GB/T 19942-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 19942-2019 | English | 175 |
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Leather and fur - Chemical tests - Determination of banned azo colorants
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| GB/T 19942-2005 | English | 85 |
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Leather and fur -- Chemical tests -- Determination of banned azo colourants
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GB/T 19942-2019: Leather and fur - Chemical tests - Determination of banned azo colorants---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT19942-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.140.30
Y 46
Replacing GB/T 19942-2005
Leather and fur - Chemical tests - Determination of
banned azo colorants
(ISO 17234-1.2015, Leather - Chemical tests for the determination of
certain azo colorants in dyed leathers - Part 1.Determination of certain
aromatic amines derived from azo colorants, MOD)
Issued on. DECEMBER 31, 2019
Implemented on. JULY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Principle... 8
5 Reagents and materials... 8
6 Apparatus... 9
7 Sampling and preparation of samples... 10
8 Test procedure... 11
9 Calculation and expression of results... 12
10 Method feasibility... 13
11 Test report... 14
Annex A (Informative) Structural changes of this Standard compared with ISO
17234-1.2015... 15
Annex B (Informative) Technical differences between this Standard and ISO
17234-1.2015 and their reasons... 16
Annex C (Informative) Chromatographic analyses... 18
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 19942-2005 "Leather and fur - Chemical tests -
Determination of banned azo colourants".
Compared with GB/T 19942-2005, the main technical changes of this Standard
are as follows.
- In "Normative references", delete the year number cited to GB/T 6682; ADD
the reference to "GB/T 33392" (see Clause 2; Clause 2 of the 2005 edition);
- In "Principle" clause, delete specific test conditions; ADD the method for
determination of amine (see Clause 4; Clause 4 of the 2005 edition);
- ADD the purity requirement for methanol (see 5.2);
- ADD ethyl acetate (see 5.3);
- ADD the purity requirement and descriptive note for tert-butyl methyl ether
(see 5.4);
- ADD the requirement for the storage time after the preparation of sodium
dithionite solution (see 5.6);
- Modify the pre-heating temperature requirement for citrate buffer (see 5.11;
6.9 of the 2005 edition);
- In "Apparatus", modify the types of chromatographic analysis equipment
(see 6.12; 5.11 of the 2005 edition);
- ADD the requirements for sampling of printed and multi-color splicing
samples, and samples composed of leather and fur of different qualities
(see 7.1);
- In reductive cleavage, add the temperature range of room temperature (see
8.2);
- In the liquid-liquid extraction, add the filtration operation of the solution
before chromatographic analyses (see 8.3);
- ADD the requirement that each batch of samples be analyzed respectively
with standard working solution (see 8.5; Clause 9 of the 2005 edition);
- Adjust the chromatographic analysis parameters to Annex C; ADD liquid
chromatographic parameters (see Annex C; 10.1 of the 2005 edition);
- Modify the symbols in the calculation formula (see Clause 9; Clause 11 of
the 2005 edition);
- Adjust "Method feasibility" to Clause 10; ADD descriptions of aromatic
amines numbered 5, 6 and 22 (see Clause 10; 8.4 of the 2005 edition);
- Modify the content of test report (see Clause 11; Clause 12 of the 2005
edition).
This Standard uses the redraft law to modify and adopt ISO 17234-1.2015
"Leather - Chemical tests for the determination of certain azo colorants in dyed
leathers - Part 1.Determination of certain aromatic amines derived from azo
colorants".
Compared with ISO 17234-1.2015, this Standard has many adjustments in
structure. Annex A lists the comparison table for clause-subclause number of
this Standard and ISO 17234-1.2015.
Compared with ISO 17234-1.2015, this Standard has technical differences.
Annex B gives a list of corresponding technical differences and their reasons.
For ease of use, this Standard has also made the following editorial changes.
- CHANGE the standard name to "Leather and fur - Chemical tests -
Determination of banned azo colorants";
- Delete the example of the material model in the note of ISO 17234-1.2015
"6.5 Extraction column"; ADD the note that commodity columns can be
purchased;
- ADD a note to ISO 17234-1.2015 "7.2 Tert-butyl methyl ether";
- ADD a note "the content exceeds 30 mg/kg; then the sample is deemed to
have used banned azo colorants during processing and treatment" to 9.2;
- ADD the GC/MS total ion chromatogram of aromatic amine standard
substance to ISO 17234-1.2015, Annex A;
- Delete Annex B and Annex C in ISO 17234-1.2015.
This Standard was proposed by China National Light Industry Council.
This Standard shall be under the jurisdiction of National Technical Committee
252 on Leather Industry of Standardization Administration of China (SAC/TC
252).
Drafting organizations of this Standard. Jiaxing Fur and Footwear Industry
Research Institute, Chongqing Testing and Certification (Group) Co., Ltd., State
Center of Supervision and Test for Leather (Zhejiang), Guangzhou Quality
Supervision and Testing Institute, Jihua 3514 Leather and Footware Co., Ltd.,
Sungoal (Dongguan) Advanced Materials Tech Co., Ltd., Saturday Co., Ltd.
Main drafters of this Standard. Jiang Sujie, Zhang Li, Shen Yun, Zhong Xihao,
Huo Jianchun, Li Xiaolong, Zeng Hao, Sun Dong, Li Li, Zhao Xiangxu.
The previous editions of the standard replaced by this Standard were released
as follows.
- GB/T 19942-2005.
Leather and fur - Chemical tests - Determination of
banned azo colorants
WARNING - The personnel using this Standard shall have practical
experience in regular laboratory work. The aromatic amines are classified
as substances known to be or suspected to be human carcinogens. This
Standard does not point out all possible safety problems. It is the
responsibility of the user to take appropriate safety and health measures
and ensure compliance with the conditions of relevant national and local
laws and regulations.
1 Scope
This Standard specifies the determination method for banned azo colorants that
can release carcinogenic aromatic amines in dyed leather and fur.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-2008, ISO 3696.1987, MOD)
3 Terms and definitions
The following term and definition applies to this document.
The colorant which can cleave one or more azo groups to produce the aromatic
amines listed in Table 1.
4 Principle
PLACE the degreased sample in a closed vessel; at a certain temperature, in
a buffer of specified pH, use sodium dithionite to treat it; then extract it by liquid-
liquid extraction of kieselguhr columns. EXTRACT the aromatic amine
produced by reductive cleavage into tert-butyl methyl ether. After concentration,
use an appropriate solvent to dissolve and dilute.
5 Reagents and materials
Unless otherwise specified, the reagents used are of analytical grade; all
solutions are aqueous solutions.
6 Apparatus
Extraction column, polypropylene or glass column. Inner diameter is 25
mm~30 mm; length is 140 mm~150 mm. The end is equipped with porous
granular kieselguhr (about 20 g; lightly tap the glass column to make the
packing firm).
7 Sampling and preparation of samples
For printed and multi-color splicing samples, the various colors of leather fur
shall be considered as much as possible and tested separately. If the sample
is composed of leather and fur of different qualities, the materials of different
qualities shall be tested separately.
Leather. It shall be in accordance with the provisions of QB/T 2716.
8 Test procedure
USE a glass rod to squeeze the fiber material in the reactor as much as possible;
carefully transfer all the lysis solution to the kieselguhr extraction column (6.5);
and allow to be absorbed for 15 min.
9 Calculation and expression of results
By comparing the peak area of each aromatic amine component in the sample
solution with the standard working solution (5.12), calculate the aromatic amine
content in the sample. The calculation formula is shown in formula (1).
According to the following recognition threshold, list and report separately.
10 Method feasibility
The feasibility of the method is expressed by the recovery rate. TAKE 1.0 mL of
aromatic amine standard solution (5.12); ADD it to the reactor (6.1) containing
16 mL of preheated citrate buffer (5.11); then, perform analysis according to the
operation steps for treating samples (see 8.2 and 8.3).
11 Test report
The test report shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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