GB/T 38401-2019 English PDF

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GB/T 38401-2019: Leather and fur - Chemical tests - Determination of dimethyl formamide content
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
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Basic data

Standard ID: GB/T 38401-2019 (GB/T38401-2019)
Description (Translated English): Leather and fur - Chemical tests - Determination of dimethyl formamide content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y46
Classification of International Standard: 59.140.30
Word Count Estimation: 10,152
Date of Issue: 2019-12-31
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38401-2019: Leather and fur - Chemical tests - Determination of dimethyl formamide content

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Leather and fur--Chemical tests--Determination of dimethyl formamide content ICS 59.140.30 Y46 National Standards of People's Republic of China Leather and fur chemical tests Determination of dimethylformamide content 2019-12-31 release 2020-07-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Leather Industry Standardization Technical Committee (SAC/TC252). This standard was drafted. National Leather Quality Supervision and Inspection Center (Zhejiang), Zhejiang Tongtianxing Group Co., Ltd., Jiaxing College, Jia Xingshi Bag Industry Association, Zhejiang Shenghui Chemical Co., Ltd., China Leather Shoes Research Institute Co., Ltd., Guangdong Xinhuwei Industrial Investment Co., Ltd. the company. The main drafters of this standard. Sun Xia, Xu Xiangjin, Ma Hewei, Sun Dong, Bu Qiaoqiao, Zhu Anfu, Shi Jihong, Jiang Deyun, Zheng Jiantang. Leather and fur chemical tests Determination of dimethylformamide content

1 Scope

This standard specifies the gas chromatography-mass spectrometry method for dimethylformamide content in leather, fur and its products. This standard applies to the determination of dimethylformamide in various leathers, furs and their products.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 6682 Analytical laboratory water specifications and test methods QB/T 1267 Sampling site for fur chemical, physical and mechanical, color fastness test QB/T 1272 Preparation of fur chemical test samples QB/T 1273 Determination of volatile matter in fur chemical test QB/T 2706 Sampling site for leather chemical, physical, mechanical and color fastness tests QB/T 2716 Preparation of leather chemical test samples QB/T 2717 Determination of volatiles in leather chemical test

3 Principle

Under the action of ultrasound, the dimethylformamide in the sample was extracted with methanol, and the extract was filtered and purified through a membrane. Determination by spectrum-mass spectrometry, quantification by external standard method.

4 Reagents and materials

4.1 General requirements. Unless otherwise specified, the reagents used are analytical grade, and the test water should meet the requirements of Grade III water in GB/T 6682. 4.2 Methanol. chromatographically pure. 4.3 Dimethylformamide Standard (CASNo .. 68-12-2). Purity ≥99.5%, see Appendix A. 4.4 Standard stock solution. Weigh an appropriate amount of dimethylformamide standard and prepare it with methanol (4.2) to a standard concentration of 100 μg/mL. Quasi-stock solution. 4.5 Standard working solution. Dilute the standard stock solution (4.4) with methanol (4.2) to a standard working solution of appropriate concentration as needed.

5 Instruments and equipment

5.1 Analytical balance. The accuracy is 0.1mg. 5.2 Ultrasonic generator. There is temperature control device. 5.3 Sealable extraction bottle. 100mL. 5.4 Organic filter. 0.45 μm. ......

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