Standard No.:	GB/T 19941.2-2019
Chinese Name:	皮革和毛皮 甲醛含量的测定 第2部分：分光光度法
English Name:	Leather and fur—Determination of formaldehyde content—Part 2:Colorimetric method
Professional Classification:	Y46 Furs and leathers
ICS Classification:	59.140.30 Leather and furs
Issued by:
Issued on:	2019-12-31
Implemented on:	2020-07-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	180 (USD)
Delivery:	via email in 1-3 business day

Leather and fur - Determination of formaldehyde content - Part 2: Colorimetric method

1 Scope

This part of GB/T 19941 specifies a colorimetric method for the determination of free and hydrolyzed formaldehyde content in leathers and furs.

This standard is applicable to the determination of formaldehyde contents in various leathers, furs and their 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 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696: 1987, MOD)
GB/T 19941.1 Leather and fur - Determination of formaldehyde content - Part 1: High performance liquid chromatography method (GB/T 19941.2-2019, ISO 17226-1: 2018, MOD)
QB/T 1267 Fur - Chemical, physical and mechanical and fastness tests - Sampling location (QB/T 1267-2012, ISO 2418: 2002, MOD)
QB/T 1272 Fur - Preparation of chemical test samples (QB/T 1272-2012, ISO 4044: 2008, MOD)
QB/T 1273 Fur - Chemical tests - Determination of volatile matter (QB/T 1273-2012, ISO 4684: 2005, MOD)
QB/T 2706 Leather - Chemical, physical and mechanical and fastness tests - Sampling location (QB/T 2706-2005, ISO 2418: 2002, MOD)
QB/T 2716 Leather - Preparation of chemical test samples (QB/T 2716-2018, ISO 4044: 2008, MOD)
QB/T 2717 Leather - Chemical tests - Determination of volatile matter (QB/T 2717-2018, ISO 4684: 2005, MOD)

3 Principle

The specimen is extracted with an extraction solution under specified conditions, and the obtained extraction solution is mixed with acetylacetone, whereby formaldehyde reacts to give a yellow compound (3,5-diacetyl-1,4-dihydrolutidine). The absorbance of this compound is measured at the specified wavelength, and the formaldehyde content in the specimen is calculated.

Note 1: The determination result of this method is taken to be the quantity of free and hydrolyzed formaldehyde extracted from the leather under standard conditions.