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GB/T 7573-2025: Textiles - Determination of pH of aqueous extract Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 7573: Historical versions
Similar standardsGB/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/GBT7573-2025GB 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 ContentsForeword... 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... 11ForewordThis 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 extract1 ScopeThis 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 referencesThe 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 definitionsThe 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 PrincipleThe pH value of the aqueous extract of the textile is determined at room temperature using a pH meter with a glass electrode.5 ReagentsDistilled 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 InstrumentsStoppered 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 preparationSelect representative laboratory samples from the batch of large samples, the number of which shall meet the amount required for all tests.8 Measurement stepsPrepare 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 resultsIf 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 Precision9 laboratories jointly tested 7 specimens and obtained the following results after statistical analysis.Appendix APreparation 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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