monitor manual required preparation. 6.4 Test preparation and calibration 6.4.1 Connect the power supply and run the preheat operation according to the warm-up time specified in the instrument's operating instructions so that the functions and displays The recording unit is stable. 6.4.2 In accordance with the instrument operating instructions calibration method, with zero calibration fluid (6.3.2) and range calibration fluid (6.3.4) Line total chrome water quality automatic online monitor zero calibration and range calibration operation. 6.5 Detection method 6.5.1 precision According to the test conditions (6.2), the zero calibration fluid (6.3.2) was repeated six times to indicate the average value of the value as a zero value. Under the same conditions, 20% and 80% of the range values were measured for two different concentrations of calibration fluid (6.3.4), repeat the assay Times, the relative standard deviations are calculated at each measured value (after subtracting the zero value), and the relative standard deviation is the highest. 6.5.2 Indication error According to the test conditions (6.2), two different concentrations of the range calibration solution (6.3.4) were measured at 20% and 80% of the range, Each measured 6 times, respectively, to calculate the relative error, the largest relative error as the indication error. 6.5.3 Zero drift Using zero calibration fluid (6.3.2), continuous determination of 24h. Using the initial zero value in the time (the first three measurements Value of the average), calculate the maximum change in the range relative to the percentage of the range. 6.5.4 Range drift The range calibration fluid (6.3.4) was used, and the average value was calculated three times before and after the zero drift test. use The mean value of the measured average before the zero drift test minus the percentage of the mean value measured relative to the range value after the zero drift test. 6.5.5 Straightness After zero calibration and range calibration, the range intermediate solution (6.3.5) is introduced to read the indicated value after stabilization. Calculate the The difference between the indicated value and the midpoint of the range relative to the range value. 6.5.6 detection limit According to the requirements of HJ 168, n (n ≥ 7) blank test (or blank spike) was repeated under the same analytical conditions Test), calculate the standard deviation S of the n parallel measurements. Check the limit of the calculation method see formula (1). StMDL) 99.0,1 (x = -n (1) Where. MDL - detection limit; S - standard deviation of multiple measurements of blank samples; T - degree of freedom is n - 1, confidence is 99% when the t distribution; N - the number of parallel determinations of the sample. 6.5.7 Ambient temperature stability The instrument was placed in a constant temperature room, using the range calibration fluid (6.3.4) for the detection range of the upper limit of 20% and 80% of the standard dissolved Liquid, followed by 20 ° C, 5 ° C, 20 ° C, 40 ° C and 20 ° C for 3 hours. To 20 ° C Under the three measured values of the average value of the reference value, calculate the 5 ℃, 40 ℃ under the two conditions of the first measured value and the reference value of the phase For the error, take the maximum value of the relative error as the determination of the temperature stability of the instrument. 6.5.8 Voltage stability Using the range calibration fluid (6.3.4), after the indication value is stabilized, add the power supply voltage above or below the specified voltage of 10% When reading the indicated value. The measurement was carried out three times, and the difference between the measured value and the average value with respect to the range value was calculated. The maximum value of the three calculated values is the voltage stability. 6.5.9 Ion interference Chromium industrial wastewater mainly from electroplating, tanning, printing and dyeing and chromium salt industry. Ion interference mainly consider trivalent iron, two Iron, copper, mercury, molybdenum and vanadium. A single interfering ion was added to the chromium range of 50% of the upper limit of the detection range In the positive solution (6.3.4), the interference ion concentration and the species are in accordance with Table 2 requirements. The instrument continuously measures three times of each mixed solution Calculate the average of the three measurements, taking the relative error of the measured value as the determination of the ion-to-instrument interference. Table 2 Interference ions and their concentrations Interference Ion Trivalent Iron Divalent Iron Copper Mercury Molybdenum Vanadium Interference ion concentration (Mg/L) 1.00 1.00 2.00 0.05 1.00 1.00 6.5.10 Memory effect The instrument continuously measures the concentration of 3 times the value of the upper limit of 20% of the test range (6.3.4) after the test results (test results Without any assessment), and then measure the concentration value for the detection range of the upper limit of 80% and 20% of the chromium range calibration fluid (6.3.4) 3 times, Calculate the relative error of the first measurement value of the two chromium range calibration fluid (6.3.4), and take the larger relative error as the instrument The judgment value of the memory effect. 6.5.11 standard sample to join the experiment Take the actual water sample to do the ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of HJ 798-2016_English be delivered?Answer: Upon your order, we will start to translate HJ 798-2016_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of HJ 798-2016_English with my colleagues?Answer: Yes. The purchased PDF of HJ 798-2016_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. |
