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GB/T 41531-2022 PDF in English


GB/T 41531-2022 (GB/T41531-2022, GBT 41531-2022, GBT41531-2022)
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GB/T 41531-2022: PDF in English (GBT 41531-2022)

GB/T 41531-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles – Determination of Phenol and Bisphenol A
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Principles ... 4
5 Reagents ... 5
6 Apparatus ... 5
7 Analysis Procedures ... 6
8 Calculation and Representation of Result ... 6
9 Quantitative Limit of Method ... 7
10 Precision ... 7
11 Test Report ... 7
Appendix A (Informative) Analysis of Liquid Chromatography of Phenol and
Bisphenol A ... 8
Textiles – Determination of Phenol and Bisphenol A
Warning: Personnel using this Document shall have practical working experience in
formal laboratory. This Document does not address all possible security issues. It is the
user's responsibility to take appropriate safety and health measures and ensure
compliance with the conditions stipulated in the relevant national laws and regulations.
1 Scope
This Document describes a method for the determination of phenol and bisphenol A in textiles
using high performance liquid chromatography.
This Document applies to all types of textile products.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
3 Terms and Definitions
For the purposes of this Document, no terms and definitions apply.
4 Principles
The specimen is ultrasonically extracted with methanol; and the extracting solution is filtered
through a filter membrane; and then the specimen is determined by a high-performance liquid
chromatograph equipped with a fluorescence detector (HPLC/FLD) or a high-performance
liquid chromatograph equipped with a diode array detector (HPLC/DAD); then conduct the
quantification by external standard method.
6.4 Glass extraction bottle: with a capacity of 40mL and a screw cap.
6.5 Polytetrafluoroethylene filter membrane: The pore size is 0.45μm.
7 Analysis Procedures
7.1 Preparation and extraction of specimens
Take a representative specimen; cut it to less than 5mm×5mm; and mix well. Take 1g from the
mixed sample, accurate to 0.01g; put the specimen in the glass extraction bottle (6.4); add 30mL
of methanol (5.2) into the glass extraction bottle (6.4); screw the cap tightly. Put the glass
extraction bottle (6.4) in an ultrasonic cleaner (6.2); extract at 35°C for (40±2) min; then cool
to room temperature; and filter the extracting solution through a polytetrafluoroethylene filter
membrane (6.5) as a sample solution for analysis by the instrument.
7.2 Standard working curve
Pipette the mixed standard working solution (5.6); and measure it with reference to the
instrument analysis conditions given in A.1 of Appendix A. Take the mass concentration of
phenol or bisphenol A as the abscissa, and the corresponding chromatographic peak area as the
ordinate, draw the working curve.
7.3 Qualitative and quantitative analysis
Qualitative analysis is carried out by comparing the retention time and spectrum of the
measured substance with the standard substance in the chromatogram; and the external standard
method is used for quantification. See A.1 for instrument analysis conditions. When the analysis
conditions of A.1 are used, the liquid chromatograms of phenol and bisphenol A are shown in
Figures A.1 and A.2.
8 Calculation and Representation of Result
Calculate the content of phenol and bisphenol A according to the formula (1), respectively, and
the calculation results are accurate to one digit after the decimal point. The test results are
represented by the content of phenol and bisphenol A, respectively.
Where:
X - the content of phenol and bisphenol A in the specimen, in mg/kg;
cs – mass concentration of phenol and bisphenol A in the sample solution obtained through the
standard working curve, in mg/L;
V – extracting solution volume of specimen, in mL;
f – dilution factor;
m – mass of specimen, in g.
9 Quantitative Limit of Method
9.1 The quantitative limit of HPLC/FLD phenol is 1.0mg/kg; and the quantitative limit of
bisphenol A is 2.0mg/kg.
9.2 The quantitative limit of HPLC/DAD phenol is 10.0mg/kg; and the quantitative limit of
bisphenol A is 10.0mg/kg.
10 Precision
At the level of confidence at 95%, at the same laboratory, the same operator uses the same
device, according to the same measurement method, and independently testing the same
measured objects in a short time. The obtained absolution difference of the two independent
test results shall be no more than 10% of the arithmetic mean.
11 Test Report
The test report should be given at least the following content:
a) Use this Document;
b) Sample source and description;
c) Types of used detectors;
d) Test results;
e) Any details that deviate from this Document;
f) Test date.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.