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GB/T 24167-2022: Determination of chlorinated toluenes in dye products Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 24167: Historical versions
Similar standardsGB/T 24167-2022: Determination of chlorinated toluenes in dye products---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/GBT24167-2022NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.01; 87.060.10 CCS G 55 Replacing GB/T 24167-2009 Determination of Chlorinated Toluenes in Dye Products ISSUED ON: MARCH 09, 2022 IMPLEMENTED ON: OCTOBER 01, 2022 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative Reference ... 5 3 Terms and Definitions ... 5 4 Principle of Method ... 5 5 Reagents or Materials ... 5 6 Apparatus ... 6 7 Preparation of Standard Solutions ... 6 8 Preparation of Sample Solutions ... 7 9 Test Procedures ... 7 10 Calculation of Result ... 8 11 Detection Limits, Precision and Accuracy ... 9 12 Test Report ... 9 Appendix A (Normative) Types and Measurement Parameters of Chlorinated Toluene ... 10 Appendix B (Informative) Chromatogram of Chlorinated Toluene Standard Substance ... 11 Determination of Chlorinated Toluenes in Dye Products WARNING - Persons using this document shall have practical working experience in formal laboratory. This Document does not address all possible security issues. It is the user's responsibility to take appropriate safety and health measures, and to ensure compliance with the conditions stipulated by relevant national regulations.1 ScopeThis Document specifies a method for the determination of 12 chlorinated toluene residues in dye products by gas chromatography-mass spectrometry (GC/MS). This Document applies to the determination of chlorinated toluene in various types of dye products.2 Normative ReferenceThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values3 Terms and DefinitionsThis Document does not give the terms and definitions.4 Principle of MethodIn an ultrasonic bath, the chlorinated toluene in the specimen is extracted with dichloromethane, separated and determined by gas chromatography-mass spectrometry (GC/MS), and quantified by the external standard method of peak area.5 Reagents or Materials5.1 The types and measurement parameters of chlorinated toluene standard substances shall comply with the provisions of Appendix A. 5.2 Dichloromethane, chromatographically pure.6 Apparatus6.1 Gas chromatography-mass spectrometer (GC/MS): with EI source. 6.2 Chromatographic column: 50% silicone oil stationary phase, such as DB-17MS, 30m×0.25mm×0.25μm or equivalent. 6.3 Analytical balance: accuracy 0.01mg. 6.4 Ultrasonic generator. 6.5 Extractor: tube with stopper, 10mL. 6.6 Centrifuge: 4000r/min. 6.7 Nitrogen blowing concentrator.7 Preparation of Standard Solutions7.1 Chlorinated toluene single standard stock solution Respectively take 10mg of the standard substances listed in Appendix A, accurate to 0.01mg; dissolve with dichloromethane and make constant volume to a 10mL volumetric flask to prepare a single standard stock solution containing 1000mg/L of chlorinated toluene. The single standard stock solution shall be kept under 4 ℃ and protected from light, sealed and refrigerated; and the validity period is one month. Also certified standard solutions, such as single- component chlorinated toluene standard solutions or chlorinated toluene mixed standard solutions can be directly purchased. 7.2 Chlorinated toluene mixed standard working solution Pipette 0.5mL of each single standard stock solutions of chlorinated toluene (see 7.1) to 10mL volumetric flasks; dilute to the mark with dichloromethane; and prepare a standard working solution containing 50mg/L of chlorinated toluene. 7.3 Standard working solutions Use chlorinated toluene mixed standard working solution (see 7.2) to prepare the standard working solution; and the appropriate concentration can be prepared according to the content of the target substance in the specimen. m - the mass value of the specimen, in g. The calculation result is rounded-off to two digits after the decimal point. The calculation results are rounded-off according to the provisions of GB/T 8170-2008.11 Detection Limits, Precision and Accuracy11.1 Detection limit When using the Method-I in Clause 8 to prepare sample solution, the detection limit of 12 chlorinated toluenes shall be 0.5mg/kg. When using the Method-II to prepare the sample solution, the detection limit is 2.5mg/kg. 11.2 Precision In the same laboratory, the absolute difference between two independent measurement results obtained by the same operator using the same equipment, according to the same measurement method, and independently of each other on the same measured object in a short period of time is no greater than 20% of the arithmetic mean of the two determination results. 11.3 Accuracy Use the standard addition method, add an appropriate amount of chlorinated toluene standard solution to 1g of dye specimen; and the concentration of the standard addition is 10mg/kg. Operate according to the provisions of Clause 8; and the measured recovery rate of various chlorinated toluenes shall be 70% ~120%.12 Test ReportThe test report shall at least give the following: a) description of the specimen; b) this Document number; c) test conditions; d) test results; e) deviations from the standard; f) Test date. ......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 24167-2022 be delivered?Answer: The full copy PDF of English version of GB/T 24167-2022 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 24167-2022_English with my colleagues?Answer: Yes. 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