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GB/T 44242-2024: Hydrogen for proton exchange membrane fuel cell vehicles - Determination of inorganic halogenated compounds and formic acid - Ion chromatography method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 44242-2024: Hydrogen for proton exchange membrane fuel cell vehicles - Determination of inorganic halogenated compounds and formic acid - Ion chromatography method---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/GBT44242-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.010 CCS F 19 Hydrogen for proton exchange membrane fuel cell vehicles - - Determination of inorganic halogenated compounds and formic acid - Ion chromatography method Issued on: JULY 24, 2024 Implemented on: NOVEMBER 01, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Principle... 5 5 Reagents and materials... 5 6 Instruments and equipment... 7 7 Test procedures... 7 8 Test data processing... 10 9 Precision... 11 10 Quality assurance and control... 12 11 Test report... 13 Annex A (informative) Ion chromatography operating conditions and eluent elution procedures, standard chromatograms and calibration curves... 14 Bibliography... 16 Hydrogen for proton exchange membrane fuel cell vehicles - - Determination of inorganic halogenated compounds and formic acid - Ion chromatography method WARNING -- Hydrogen is a flammable and explosive gas. This document does not cover all safety issues related to its application. Before using this document, the user is responsible for formulating appropriate safety and protection measures, clarifying its limited scope of application, and ensuring compliance with relevant national laws and regulations and mandatory national standards.1 ScopeThis document describes the principle, reagents and materials, instruments and equipment, test procedures, test data processing, precision, quality assurance and control, and test report for the determination of inorganic halogenated compounds and formic acid in hydrogen for proton exchange membrane fuel cell vehicles by ion chromatography. This document is applicable to the determination of inorganic halogenated compounds and formic acid in hydrogen for proton exchange membrane fuel cell vehicles. The determination of inorganic halogenated compounds and formic acid in hydrogen for other purposes shall be carried out in reference. The determination range of inorganic halogenated compounds and formic acid in hydrogen is 0.025 μmol/mol~0.5 μmol/mol. The detection limits of hydrogen chloride, chlorine, hydrogen bromide and formic acid components in hydrogen are 0.014 μmol/mol, 0.007 μmol/mol, 0.002 μmol/mol and 0.001 μmol/mol, respectively. NOTE. Inorganic halogenated compounds in this document refer to hydrogen chloride, chlorine and hydrogen bromide which may be present in hydrogen gas.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 629, Chemical reagent. Sodium hydroxide GB/T 637, Chemical reagent -- Sodium thiosulfate pentahydrate GB/T 639, Chemical reagent -- Sodium carbonate anhydrous GB/T 640, Chemical reagent -- Sodium hydrogen carbonate GB/T 6682, Water for analytical laboratory use -- Specification and test methods GB/T 14666, Terms for analytical chemistry GB/T 43306, Gas analysis -- Sampling guidelines GB/T 44262, Technical requirements for sampling of hydrogen for proton exchange membrane fuel cell vehicles JJF 1342, General Requirements for the Competence of Reference Material Producers JJG 823, Ion Chromatographs3 Terms and definitionsFor the purposes of this document, the terms and definitions defined in GB/T 14666 apply.4 PrincipleInorganic halogenated compounds and formic acid in the hydrogen sample are absorbed by the alkaline solution to generate halide ions and formate ions. They are separated by anion chromatography column and detected by conductivity detector. They are qualitatively determined by retention time and quantitatively determined by calibration curve.5 Reagents and materials5.1 Test water It shall comply with the requirements of GB/T 6682 for Grade 1 reagent water. 5.2 Reagents 5.2.1 Sodium thiosulfate pentahydrate (Na2S2O3·5H2O). in accordance with the requirements of GB/T 637 for guaranteed reagents. 5.2.2 Sodium hydroxide (NaOH). in accordance with the requirements of GB/T 629 for guaranteed reagents. 5.2.3 Sodium carbonate (Na2CO3). in accordance with the requirements of GB/T 639 for guaranteed reagents. 5.2.4 Sodium bicarbonate (NaHCO3). in accordance with the requirements of GB/T 640 for guaranteed reagents. 5.3 Solutions 5.3.1 Chloride stock solution. an aqueous solution with a chloride ion concentration of 1000 mg/L. A commercially available certified standard solution may be selected. 5.3.2 Bromide stock solution. aqueous solution with a bromide ion mass concentration of 1000 mg/L. A commercially available certified standard solution may be selected. 5.3.3 Formic acid stock solution. aqueous solution with a formate ion mass concentration of 1000 mg/L. A commercially available certified standard solution may be selected. 5.3.4 Alkaline solution. aqueous solution with NaOH and S2O32- mass concentrations of 200 mg/L and 5 mg/L respectively. Accurately weigh 0.200 g of sodium hydroxide and 0.011 g of sodium thiosulfate pentahydrate and dissolve in appropriate amount of water. Transfer to a 1000 mL volumetric flask. Add water to the set volume and mix. Prepare when needed. 5.3.5 Hydroxide eluent. generated online by an automatic eluent electrolytic generator. 5.3.6 Carbonate eluent. aqueous solution with Na2CO3 and NaHCO3 concentrations of 5.0 mmol/L and 0.2 mmol/L respectively. Accurately weigh 0.530 g of sodium carbonate and 0.017 g of sodium bicarbonate. Dissolve in an appropriate amount of water. Transfer to a 1000 mL volumetric flask. Add water to the set volume and mix well. 5.4 Gas reference materials 5.4.1 The qualifications of the research and development (production) institutions of gas reference materials shall comply with the requirements of JJF 1342.Users shall give priority to the use of certified gas reference materials. 5.4.2 Hydrogen chloride gas standard substance. hydrogen chloride content is 0.05 μmol/mol. The balance gas is nitrogen or hydrogen. It can be prepared by diluting high- concentration gas reference material with a gas diluter. 5.4.3 Formic acid gas standard substance. formic acid content is 0.1 μmol/mol. The balance gas is nitrogen or hydrogen. It can be prepared by diluting high-concentration gas reference material with a gas diluter.6 Instruments and equipment6.1 Instruments 6.1.1 Ion chromatograph. equipped with conductivity detector and anion suppressor. The main performance indicators of the conductivity detector shall meet the requirements of JJG 823.It is equipped with anion chromatographic column. The matrix is divinylbenzene/ethylvinylbenzene polymer or styrene/divinylbenzene polymer or polyvinyl alcohol. It is with quaternary ammonium functional group, or other equivalent anion chromatographic columns. The separation degree of the target ion is not less than 1.5. 6.1.2 Gas diluter. dilution ratio is 20 to 400 times. All pipeline inner walls and connecting parts must be inertized. Gas diluter shall be calibrated regularly by a qualified metrology agency. 6.1.3 Balance. the graduation value is 0.0001 g. The balance shall be calibrated regularly by a qualified metrology agency. 6.2 Equipment 6.2.1 Water purifier. water treatment equipment capable of producing water that meets the requirements of test water (5.1). 6.2.2 Connecting pipe. polytetrafluoroethylene hose or silicone rubber tube lined with polytetrafluoroethylene film. 6.2.3 Impact absorption bottle. capacity is 25 mL. Accurate to 0.1 mL. Material can be glass. Polytetrafluoroethylene material must be tested. The impact absorption bottle filled with 10 mL of water is left to stand for 4 h. The measured values of the target ions shall be less than 0.1 mg/L. 6.2.4 Flow meter. range is 1 L/min. Flow rate relative deviation is ≤ 1%. 6.2.5 Volumetric flask. capacity is 100 mL, 1000 mL. 6.2.6 Graduated pipette. capacity is 2 mL, 5 mL, 10 mL. 6.2.7 Sampling gas cylinder. comply with the requirements of GB/T 44262 and GB/T 43306.7 Test procedures7.1 Sampling The sampling of hydrogen for proton exchange membrane fuel cells shall comply with Prepare calibration samples suitable for testing the content of inorganic halogenated compounds in hydrogen not greater than 0.07 μmol/mol and the content of formic acid not greater than 0.05 μmol/mol. Pipette 1 mL of the chloride stock solution (5.3.1), bromide stock solution (5.3.2) and formic acid stock solution (5.3.3). Place them in a 100 mL volumetric flask. Add water to the set volume and mix well to obtain a mixed solution with a target ion mass concentration of 10 mg/L. Pipette 0 mL, 2 mL, 4 mL, 6 mL, 8 mL, and 10 mL of the above mixed solutions respectively. Place them in a group of 100 mL volumetric flasks. Add water to the set volume and mix well to obtain calibration samples with theoretical mass concentrations of 0 mg/L, 0.2 mg/L, 0.4 mg/L, 0.6 mg/L, 0.8 mg/L, and 1.0 mg/L, respectively. 7.2.5 Preparation of blank samples Take an impact absorption bottle from the same batch containing 10 mL of absorption liquid. Disconnect it from the gas source. Shake well for testing. 7.3 Instrument preparation Optimize the ion chromatography operating conditions and eluent elution procedure according to the composition of the sample to be tested, the instrument model and configuration. See Table A.1 in Annex A for typical ion chromatography operating conditions. See Table A.2 for typical eluent elution procedures. 7.4 Establishment of calibration curve Inject the calibration samples from low concentration to high concentration in sequence. Draw the calibration curve with the mass concentration (mg/L) of the target ion as the horizontal axis and the peak height or peak area as the vertical axis. The typical chromatogram of the target ion is shown in Figure A.1.The calibration curve of the target ion is shown in Figure A.2.The calibration curve shall be linear, with R2 ≥ 0.999. 7.5 Blank determination Inject the blank sample into the ion chromatograph. Determine the content of the target ions under the same chromatographic conditions as those used to draw the calibration curve. The measured values of the three target ions in the blank sample shall all be lower than 0.1 mg/L. 7.6 Specimen measurement Inject the sample to be tested into the ion chromatograph. Determine the target ion content under the same chromatographic conditions as those used to draw the calibration curve. When the target ion content in the sample exceeds the upper limit of the calibration curve drawing range, dilute with water and re-measure. The target ion content in the second absorption bottle shall be less than 25% of that in the first absorption bottle. The sample shall be measured within 7 d after collection. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 44242-2024 be delivered?Answer: The full copy PDF of English version of GB/T 44242-2024 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 44242-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 44242-2024_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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