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HJ 872-2017 English PDF

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HJ 872-2017: Ambient air. Determination of chlorine and other hazardous air pollutants in emergency monitoring. Electrochemical sensor method
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
HJ 872-2017	English	259	Add to Cart	3 days [Need to translate]	Ambient air. Determination of chlorine and other hazardous air pollutants in emergency monitoring. Electrochemical sensor method	Valid	HJ 872-2017

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Basic data

Standard ID	HJ 872-2017 (HJ872-2017)
Description (Translated English)	Ambient air. Determination of chlorine and other hazardous air pollutants in emergency monitoring. Electrochemical sensor method
Sector / Industry	Environmental Protection Industry Standard
Classification of Chinese Standard	Z15
Classification of International Standard	13.040.20
Word Count Estimation	11,176
Date of Issue	2017-11-28
Date of Implementation	2018-01-01
Quoted Standard	HJ 589
Regulation (derived from)	Ministry of Environmental Protection Announcement 2017 No. 59
Issuing agency(ies)	Ministry of Ecology and Environment
Summary	This standard specifies the electrochemical sensor method for the determination of nine harmful gases such as chlorine, hydrogen sulfide, hydrogen chloride, carbon monoxide, hydrogen cyanide, phosgene, hydrogen fluoride, ammonia, and sulfur dioxide. This standard is a qualitative semi-quantitative method and is applicable to on-site emergency monitoring of harmful gases such as chlorine, hydrogen sulfide, hydrogen chloride, carbon monoxide, hydrogen cyanide, phosgene, hydrogen fluoride, ammonia, and sulfur dioxide in the ambient air, as well as screening, census, etc. Investigation work. See Appendix A for the common measurement range of the target.

HJ 872-2017: Ambient air. Determination of chlorine and other hazardous air pollutants in emergency monitoring. Electrochemical sensor method

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(Ambient air, chlorine and other toxic and harmful gases emergency monitoring electrochemical sensor method) People's Republic of China national environmental protection standards Ambient air, chlorine and other toxic and harmful gases Emergency monitoring electrochemical sensor method Ambient air-Determination of chlorine and other hazardous air Pollutants in emergency monitoring-Electrochemical sensor method Ministry of Environmental Protection released 2017-11-28 Posted 2018-01-01 implementation i directory Preface ... ii 1 Scope ...1 2 Normative references ...1 3 method principle ...1 4 Interference and elimination ...1 5 Reagents and materials ...1 6 Instruments and Equipment ...1 7 Preparation before sampling ...2 8 Sample Collection and Measurement ...2 9 Calculation and Expression of Results ... 3 10 Quality Assurance and Quality Control ... 3 11 Notes ... 3 Appendix A (informative) Common measurement range, method and principle, interference and elimination and precautions ... 4

Foreword

In order to implement the Law of the People's Republic of China on Environmental Protection and the Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution, protect the environment and protect people Physical health, standardize environmental air emergency monitoring work, the development of this standard. This standard specifies the determination of ambient air chlorine, hydrogen sulfide, hydrogen chloride, carbon monoxide, hydrogen cyanide, phosgene, hydrogen fluoride, ammonia and Sulfur dioxide and other 9 kinds of harmful gas electrochemical sensor method. Appendix A of this standard is an informative annex. This standard is released for the first time. This standard by the Environmental Protection Department of Environmental Monitoring Division and Science and Technology Standards Division to develop. This standard was drafted. Shenyang Environmental Monitoring Center Station, Tsinghua University. This standard was approved by the MEP on November 28,.2017. This standard since January 1,.2018 come into operation. This standard is interpreted by the MEP.

1 Ambient air chlorine and other toxic and hazardous gases emergency monitoring electrochemical sensor method

Warning. The standard gases used in this method are toxic and should be avoided from direct contact and inhalation. The standard gas used should be properly stored and used Standard gas or on-site emergency monitoring should pay attention to its own protection.

1 scope of application

This standard specifies the determination of ambient air chlorine, hydrogen sulfide, hydrogen chloride, carbon monoxide, hydrogen cyanide, phosgene, hydrogen fluoride, ammonia and Sulfur dioxide and other 9 kinds of harmful gas electrochemical sensor method. This standard is qualitative and semi-quantitative method for the ambient air chlorine, hydrogen sulfide, hydrogen chloride, carbon monoxide, hydrogen cyanide, phosgene, Hydrogen fluoride, ammonia and sulfur dioxide and other harmful gases on-site emergency monitoring, as well as screening, census and other preliminary investigations. The common measurement range of the target is shown in Appendix A.

2 Normative references

This standard references the following documents in the terms. For undated references, the effective version applies to this standard. HJ 589 emergency environmental monitoring technical specifications

3 method principle

The toxic and harmful gases in the air enter the electrochemical sensor. The electrochemical sensor utilizes the electrochemical activity of the target and oxidizes it or The original, in a certain range, produce an electrical signal proportional to the concentration of the target, so as to obtain the concentration of the target. The method of measuring the target is shown in Appendix A.

4 Interference and elimination

Dust, moisture, coexistence of the same or similar chemical properties and susceptible to oxidation or reduction of substances may target the determination of dry Disturbance, determination, according to the situation to choose to increase the corresponding pretreatment tube. Refer to Appendix A for the interference and elimination of the target.

5 Reagents and materials

5.1 Standard gas. The use of commercially available standard gas or the use of static volume ratio of mixed or dynamic volume ratio of mixed preparation. 5.2 Zero calibration gas. nitrogen (purity greater than 99.99%) or pure dry air.

6 instruments and equipment

6.1 gas detector 2 gas detector with electrochemical sensor. 6.2 Pretreatment tube Drying tube, oxidation tube and filter tube. 6.3 air bag Volume of not less than 3L, lining material should be used on the measured object of inert material. 6.4 glass syringe The volume is 100 ml, which is used when the field is not suitable for direct measurement or needs dilution of the sample.

7 Preparation before sampling

7.1 point layout According to the HJ 589 point layout. 7.2 sensor check Check whether the configuration of the sensor can meet the needs of on-site testing, is in use valid period. 7.3 gas detector inspection Check gas detector status is normal, the battery is sufficient or if the filter needs to be replaced. 7.4 air bag inspection Airtight bag should be checked before use.

8 sample collection and determination

8.1 Zero verification Instrument is turned on stable, access to zero calibration gas or relatively clean ambient air check instrument zero. 8.2 Pretreatment tube connection Moisture interference target determination of the need to connect the drying tube; dust interference target connected to the filter tube to be measured; other substances interfere with the target Material determination can be selected according to the circumstances to connect the filter tube or oxidation tube. 8.3 direct measurement In accordance with the instructions set forth in the operation method of continuous determination of gas to be measured, showing the value of stability, record the measurement results, continuous determination of 2 Times, after the measurement is finished, clean the gas circuit with zero calibration gas or relatively clean ambient air, check the zero point, and then turn off the instrument. 8.4 Indirect determination 3 When the field environment is not suitable for direct measurement, collect it with a glass syringe (6.4) and transfer the sample to an air bag (6.3) Environment determination, determination of the same manner as 8.3. Air bags used before the first flush with the scene gas 3 to 5 times. When the target concentration is too high, over Instrument range, the glass syringe can be used and the collection bag, with nitrogen or relatively clean ambient air after the sample was diluted and measured.

9 results calculated and expressed

9.1 Calculation Results When the instrument shows the value of volume concentration, according to the formula (1) converted to the standard state of mass concentration. 4.22 x (1) Where. ρ - standard state of the measured mass concentration of the target, mg/m3; x - Measured volume concentration of the test object (readings indicated on the colorimetric section of the test tube), μmol/mol; M - the molecular weight of the measured target, g/mol; 22.4 - Molar volume of gas under standard conditions, L/mol. 9.2 results indicated The result of the determination is the average of the results of two consecutive measurements, retaining a maximum of 3 significant digits. 10 Quality Assurance and Quality Control 10.1 gas detector and sensor should be stored according to the method specified in the manual, and to ensure that the sensor is used within the validity period. 10.2 gas detector should be used before zero check. 10.3 Gas detectors and sensors should be calibrated at least semi-annually or annually according to daily usage. 11 Precautions 11.1 Sensors need to work in the flowing gas, should ensure the smooth flow of the instrument gas. 11.2 For instruments equipped with a dust filter, the filter must be replaced in time to prevent dust from entering the sensor and contaminating the sensor. 11.3 Determination of chlorine, ammonia and hydrogen cyanide, should avoid the use of water trap filter tube. 11.4 The sensor can not exceed the measurement range for a long time to detect. 4 Appendix A. (Informative) Common measurement range, method principle, interference and elimination, and precautions Gas detector with electrochemical sensors common measurement range, method principle, interference and elimination, and precautions for reference. A.1 common measurement range The common measurement range of the target is shown in Table A.1. Table A.1 target common determination range No. Target Common Range (mg/m3) No. Target Common Range (mg/m3) 1 chlorine 0.003 ~ 1.6 × 104 6 phosgene 0.004 ~ 1.3 × 104 2 Hydrogen Sulfide 0.001 to 1.5 × 10 7 Hydrogen Fluoride 0.001 to 90 3 Hydrogen chloride 0.002 to 8.2 x 103 8 Ammonia 0.001 to 7.6 x 103 4 Carbon monoxide 0.01 ~ 1.3 × 105 9 Sulfur dioxide 0.003 ~ 1.1 × 105 5 Hydrogen cyanide 0.01 to 1.2 × 10 3 - - - A.2 Methodology, interference and elimination, and precautions A.2.1 chlorine A.2.1.1 Methodology Chlorine gas through the electrochemical sensor permeable membrane, diffusion into the cell, and the electrolyte reduction reaction occurs, the current, in a certain range Inside, the current is proportional to the concentration of chlorine. A.2.1.2 Interference and elimination Dust and moisture interference determination, by adding a filter tube or drying tube to eliminate interference, but it is not recommended to use the water trap tube and select the higher Pumping speed. A.2.1.3 Precautions The typical response time of chlorine detector is 30 s ~ 60 s, which can be between -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.2 Hydrogen sulfide A.2.2.1 Methodology A.2.2.1.1 hydrogen sulfide Coulometric detector Using coulometric titration principle, the gas to be measured is introduced into a titration cell filled with acidic solution of potassium bromide to make the hydrogen sulfide in the gas in the cell Electrolytic reaction occurred. Within a certain range, the electrolysis current and hydrogen sulfide instantaneous concentration of a linear relationship, which leads to hydrogen sulfide concentration, and Use the microammeter to indicate the reading. A.2.2.1.2 hydrogen sulfide gas sensor detector 5 electrode from the working electrode, the reference electrode, the electrolyte solution and breathable membrane composition. Sulfur electrode as a working electrode, Ag/AgCl electrode Or LaF3 electrode as a reference electrode. The reference electrode is filled with citrate buffer as the electrolyte. Hydrogen sulfide through the breathable membrane into the electrolyte turn Into S2- ions, at equilibrium. (B.1) Where. k1 • k2 - ionization constant. When the ionic strength and pH is constant, the electrode potential is. (B.2) Where. E0 - standard electrode potential; E - electrode potential; R - gas constant; t-- temperature, ℃; F - Faraday constant. A.2.2.2 Interference and elimination High concentrations of ammonia have a direct interference with the determination of hydrogen sulfide. A.2.2.3 Precautions Hydrogen sulfide detector usually response time of 30 s ~ 50 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.3 Hydrogen chloride A.2.3.1 Methodology When the electrochemical sensor is working, a constant potential difference is applied between the working electrode and the reference electrode by an external circuit to keep the working electrode A constant potential, when the hydrogen chloride gas through the permeable membrane sensor, diffusion into the cell, the oxidation reaction. Within a certain range, The number of electrons in the working electrode is proportional to the concentration of hydrogen chloride. A.2.3.2 Interference and elimination Dust and moisture interference determination, by adding a filter tube or drying tube to eliminate interference. Acidic substances (such as hydrogen sulfide, sulfur dioxide) coexist When it will dissolve in the mist, resulting in positive interference, the test results high. A.2.3.3 Precautions Hydrogen chloride detector usually response time of 30 s ~ 50 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.4 carbon monoxide A.2.4.1 Methodology  22 HS kk          0 22.303 log H S2 Rt EE   6A.2.4.1.1 Potentiostatic electrolysis Carbon monoxide gas into the electrochemical sensor, the working electrode and the electrode electrolysis reaction, resulting in electrolysis current, in a certain Within the range, the magnitude of the current is proportional to the concentration of carbon monoxide, and the concentration of carbon monoxide can be obtained by measuring the electrolysis current. A.2.4.1.2 Coulometric detector The measured gas into the tube containing iodine dioxide, the temperature of 150 ℃ ~ 160 ℃, carbon monoxide and iodine dioxide oxidation The original reaction of iodine, iodine gas flow into the coulomb cell platinum cathode reduction, measuring the current between the two electrodes can be obtained carbon monoxide concentration. A.2.4.2 Interference and elimination Coulometric detector for the determination of carbon monoxide, sulfur dioxide, nitrogen dioxide, ozone, ethylene and acetylene and other interference determination. Available activated carbon Removal of sulfur dioxide, nitrogen dioxide and ozone interference, with mercury sulfate removal of ethylene and acetylene interference. A.2.4.3 Precautions Carbon monoxide detector usually response time of 20 s ~ 40 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and the relative humidity Degree ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.5 Hydrogen cyanide A.2.5.1 Methodology When hydrogen cyanide gas is diffused from the gas inlet to the surface of the working electrode through the permeable membrane, oxygen is generated between the working electrode, the electrolyte and the counter electrode The reaction, resulting in electrolysis current, electrolysis current amplified by the amplifier output. In a certain concentration range, the output value and hydrogen cyanide concentration into Is proportional. A.2.5.2 Interference and elimination Dust and moisture interference determination, by adding a filter tube or drying tube to eliminate interference. A.2.5.3 Precautions Hydrogen cyanide detector usually response time of 30 s ~ 40 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.6 Phosgene A.2.6.1 Methodology Phosgene through the permeable membrane, into the electrolytic cell, oxidation reaction occurs in the electrolyte, and produce current, within a certain range, the current The size is proportional to the phosgene concentration. A.2.6.2 Precautions Phosgene detector usually response time of 30 s ~ 60 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.7 Hydrogen fluoride A.2.7.1 Methodology When hydrogen fluoride gas is diffused from the gas inlet to the surface of the working electrode through the permeable membrane, oxygen gas is generated between the working electrode, the electrolyte and the counter electrode 7 of the reaction, resulting in electrolysis current. Electrolytic current amplified by the amplifier output, in a certain range, the output value is proportional to the concentration of hydrogen fluoride. A.2.7.2 Interference and elimination Dust and moisture interference determination, by adding a filter tube or drying tube to eliminate interference. A.2.7.3 Precautions Hydrogen fluoride detector usually response time is less than 30 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.8 Ammonia A.2.8.1 Methodology The gas to be measured is diffused through the permeable membrane of the electrochemical sensor into the electrolyzer, with a constant potential above the standard oxidation potential, So that diffusion in the electrolyte absorption of ammonia react to produce the corresponding limit current I, within a certain range, the current size and ammonia concentration Is proportional to, with a quantitative relationship, namely. IαC or I = KC. By measuring the change of the limiting current, the ammonia concentration can be obtained quantitatively. A.2.8.2 Interference and elimination Hydrogen sulfide, sulfur dioxide, nitric oxide and hydrogen cyanide have a positive interference with the determination of ammonia. A.2.8.3 Precautions Ammonia gas detector usually response time of 30 s ~ 150 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe. A.2.9 Sulfur dioxide A.2.9.1 Methodology Sulfur dioxide through the permeable membrane, into the electrolytic cell, oxidation potential reaction in the working electrode, resulting in the corresponding limit diffusion current, In a certain range, the current size is proportional to the concentration of sulfur dioxide. A.2.9.2 Interference and elimination Dust, moisture, nitrogen dioxide and hydrogen cyanide interfere with the determination of sulfur dioxide. Dust or moisture can be disturbed by adding filter tubes or drying Tube removed. A.2.9.3 Precautions Sulfur dioxide detector usually response time is less than 30 s, at -20 ℃ ~ 50 ℃ (some instruments -40 ℃ ~ 70 ℃) and relative humidity ≤ 95% when used. When relative humidity is more than 90%, some instruments need to be equipped with drying pipe.

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