GB/T 19941-2005 in English

《GB/T 19941-2005皮革和毛皮 化学试验 甲醛含量的测定》由TC252（全国皮革工业标准化技术委员会）归口，主管部门为中国轻工业联合会。
本标准规定了皮革、毛皮产品中游离水解的甲醛含量的测定方法。本标准适用于各种皮革、毛皮产品及其制品。

This standard specifies the method for the determination of free and hydrolyzed formaldehyde content in leather and fur products.
This standard is applicable to various of leather and fur as well as their products.

1 Scope 1
2 Normative Reference 1
3 Preparation and Standardization of Formaldehyde Stock Solution 1
3.1 Reagents 1
3.2 Preparation of Formaldehyde Stock Solution 2
3.3 Calculation of Formaldehyde Stock Solution Concentration 2
4 Chromatographic Method (HPLC) 2
4.1 Principle 2
4.2 Reagents and Materials 2
4.3 Apparatus 3
4.4 Procedures 3
5 Spectrophotometric Method 5
5.1 Principle 5
5.2 Reagents and Materials 5
5.3 Apparatus 5
5.4 Procedures 6
6 Expression of Results 8
7 Test Report 9
Appendix A (Informative) Feasibility of the Test Methods 10
A.1 Reliability of the HPLC Method 10
A.2 Reliability of the Spectrophotometric Method 10
Appendix B (Informative) Comparison Between the Chapter and Article Numbers in This Standard and the One in ISO/TS 17226: 2003 11
Appendix C (Informative) Technical Differences Between this National Standard and ISO/TS 17226: 2003 and the Reasons Hereof 13