GB/T 7573-2025 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 7573-2025 | English | 170 |
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Textiles - Determination of pH of aqueous extract
| Valid |
| GB/T 7573-2009 | English | 70 |
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Textiles -- Determination of pH of aqueous extract
| Valid |
| GB/T 7573-2002 | English | 239 |
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Textiles -- Determination of pH of the aqueous extract
| Obsolete |
| GB/T 7573-1987 | English | 199 |
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Textiles--Determination of PH of the aqueous extract
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GB/T 7573-2025: Textiles - Determination of pH of aqueous extract---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/GBT7573-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Replacing GB/T 7573-2009
Textiles - Determination of pH of aqueous extract
(ISO 3071.2020, MOD)
Issued on. FEBRUARY 28, 2025
Implemented on. MARCH 01, 2027
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Principle... 6
5 Reagents... 6
6 Instruments... 7
7 Specimen preparation... 7
8 Measurement steps... 8
9 Calculation and expression of results... 8
10 Precision... 9
11 Test report... 9
Appendix A (Informative) Preparation of standard buffer solution... 10
References... 11
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 7573-2009 " Textiles - Determination of pH of aqueous
extract". Compared with GB/T 7573-2009, in addition to structural adjustments and
editorial changes, the main technical changes are as follows.
- ADD examples of various textile products "(such as fibers, yarns, fabrics, down
and other fillings)" (see Chapter 1);
- ADD "or directly purchased" (see 5.3);
- DELETE "filled with distilled water when not in use, the same below." (see 6.1 of
the 2009 edition);
- DELETE "6.5 measuring cylinder. 100 mL, chemically stable" (see 6.5 of the 2009
edition);
- CHANGE "measurement accuracy of at least 0.1" to "resolution of at least 0.01 pH
unit" (see 6.5; 6.6 of the 2009 edition);
- ADD "thermometer" (see 6.8);
- ADD the size requirement "or a size that allows the sample to be wetted quickly"
(see 7.1);
- CHANGE "avoid contamination and direct contact with the sample by hand" into
that "avoid contamination of the specimen during specimen preparation";
CHANGE "prepare 3 parallel samples for each test sample" to "prepare 2
specimens for each test sample" (see 7.2; 7.2 of the 2009 edition);
- CHANGE "100 mL of water (5.1) or potassium chloride solution (5.2)" into "100
mL of potassium chloride (KCl) solution (5.2)" (see 8.1; 8.1 of the 2009 edition);
- ADD "If an electrode without temperature compensation is used, use a thermometer
(6.8) to measure and record the temperature of the extract"; CHANGE the three
parallel samples in the test process to 2 specimens. (See 8.2; 8.2 of the 2009 edition);
- DELETE "Using water (5.1) as the extraction medium. Reproducibility limit R =
1.7 pH units." (See Chapter 10 of the 2009 edition);
- DELETE "Extraction medium used (water or potassium chloride solution)" [See
Chapter 11 d) of the 2009 edition].
This document modifies and adopts ISO 3071.2020 "Textiles - Determination of pH of
aqueous extract".
The technical differences between this document and ISO 3071.2020 and their reasons
are as follows.
- ADD the example of "filling materials such as down" to the Scope (see Chapter 1;
Chapter 1 of ISO 3071.2020) for easy understanding;
- USE the normative reference GB/T 6682 to replace the informative reference ISO
3696 (see 5.1; 5.1 of ISO 3071.2020) for easy understanding;
- CHANGE the frequency of the mechanical oscillator from "is suitable" to "at least"
(see 6.2; 6.2 of ISO 3071.2020) for easy understanding;
- ADD the thermometer (see 6.8) for easy operation;
- CHANGE that "The pH meter is calibrated with two buffer solutions at the
temperature of the extract" into that "The pH meter is calibrated with two or three
buffer solutions at the temperature of the extract" (see 8.2; 8.2 of ISO 3071.2020),
for easy operation;
- ADD "b) Sample description" to the test report for easier understanding (see
Chapter 11).
Please note that some of the contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by the China National Textile and Apparel Council.
This document shall be under the jurisdiction of the National Technical Committee for
Textile Standardization (SAC/TC 209).
The previous versions of this document and the documents it replaces are as follows.
- It was first published in 1987 as GB/T 7573-1987.It was first revised in 2002.It
was second revised in 2009;
- This is the third revision.
Textiles - Determination of pH of aqueous extract
1 Scope
This document describes the method for determining the pH value of aqueous extracts
of textiles.
This document is applicable to various textile products (such as fibers, yarns, fabrics,
down and other fillings).
2 Normative references
The contents of the following documents constitute the essential terms of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies 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 terms and definitions apply to this document.
3.1
pH value
The negative logarithm of the hydrogen ion concentration in the aqueous extract.
4 Principle
The pH value of the aqueous extract of the textile is determined at room temperature
using a pH meter with a glass electrode.
5 Reagents
Distilled or deionized water, at least meeting the requirements of GB/T 6682 Grade
3 water, with a pH value within 5.0 ~ 7.5.
6 Instruments
Stoppered glass or polypropylene flask. 250 mL, chemically resistant.
Mechanical oscillator. Capable of rotating or reciprocating to ensure sufficient
liquid exchange between the sample and the extract, with a reciprocating rate of at least
60 times/min and a rotary rate of at least 30 cycles/min.
7 Specimen preparation
Select representative laboratory samples from the batch of large samples, the
number of which shall meet the amount required for all tests.
8 Measurement steps
Prepare the extracts of two specimens at room temperature. Add one set of specimen to
a stoppered flask (6.1); measure 100 mL of potassium chloride (KCl) solution (5.2);
cover the flask tightly; shake it for a while to make the sample completely wet. Place
the flask on a mechanical oscillator (6.2) and oscillate for 2 h ± 5 min.
9 Calculation and expression of results
If the difference between two pH measurement values (accurate to 0.1) is greater than
0.2 pH units, take another specimen and retest until two valid measurement values are
obtained; calculate their average value; retain one decimal place.
10 Precision
9 laboratories jointly tested 7 specimens and obtained the following results after
statistical analysis.
Appendix A
Preparation of standard buffer solution
All reagents are analytically pure. The water used to prepare the buffer solution must at
least meet the requirements of GB/T 6682 Grade 3 water; it shall be replaced at least
once a month.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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