GB/T 32612-2025 PDF English
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| GB/T 32612-2025 | English | 215 |
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Textiles - Determination of ethylene glycol ethers and related ester compounds
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| GB/T 32612-2016 | English | 179 |
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Textiles -- Determination of 2-methoxyethanol and 2-ethoxyethanol
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GB/T 32612-2025: Textiles - Determination of ethylene glycol ethers and related ester compounds---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/GBT32612-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Replacing GB/T 32612-2016
Textiles -- Determination of ethylene glycol ethers and
related ester compounds
Issued on: FEBRUARY 28, 2025
Implemented on: MARCH 01, 2027
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Principle... 5
5 Reagents and materials... 5
6 Instruments and equipment... 6
7 Test steps... 6
8 Result calculation and presentation... 7
9 Limit of quantification and precision of the method... 8
10 Test report... 8
Annex A (normative) Names and CAS numbers of 19 glycol ethers and related esters
... 10
Annex B (informative) Example of GC-MS test parameters... 11
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 32612-2016 "Textiles -- Determination of ethylene
glycol ethers and related ester compounds". Compared with GB/T 32612-2016, in
addition to structural adjustments and editorial modifications, the main technical
changes are as follows.
a) The scope of application has been changed. The substances to be tested have been
increased from 2-methoxyethanol and 2-ethoxyethanol to 19 glycol ethers and
related ester compounds (see Chapter 1 and Annex A of this Edition; Chapter 1
of Edition 2016);
b) The preparation of standard solution has been changed (see 5.3 and 5.4 of this
Edition; 3.3.1~3.3.3 of Edition 2016);
c) The specifications of extractors and filter heads have been changed (see 6.3 and
5.5 of this Edition; 4.3 and 4.4 of Edition 2016);
d) The conditions for gas chromatography-mass spectrometry analysis have been
changed (see 7.3.1 and 7.3.2 of this Edition; 5.3.1~5.3.2 of Edition 2016);
e) The result calculation and quantification limit have been changed (see 8.1 and 9.1
of this Edition; 5.3.3 and 6.1 of Edition 2016);
f) The recovery rate has been deleted (see 6.2 of Edition 2016);
g) The test report has been changed (see Chapter 10 of this Edition; Chapter 7 of
Edition 2016);
h) The names and CAS numbers of 17 glycol ethers and related ester compounds
have been added (see Annex A of this Edition).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China National Textile and Apparel Council.
This document shall be under the jurisdiction of National Technical Committee on
Textiles of Standardization Administration of China (SAC/TC 209).
The drafting organizations of this document. Fujian Fiber Inspection Center, Zhejiang
Boao New Materials Co., Ltd., Xiamen Laihe Lace Co., Ltd., China Textile Standard
Textiles -- Determination of ethylene glycol ethers and
related ester compounds
WARNING -- The personnel who use this document should have practical
experience in formal laboratory work. This document does not point out all
possible safety issues. The user is responsible for taking appropriate safety and
health measures and ensuring that the conditions stipulated by relevant national
laws and regulations are met.
1 Scope
This document describes a test method for the determination of glycol ethers and related
esters in textile products using gas chromatography-mass spectrometry.
This document applies to all types of textile products.
2 Normative references
This document has no normative references.
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
19 glycol ethers and related ester compounds in the sample are extracted with methanol
in an ultrasonic generator. The extracted solution of the sample is measured by gas
chromatography-mass spectrometry. Full scan detection is used for qualitative analysis.
Selected ions are used for quantitative analysis by external standard method.
5 Reagents and materials
Unless otherwise specified, all reagents are chromatographically pure.
5.1 Methanol. CAS No. 67-56-1.
5.2 Standard substance/standard sample. It shall comply with the provisions of Annex
A, with a purity of ≥98.0%.
5.3 Standard stock solution. Use an analytical balance (6.2) with a graduation value of
0.0001 g to weigh each standard substance/standard sample (5.2). Dissolve and make
up to the set volume with methanol (5.1). Prepare standard stock solutions with a mass
concentration of 1000 mg/L. You can also directly purchase certified standard stock
solutions. Either single component or mixed standard stock solutions can be used.
NOTE. The standard stock solution should be stored in a refrigerator at 0℃~4℃ away from light.
The validity period is 6 months.
5.4 Mixed standard working solution. Prepare according to work needs. Use methanol
(5.1) to dilute the standard stock solution step by step into a series of mixed standard
working solutions of at least 5 different mass concentrations (e.g., 0.1 mg/L, 0.2 mg/L,
0.5 mg/L, 0.8 mg/L, 1.0 mg/L, 2.5 mg/L).
NOTE. The mixed standard working solution should be stored in a refrigerator at 0℃~4℃ away
from light. The validity period is 1 month.
5.5 Organic phase needle filter. The pore size is 0.45 μm.
6 Instruments and equipment
6.1 Gas chromatograph-mass spectrometer. equipped with electron impact ionization
source (EI source).
6.2 Analytical balance. graduation value is 0.01 g and 0.0001 g.
6.3 Extractor. 30 mL, tubular hard glass extractor with screw cap (with
polytetrafluoroethylene gasket).
6.4 Ultrasonic generator. working frequency is (40±5) kHz, temperature is (45±2)℃.
7 Test steps
7.1 Specimen preparation and extraction
Take a representative sample. Cut it into pieces less than 5 mm×5 mm and mix well.
Weigh 1.0 g of the specimen, accurate to 0.01 g. Place it in an extractor (6.3). Add 10
mL of methanol (5.1) to the extractor. Tighten the lid. Place the extractor in an ultrasonic
generator (6.4). Extract in an ultrasonic water bath at (45±2)℃ for (30±1) min. After
cooling to room temperature, filter with an organic phase needle filter (5.5) to obtain
the specimen extraction solution.
7.2 Blank test solution
Except for not adding the specimen, follow the procedures in 7.1.
Where,
Xi - Content of each component in the specimen, in milligrams per kilogram (mg/kg);
ρi - Mass concentration of the component solution obtained from the standard working
curve, in milligrams per liter (mg/L);
ρ0 - Mass concentration of the blank test solution obtained from the standard working
curve, in milligrams per liter (mg/L);
V - Volume of the sample solution, in milliliters (mL);
m - Mass of the specimen, in grams (g);
f - Dilution factor.
8.2 Expression of results
The test results are expressed as the content of each target compound in the specimen.
When it is below the limit of quantification (9.1), the test result is not detected.
9 Limit of quantification and precision of the method
9.1 Limit of quantification
The limit of quantification of this method for 19 glycol ethers and related ester
compounds is 2.0 mg/kg.
9.2 Precision
The absolute difference between two independent test results obtained by the same
operator using the same equipment and the same test method in the same laboratory and
on the same object within a short period of time shall not exceed 10% of the arithmetic
mean of the two measured values, provided that the absolute difference between the
two independent test results shall not exceed 5% of the arithmetic mean of the two
measured values.
10 Test report
The test report shall at least include the following.
a) Reference to this document;
b) A detailed description of the test sample, such as the storage method before the
test and the packaging of the sample;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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