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HJ 38-2017: Stationary Source Emission - Determination of Total Hydrocarbons, Methane and Nonmethane Hydrocarbons - Gas Chromatography Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid HJ 38: Historical versions
HJ 38-2017: Stationary Source Emission - Determination of Total Hydrocarbons, Methane and Nonmethane Hydrocarbons - Gas Chromatography---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HJ38-2017 HJ ENVIRONMENTAL PROTECTION INDUSTRY STANDARD Replacing HJ/T 38-1999 Stationary Source Emission - Determination of Total Hydrocarbons, Methane and Nonmethane Hydrocarbons - Gas Chromatography Issued on. DECEMBER 29, 2017 Implemented on. APRIL 1, 2018 Issued by. Ministry of Environmental Protection of the People’s Republic of China Table of ContentsAnnouncement of the Ministry of Environmental Protection of the People’s Republic of China... 3 Foreword... 5 1 Scope... 7 2 Normative References... 7 3 Terms and Definitions... 7 4 Method and Principle... 8 5 Reagents and Materials... 8 6 Instruments and Equipment... 9 7 Sample... 11 8 Analytical Procedures... 12 9 Result Calculation and Expression... 15 10 Precision and Accuracy... 16 11 Quality Assurance and Quality Control... 17 12 Precautions... 181 ScopeThis Standard specifies the gas chromatography method of determining total hydrocarbons, methane and nonmethane hydrocarbons in exhaust gas emitted from stationary sources. This Standard is applicable to the determination of total hydrocarbons, methane and nonmethane hydrocarbons in organized emission of exhaust gas from stationary sources. When the sample injection volume is 1.0 mL, the detection limits of total hydrocarbons and methane determined by this method are 0.06 mg/m3 (calculated by methane), and the lower limits are 0.24 mg/m3 (calculated by methane); the detection limit of nonmethane hydrocarbons is 0.07 mg/m3 (calculated by carbon), and the lower limit is 0.28 mg/m3 (calculated by carbon).2 Normative ReferencesThis Standard quotes the following documents or clauses in the documents. In terms of references without a specified date, the valid version applies to this Standard. GB/T 16157 The Determination of Particulates and Sampling Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source HJ 732 Emission from Stationary Sources - Sampling of Volatile Organic Compounds - Bags Method HJ/T 397 Technical Specifications for Emission Monitoring of Stationary Source3 Terms and DefinitionsThe following terms and definitions are applicable to this Standard. 3.1 Total Hydrocarbons (THC) Total hydrocarbons refer to the sum of gaseous organic compounds that respond on the hydrogen flame ionization detector of the gas chromatograph under the determination conditions specified in this Standard.4 Method and PrincipleDirectly inject gas sample into a gas chromatograph equipped with a hydrogen flame ionization detector; respectively determine the content of total hydrocarbons and methane on the total hydrocarbon column and the methane column.5 Reagents and MaterialsUnless it is otherwise specified, analytically pure chemical reagents and distilled water that meet the national standards shall be used for analysis. 5.1 De-hydrocarbon air. content of total hydrocarbons (oxygen peak included) ≤ 0.40 mg/m3 (calculated by methane); or, determine on the methane column, no other peaks except the oxygen peak. 5.3 Nitrogen. purity ≥ 99.999%. 5.4 Hydrogen. purity ≥ 99.99%. 5.5 Air. use a purification tube for air purification.6 Instruments and Equipment6.1 Sampling container. all-glass syringe, with a volume not less than 100 mL; clean and dry it, then, save it for later use. The air bag material shall comply with the relevant stipulations of HJ 732; the volume shall be not less than 1 L; before use, use de- hydrocarbon air (5.1) to clean it for at least 3 times. 6.3 Sample storage box. with light-proof function. 6.4 Gas chromatograph. equipped with hydrogen flame ionization detector. 6.5 Sample injector. an injection valve with a 1 mL sample quantitative loop, or, a 1 mL gas-tight glass syringe. 6.6 Chromatographic column 6.7 Sample heating device. the sample can be placed in it and heated to not lower than 120 °C; the temperature control accuracy is ± 5 °C.7 Sample7.1 Sample Collection 7.1.1 Collection with air bag In accordance with Figure 1, connect the sampling device. The determination of the sampling location, sampling point, sampling frequency and sampling time of exhaust gas emitted from stationary sources, as well as the determination of exhaust parameters and the sampling operations shall comply with the relevant stipulations of GB/T 16157, HJ/T 397 and HJ 732. 7.1.2 Collection with glass syringe In accordance with Figure 2, connect the sampling device. The determination of the sampling location, sampling point, sampling frequency and sampling time of exhaust gas emitted from stationary sources, as well as the determination of exhaust parameters and the sampling operations shall comply with the relevant stipulations of GB/T 16157 and HJ/T 397. 7.2 Transportation of Blank Sample Bring the sampling container filled with de-hydrocarbon air (5.1) to the sampling site. Send it back to the laboratory for analysis together with the samples collected in the same batch. 7.3 Sample Storage The glass syringe for sample collection shall be handled with care to prevent it from being damaged. Maintain the needle tip downwards and place it in the sample storage box for storage and transportation.8 Analytical Procedures8.1 Reference Conditions of Chromatographic Analysis 8.2 Calibration 8.2.1 Preparation of calibration series Take a 100 mL glass syringe (beforehand, put in a piece of rigid polytetrafluoroethylene sheet) or a 1 L air bag as a container. 8.2.2 Draw a calibration curve From low concentration to high concentration, respectively draw 1.0 mL of the calibration series (8.2.1); inject it into the gas chromatograph (6.4) to respectively determine total hydrocarbons and methane. Take the concentration of total hydrocarbons and methane (μmol/mol) as the x-coordinate; take the corresponding peak area as the y-coordinate; respectively a calibration curve of total hydrocarbons and methane. 8.2.3 Standard chromatogram Under the reference conditions (8.1) of chromatographic analysis provided in this 8.3 Sample Determination 8.3.1 Determination of total hydrocarbons and methane Take 1.0 mL of the sample to be tested. In accordance with the same operating steps and analysis conditions as the calibration curve, determine the peak area of total hydrocarbons and methane in the sample. 8.3.2 Determination of oxygen peak area Take 1.0 mL of the de-hydrocarbon air (5.1). In accordance with the same operating steps and analysis conditions as the calibration curve, determine the oxygen peak area on the total hydrocarbon column.9 Result Calculation and Expression9.1 Result Calculation The mass concentration of total hydrocarbons and methane in the sample shall be calculated in accordance with Formula (1). 9.2 Result Expression When the determined result is less than 1 mg/m3, it shall be retained to two decimal places; when the determined result is greater than or equal to 1 mg/m3, 3 significant figures shall be retained. HJ ENVIRONMENTAL PROTECTION INDUSTRY STANDARD Replacing HJ/T 38-1999 Stationary Source Emission - Determination of Total Hydrocarbons, Methane and Nonmethane Hydrocarbons - Gas Chromatography Issued on. DECEMBER 29, 2017 Implemented on. APRIL 1, 2018 Issued by. Ministry of Environmental Protection of the People’s Republic of ChinaTable of ContentsAnnouncement of the Ministry of Environmental Protection of the People’s Republic of China... 3 Foreword... 5 1 Scope... 7 2 Normative References... 7 3 Terms and Definitions... 7 4 Method and Principle... 8 5 Reagents and Materials... 8 6 Instruments and Equipment... 9 7 Sample... 11 8 Analytical Procedures... 12 9 Result Calculation and Expression... 15 10 Precision and Accuracy... 16 11 Quality Assurance and Quality Control... 17 12 Precautions... 181 ScopeThis Standard specifies the gas chromatography method of determining total hydrocarbons, methane and nonmethane hydrocarbons in exhaust gas emitted from stationary sources. This Standard is applicable to the determination of total hydrocarbons, methane and nonmethane hydrocarbons in organized emission of exhaust gas from stationary sources. When the sample injection volume is 1.0 mL, the detection limits of total hydrocarbons and methane determined by this method are 0.06 mg/m3 (calculated by methane), and the lower limits are 0.24 mg/m3 (calculated by methane); the detection limit of nonmethane hydrocarbons is 0.07 mg/m3 (calculated by carbon), and the lower limit is 0.28 mg/m3 (calculated by carbon).2 Normative ReferencesThis Standard quotes the following documents or clauses in the documents. In terms of references without a specified date, the valid version applies to this Standard. GB/T 16157 The Determination of Particulates and Sampling Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source HJ 732 Emission from Stationary Sources - Sampling of Volatile Organic Compounds - Bags Method HJ/T 397 Technical Specifications for Emission Monitoring of Stationary Source3 Terms and DefinitionsThe following terms and definitions are applicable to this Standard. 3.1 Total Hydrocarbons (THC) Total hydrocarbons refer to the sum of gaseous organic compounds that respond on the hydrogen flame ionization detector of the gas chromatograph under the determination conditions specified in this Standard.4 Method and PrincipleDirectly inject gas sample into a gas chromatograph equipped with a hydrogen flame ionization detector; respectively determine the content of total hydrocarbons and methane on the total hydrocarbon column and the methane column.5 Reagents and MaterialsUnless it is otherwise specified, analytically pure chemical reagents and distilled water that meet the national standards shall be used for analysis. 5.1 De-hydrocarbon air. content of total hydrocarbons (oxygen peak included) ≤ 0.40 mg/m3 (calculated by methane); or, determine on the methane column, no other peaks except the oxygen peak. 5.3 Nitrogen. purity ≥ 99.999%. 5.4 Hydrogen. purity ≥ 99.99%. 5.5 Air. use a purification tube for air purification.6 Instruments and Equipment6.1 Sampling container. all-glass syringe, with a volume not less than 100 mL; clean and dry it, then, save it for later use. The air bag material shall comply with the relevant stipulations of HJ 732; the volume shall be not less than 1 L; before use, use de- hydrocarbon air (5.1) to clean it for at least 3 times. 6.3 Sample storage box. with light-proof function. 6.4 Gas chromatograph. equipped with hydrogen flame ionization detector. 6.5 Sample injector. an injection valve with a 1 mL sample quantitative loop, or, a 1 mL gas-tight glass syringe. 6.6 Chromatographic column 6.7 Sample heating device. the sample can be placed in it and heated to not lower than 120 °C; the temperature control accuracy is ± 5 °C.7 Sample7.1 Sample Collection 7.1.1 Collection with air bag In accordance with Figure 1, connect the sampling device. The determination of the sampling location, sampling point, sampling frequency and sampling time of exhaust gas emitted from stationary sources, as well as the determination of exhaust parameters and the sampling operations shall comply with the relevant stipulations of GB/T 16157, HJ/T 397 and HJ 732. 7.1.2 Collection with glass syringe In accordance with Figure 2, connect the sampling device. The determination of the sampling location, sampling point, sampling frequency and sampling time of exhaust gas emitted from stationary sources, as well as the determination of exhaust parameters and the sampling operations shall comply with the relevant stipulations of GB/T 16157 and HJ/T 397. 7.2 Transportation of Blank Sample Bring the sampling container filled with de-hydrocarbon air (5.1) to the sampling site. Send it back to the laboratory for analysis together with the samples collected in the same batch. 7.3 Sample Storage The glass syringe for sample collection shall be handled with care to prevent it from being damaged. Maintain the needle tip downwards and place it in the sample storage box for storage and transportation.8 Analytical Procedures8.1 Reference Conditions of Chromatographic Analysis 8.2 Calibration 8.2.1 Preparation of calibration series Take a 100 mL glass syringe (beforehand, put in a piece of rigid polytetrafluoroethylene sheet) or a 1 L air bag as a container. 8.2.2 Draw a calibration curve From low concentration to high concentration, respectively draw 1.0 mL of the calibration series (8.2.1); inject it into the gas chromatograph (6.4) to respectively determine total hydrocarbons and methane. Take the concentration of total hydrocarbons and methane (μmol/mol) as the x-coordinate; take the corresponding peak area as the y-coordinate; respectively a calibration curve of total hydrocarbons and methane. 8.2.3 Standard chromatogram Under the reference conditions (8.1) of chromatographic analysis provided in this 8.3 Sample Determination 8.3.1 Determination of total hydrocarbons and methane Take 1.0 mL of the sample to be tested. In accordance with the same operating steps and analysis conditions as the calibration curve, determine the peak area of total hydrocarbons and methane in the sample. 8.3.2 Determination of oxygen peak area Take 1.0 mL of the de-hydrocarbon air (5.1). In accordance with the same operating steps and analysis conditions as the calibration curve, determine the oxygen peak area on the total hydrocarbon column.9 Result Calculation and Expression9.1 Result Calculation The mass concentration of total hydrocarbons and methane in the sample shall be calculated in accordance with Formula (1). 9.2 Result Expression When the determined result is less than 1 mg/m3, it shall be retained to two decimal places; when the determined result is greater than or equal to 1 mg/m3, 3 significant figures shall be retained. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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