GB/T 38402-2019Leather and fur - Chemical tests - Determination of chromium (VI) content: Chromatographic method (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the redrafting method to modify and adopt ISO 17075-2..2017 "Chemical Determination of Hexavalent Chromium Content in Leather

Section. Chromatography.

Compared with ISO 17075-2..2017, this standard has more structural adjustments.Appendix A gives this standard and ISO 17075-2..2017.

List of chapter number comparisons.

There are technical differences between this standard and ISO 17075-2..2017.Appendix B gives the corresponding technical differences and their causes.

List.

This standard also makes the following editorial changes.

--- The standard name was revised to `` Determination of hexavalent chromium content in leather and fur chemical tests. chromatography '';

--- Modified the column models and specifications in Appendix B and Appendix C of ISO 17075-2..2017, and the instrument parameters have been changed accordingly.

Adjustment;

--- Change the verification data in Annex A of ISO 17075-2..2017 to the verification results of domestic laboratories;

--- Modify the test data in ISO 17075-2..2017 Appendix D to laboratory test data in China.

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).

Drafting organizations of this standard. Guangzhou Spectrum Linsheng Technology Co., Ltd., Beijing Xianming Leshi Technology Development Co., Ltd., Guangzhou Inspection and Certification

Group Co., Ltd., China Leather Shoes Research Institute Co., Ltd., Fengan Leather Industry Co., Ltd., Zhejiang Shenghui Chemical Co., Ltd., Jiangxi Long

China Leather Co., Ltd., Shengguo (Dongguan) New Material Technology Co., Ltd., Guangzhou Panyu Vocational and Technical College, Shaanxi University of Science and Technology.

1 Scope

This standard specifies a method for the determination of hexavalent chromium in leather and fur by chromatography.

This standard applies to the determination of hexavalent chromium in various types of leather, fur 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 (GB/T 6682-2008, ISO 3696. 1987, MOD)

GB/T 22807 Determination of hexavalent chromium in leather and fur chemical tests. spectrophotometric method (GB/T 22807-2019,

(ISO 17075-1..2017, MOD)

QB/T 1267 Sampling site for fur chemical, physical and mechanical, color fastness test (QB/T 1267-2012, ISO 2418.

2002, MOD)

Preparation of QB/T 1272 fur chemical test samples (QB/T 1272-2012, ISO 4044..2008, MOD)

QB/T 1273 Determination of volatiles in fur chemical test (QB/T 1273-2012, ISO 4684..2005, MOD)

QB/T 2706 Leather chemical, physical, mechanical and color fastness test samples (QB/T 2706-2005, ISO 2418.

2002, MOD)

QB/T 2716 Preparation of leather chemical test samples (QB/T 2716-2018, ISO 4044..2008, MOD)

QB/T 2717 Determination of volatiles in leather chemical test (QB/T 2717-2018, ISO 4684..2005, MOD)

3 Principle

Soluble hexavalent chromium in the sample was extracted with phosphate buffer solution, and filtered with ion exchange color with UV-VIS or DAD detector

Spectrophotometric determination of hexavalent chromium in the extract.

4 Reagents and materials

Unless otherwise stated, all reagents used are analytical grade.