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GB/T 38405.1-2025: Leather and fur - Determination of chlorinated hydrocarbons - Part 1: Short-chain chlorinated paraffins (SCCPs)
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GB/T 38405.1-2025	English	399	Add to Cart	4 days [Need to translate]	Leather and fur - Determination of chlorinated hydrocarbons - Part 1: Short-chain chlorinated paraffins (SCCPs)
GB/T 38405-2019	English	199	Add to Cart	3 days [Need to translate]	Leather and fur - Chemical tests - Determination of short-chain chlorinated paraffins

GB/T 38405.1-2025: Leather and fur - Determination of chlorinated hydrocarbons - Part 1: Short-chain chlorinated paraffins (SCCPs)

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ICS 59.140.30 CCSY46 National Standards of the People's Republic of China Replaces GB/T 38405-2019 Determination of chlorinated hydrocarbons in leather and fur Part 1.Short-chain chlorinated paraffins (SCCPs) paraffins (SCCPs), MOD] Released on December 2, 2025; to be implemented on January 1, 2027. State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 1 of GB/T 38405, "Determination of Chlorinated Hydrocarbons in Leather and Fur". GB/T 38405 has been published with the following... part. ---Part 1.Short-chain chlorinated paraffins (SCCPs); ---Part 2.Medium-chain chlorinated paraffins (MCCPs). This document supersedes GB/T 38405-2019 "Chemical Tests for Leather and Fur. Determination of Short-Chain Chlorinated Paraffins", and is consistent with GB/T 38405- Compared to.2019, aside from structural adjustments and editorial changes, the main technical changes are as follows. ---The "Principles" have been revised (see Chapter 4, Chapter 3 of the.2019 edition); ---The provisions for "test water," "dichloromethane," "nitrogen," "helium," and "methane" have been deleted (see sections 4.1, 4.3, and 4.7 of the.2019 edition). 4.9); ---The internal standard solution has been changed (see 5.3, 4.4 in the.2019 version); ---Added "concentrated sulfuric acid" (see 5.7); ---The frequency of the ultrasonic generator has been changed (see 6.3, 5.3 in the.2019 version); ---The terms "solid phase extraction system and solid phase extraction column" and "polytetrafluoroethylene filter membrane" have been removed (see sections 5.7 and 5.8 in the.2019 edition); ---Added "shaker or stirrer, or other suitable mixing device" (see 6.7); ---Added methods for removing glue and other residues from samples and regulations for testing the removal of hair from surfaces (see 7.1 and 7.2); ---Added regulations regarding extraction temperature deviation and extractant cooling (see 8.1); ---Change "washing" to "purification," and its specific operating method (see 8.2, 7.2 in the.2019 version); ---The material analysis method has been changed (see 9.1, 7.3.3 in the.2019 edition); ---Added "Measurement Interference" (see 9.3); ---The method for calculating the results has been changed (see 9.4, Chapter 8 of the.2019 edition); ---Added "Feasibility of the Method" (see Chapter 10). This document is modified to adopt ISO 18219-1.2021 "Leather – Determination of chlorinated hydrocarbons in leather – Part 1.Chromatographic determination of short-chain chlorinated hydrocarbons". Paraffin wax (SCCPs). Compared with ISO 18219-1.2021, this document has undergone many structural adjustments. A comparison of the structural numbering changes between the two documents is provided below. See Appendix A for the table. This document differs significantly from ISO 18219-1.2021.The relevant clauses are indicated in vertical margins. Single lines (|) are indicated. A summary of these technical differences and their causes can be found in Appendix B. The following editorial changes have been made to this document. ---The standard name has been changed; ---The note about SCCP standard solutions has been removed; ---A new first-level heading, "Sampling and Sample Preparation," has been added; ---The method of representing chromatographic column specifications has been changed; ---Explanations have been added for some of the letter symbols in the formulas; ---The analysis device in LC-MS has been changed; ---Added content on the principles of LC-MS analysis methods, SCCP standard working solutions, and the plotting of standard working curves; ---The pore size of the filter membrane in the LC-MS analysis method instrument and equipment has been changed. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China National Light Industry Council. This document is under the jurisdiction of the National Technical Committee on Standardization of Leather Industry (SAC/TC252). This document was drafted by. Guangzhou Inspection & Testing Certification Group Co., Ltd., Sichuan University, Coach Trading (Shanghai) Co., Ltd., and China Leather Industry Co., Ltd. Footwear Research Institute Co., Ltd., Fujian Yongjian Leather Technology Co., Ltd., and China Light Industry Inspection and Certification Co., Ltd. The main drafters of this document are. Chen Jing, Sang Jun, Lin Wei, Huang Shuya, Yuan Yubing, Chen Qingfeng, Bu Qiaoqiao, Wang Chunhua, Yang Yi, and Ren Keshuai. The release history of this document and the document it replaces is as follows. ---First published in.2019 as GB/T 38405-2019; ---This is the first revision.

Introduction

Chlorinated paraffins are chlorinated derivatives of paraffin hydrocarbons, and are complex mixtures containing thousands of chlorinated alkane isomers and diastereomers. This material, with a chlorine content typically ranging from 30% to 70%, possesses advantages such as low volatility, flame retardancy, good electrical insulation, and low cost. It can be used as a flame retardant and in polyvinyl chloride (PVC) compound. Chlorinated paraffins are ethylene-based plasticizers widely used in the production of leather, textiles, cables, hoses, rubber, and other products. Based on the length of their carbon chains, chlorinated paraffins can be classified into... These include short-chain chlorinated paraffins (SCCPs) (C10~C13), medium-chain chlorinated paraffins (MCCPs) (C14~C17), and long-chain chlorinated paraffins (LCCPs). (C18~C38). SCCPs are mainly used as leather treatment agents in the leather industry; MCPs are mainly used as fatliquoring agents in the leather industry. Flame retardants, etc.; LCCPs are generally not used in the leather industry. While chlorinated paraffins are widely used, their harmful effects are gradually being discovered. And attention. Studies have shown that chlorinated paraffins have high persistence, bioaccumulation and toxicity, and are listed in the "List of Persistent Organic Pollutants" by the State. The Stockholm Convention has added a class of compounds to the list of persistent organic pollutants, and relevant limits have been introduced both domestically and internationally. GB/T 38405 aims to provide a basis for the determination of chlorinated hydrocarbons in leather and fur, and consists of two parts. ---Part 1.Short-chain chlorinated paraffins (SCCPs). The purpose is to establish a method for determining the content of SCCPs (C10-C13) in leather and fur. Experimental methods. ---Part 2.Medium-chain chlorinated paraffins (MCCPs). The purpose is to establish a method for determining the content of MCPs (C14-C17) in leather and fur. The experimental method. SCCPs are a class of complex compounds with carbon chain lengths of 10-13.They are formulated polychloroalkylene compounds used in industrial production and are primarily used in leather. Leather and textile processing auxiliaries, etc. Studies have shown that SCCPs are highly toxic, difficult to degrade in the environment and organisms, and can accumulate in the food chain. This amplifies the virus and allows it to migrate and distribute across regions and even globally through various pathways, thereby harming the ecological environment and human health. Furthermore, its harmfulness is increasingly attracting widespread attention from the international community, and relevant domestic and international regulations and standards have set clear limits for its use. In recent years, the problem of excessive SCCPs in some domestic products has attracted great attention from relevant departments and consumers in my country, leading to the need to regulate consumer products. The limitation of SCCPs in China has become an urgent issue for various industries. Leather and fur products, as common daily consumer goods, require special attention to ensure their safety. To ensure consumer safety, the revised mandatory national standards for SCCPs (Sterile Carbonate Containing Microorganisms) will include relevant limits. Currently, my country's standards for SCCPs in leather and fur... The determination is mainly based on GB/T 38405-2019, which is a modified version of ISO 18219.2015, and is consistent with the current international standard ISO 18219-1. Significant technical differences exist in 2021 regarding the type of internal standard, extraction solution purification methods, and result evaluation. This is especially relevant considering the factors affecting leather and fur. The determination of SCCP content will soon be a supporting test method for mandatory national standards. This involves a large number of tests, and current methods are susceptible to interference. Issues such as excessive data, unstable test results, and false positives necessitate urgent revisions to improve consistency with international standards. The degree of accuracy meets the testing needs of the industry. Determination of chlorinated hydrocarbons in leather and fur Part 1.Short-chain chlorinated paraffins (SCCPs)

1 Scope

This document describes the test method for the content of short-chain chlorinated paraffins (SCCPs) (C10~C13) in leather and fur. This document applies to the determination of SCCPs content in various types of leather, fur and their products.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 39364 Sampling sites for testing the chemical, physical, mechanical and color fastness of leather (GB/T 39364-2020, ISO 2418. 2017, MOD) QB/T 1267 Sampling sites for chemical, physical and mechanical, and color fastness tests on fur QB/T 1272 Preparation of samples for chemical testing of fur QB/T 2716 Preparation of samples for chemical testing of leather

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. 4.Principles Under specified conditions, the sample was ultrasonically extracted with n-hexane. The extract was purified with sulfuric acid and then subjected to gas chromatography-electron capture negative chemistry. Analysis and determination were performed using ion source mass spectrometry (GC-ECNI-MS), with quantification using the internal standard method. If the laboratory demonstrates that liquid chromatography-mass spectrometry (LC-MC) is comparable in accuracy to GC-ECNI-MS, it can also be used; see appendix. Record C. Note. In some cases, the presence of sulfonated chlorinated paraffins and chlorinated olefins of equal chain length may interfere with the test results when determining SCCPs by GC-ECNI-MS. To mitigate potential interference, Appendix C provides an LC-MS analysis method designed to offer a better solution and eliminate false positives that may be caused by GC-ECNI-MS. 5.Reagents and Materials 5.1 Unless otherwise specified, all reagents used are of analytical grade. 5.2 n-Hexane, chromatographic grade. 5.3 Internal standard solution, lindane, CAS No.. 58-89-9, 1000 μg/mL, solvent. n-hexane. 5.4 Standard solutions of SCCPs (C10~C13, CAS No.. 85535-84-8) with different chlorine contents, 100 μg/mL, are as follows. ---SCCPs (C10~C13) contain 55.5% chlorine; ---SCCPs (C10~C13) contain 63.0% chlorine. ...