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GB/T 24164-2020 PDF English

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GB/T 24164-2020: Determination of chlorinated benzenes in dye products
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GB/T 24164: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 24164-2020English135 Add to Cart 0-9 seconds. Auto-delivery Determination of chlorinated benzenes in dye products Valid
GB/T 24164-2009English479 Add to Cart 3 days Determination of the content of polychlorinated benzenes in dye products Obsolete

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GB/T 24164-2020: Determination of chlorinated benzenes in dye products

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.01; 87.060.10 G 55 GB/T 24164-2020 Replacing GB/T 24164-2009 Determination of chlorinated benzenes in dye products Issued on: NOVEMBER 19, 2020 Implemented on: OCTOBER 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Principle of the method... 5 4 Reagents or materials... 5 5 Instruments and equipment... 6 6 Preparation of standard solution... 6 7 Preparation of sample solution... 6 8 Test steps... 7 9 Result calculation... 8 10 Detection limit, precision and accuracy... 9 11 Test report... 9 Annex A (normative) Types of chlorinated benzenes and reference parameters for determination... 10 Annex B (informative) Chromatogram of chlorinated benzene standards... 11

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 24164-2009 “Determination of the content of polychloriznated benzenes in dye products”. Compared with GB/T 24164-2009, the main technical changes except editorial modifications are as follows. - MODIFY the scope of the standard (see Clause 1 of this Standard, Clause 1 of the 2009 edition); - DELETE the gas chromatography determination method (GC-ECD) (see Clause 4 of the 2009 edition); - MODIFY the principle of the method (see Clause 3 of this Standard, Clause 3 of the 2009 edition); - MODIFY the standard solution preparation method (see Clause 6 of this Standard, 4.3 of the 2009 edition); - MODIFY the sample solution preparation method (see Clause 7 of this Standard, 4.5.1 of the 2009 edition); - MODIFY the chromatographic analysis conditions (see 8.1 of this Standard, 4.5.2 of the 2009 version); - MODIFY the requirements for determination of method accuracy (see 10.3 of this Standard, 5.2 of the 2009 edition); - MODIFY the types of chlorinated benzenes (see Annex A of this Standard, Annex A of the 2009 version). This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Dyestuff of Standardization Administration of China (SAC/TC 134). Drafting organizations of this Standard. Jiujiang Fuda Industrial Co., Ltd., Shenyang Research Institute of Chemical Industry Co., Ltd., Jinhua Shuanghong Chemical Co., Ltd., Shaoxing Quality and Technical Supervision and Inspection Institute, China Chemical Economic and Technological Development Center, Liaoning Ecological Environmental Protection Science and Technology Center, Transfar Zhilian Co., Ltd., Shenyang SYRICI Testing Co., Ltd., National Quality Supervision and Testing Center for Dyestuff. Main drafters of this Standard. Xu Weichang, Peng Dexin, Shen Zhongyun, Lv Shuang, Zhang Guodong, Ji Lanqin, Xue Yan, Zhao Ting, Dai Baoyi, Jin Zhunian, Bao Guofang. Determination of chlorinated benzenes in dye products WARNING -- People who use this Standard shall have practical experience in regular laboratory work. This Standard does not point out all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring that the conditions specified in relevant national laws and regulations are met.

1 Scope

This Standard specifies the method for determining the residual amount of 12 kinds of chlorinated benzenes in dye products by gas chromatography-mass spectrometry (GC/MS). This Standard applies to the determination of chlorinated benzenes in various types of dye products.

2 Normative references

The 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 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values

3 Principle of the method

In an ultrasonic bath, dichloromethane is used to extract chlorinated benzene in the sample, and gas chromatography-mass spectrometry (GC/MS) is used for separation and determination, and the peak area external standard method is used for quantification. For the types of chlorinated benzene and reference parameters for determination, see Annex A.

4 Reagents or materials

4.1 Chlorinated benzene standards (see Annex A). 4.2 Dichloromethane, chromatographic grade.

5 Instruments and equipment

5.1 Gas chromatography-mass spectrometry (GC/MS). with EI source. 5.2 Chromatographic column. 50 % phenylmethylpolysiloxane stationary phase, such as DB-17MS, 30 m × 0.25 mm × 0.25μm or equivalent. 5.3 Analytical balance. accuracy of 0.01 mg. 5.4 Ultrasonic generator. 5.5 Extractor. stoppered tube, 10 mL. 5.6 Centrifuge. 4000 r/min. 5.7 Nitrogen sample concentrator.

6 Preparation of standard solution

6.1 Chlorinated benzene single standard stock solution (1000 mg/L) Weigh 10 mg (accurate to 0.01 mg) of the listed standard substances according to Annex A, dissolve them in dichloromethane and dilute to a 10 mL volumetric flask to prepare a single standard stock solution. The single standard stock solution is sealed and refrigerated at below 4 °C, away from light. The volatile components including chlorobenzene, dichlorobenzene and trichlorobenzene are valid for one week, and the validity period of other components is one month. It can also directly purchase certified standard solutions, either chlorinated benzene single standard solution or chlorinated benzene mixed standard solution. 6.2 Chlorinated benzene mixed standard working solution (50 mg/L) Pipette 0.5 mL of chlorinated benzene single standard stock solution (6.1) into a 10 mL volumetric flask and dilute to the mark with dichloromethane. 6.3 Standard working solution Use chlorinated benzene mixed standard working solution (6.2) to prepare standard working solution. The appropriate concentration can be prepared according to the content of the target substance in the sample.

7 Preparation of sample solution

7.1 General

10 Detection limit, precision and accuracy

10.1 Detection limit Prepare the sample solution according to method A in Clause 7, and the detection limit of 12 kinds of chlorinated benzenes is 0.01 mg/kg; prepare the sample solution according to method B, and the detection limit of the method is 0.05 mg/kg. 10.2 Precision The absolute difference between two independent determination results of the same object carried out in the same laboratory by the same operator using the same equipment and according to the same determination method within a short period of time shall not exceed 20 % of their average value. 10.3 Accuracy Add an appropriate amount of chlorinated benzene standard solution to 1 g of dye sample, with a spiked concentration of 1 mg/kg. Operate according to Clause 8, the recovery rate of various chlorinated benzenes determined shall be between 70 % and 110 %.

11 Test report

The test report shall at least give the following information. a) sample description; b) serial number of this Standard; c) test conditions; d) method of use; e) test results; f) deviation from the standard; g) test date. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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