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GB/T 7570: Historical versions
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| GB/T 7570-2008 | English | 149 |
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Wool -- Determination of acid content
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| GB/T 7570-1987 | English | 199 |
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Wool--Determination of acid content
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Basic data
| Standard ID | GB/T 7570-2008 (GB/T7570-2008) |
| Description (Translated English) | Wool -- Determination of acid content |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | W04 |
| Classification of International Standard | 59.080.01 |
| Word Count Estimation | 5,555 |
| Date of Issue | 2008-04-29 |
| Date of Implementation | 2008-12-01 |
| Older Standard (superseded by this standard) | GB/T 7570-1987 |
| Quoted Standard | GB/T 601; GB/T 6682; GB/T 8170 |
| Adopted Standard | ISO 3073-1975, MOD |
| Regulation (derived from) | National Standard Approval Announcement 2008 No.6 (Total No.119) |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This standard specifies the method for determination of acid content of wool. This standard applies to undyed wool and its products, but also for the testing process does not affect the amount of dye staining products titration endpoint. |
GB/T 7570-2008: Wool -- Determination of acid content
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Wool. Determination of acid content
ICS 59.080.01
W04
National Standards of People's Republic of China
Replacing GB/T 7570-1987
Determination of acid content of wool
(ISO 3073. 1975, MOD)
Posted 2008-04-29
2008-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 3073. 1975 "Determination of acid content of wool."
This standard and ISO 3073. 1975 as compared to the main differences are as follows.
1. Added test distilled water requirements;
2. Increasing the calculation result decimal point digits requirements;
3. Modify the acid content of the formula, the concentration of Ba replaced by the symbol T, increasing the molar mass M and K values \u200b\u200bredefined;
4. Increased provisions for experimental error of the results of the request.
This standard replaces GB/T 7570-1987 "Determination of acid content of wool."
This standard compared with GB/T 7570-1987, the main changes are as follows.
1. Added test distilled water requirements;
2. Increasing the calculation result decimal point digits requirements;
3. Dry mass of said sample by a 2g to 1g;
4. Modify the formula of acid content, increasing the molar mass M and K values \u200b\u200bredefined.
The standard proposed by China Textile Industry Association.
This standard by the National Standardization Technical Committee Textile basic standards Sub-Committee (SAC/TC209/SC1) centralized.
This standard wool and linen by the Shanghai Textile Research Institute of Science and Technology is responsible for drafting.
The main drafters of this standard. Chen Jie, Yan Yan screen, Zhuqing Fang, Ping Gong, Li Zhihua.
Determination of acid content of wool
1 Scope
This standard specifies the method for determination of acid content of wool.
This standard applies to undyed wool and its products, but also applies to the testing process does not affect the amount of dye staining products titration end point.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Preparation of GB/T 601 chemical reagent standard titration solution
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)
GB/T 8170 numerical rounding rules
Principle 3
Extracting a certain quality wool with dilute acid pyridine solution, the amount of acid is extracted with sodium hydroxide standard solution titration to calculate containing
The amount of acid.
4 Reagents
In the analysis reagents used were of analytical grade and distilled water for the three water GB/T 6682 regulations.
4.1 5g/L of pyridine was added.
5g of pyridine were dissolved in distilled water and diluted to 1000mL.
4.2 standard titration solution of sodium hydroxide [Ba (NaOH) = 0.1mol/L].
According to GB/T 601 Preparation and calibration.
4.3 5g/L of phenolphthalein indicator.
0.5g of phenolphthalein is dissolved in 95% ethanol, and diluted to 100mL.
5 Instruments
5.1 plug Erlenmeyer flask. capacity 250mL.
5.2 Erlenmeyer flask. capacity 250mL.
5.3 Pipette. Capacity 50mL, 100mL.
5.4 Buret. capacity 25mL.
5.5 weighing bottle, dryer.
5.6 Analytical balance. accuracy 0.0002g.
5.7 thermostatic oven. to maintain the drying temperature 105 ℃ ± 3 ℃.
5.8 mechanical oscillator.
5.9 Glass filter crucible. Capacity 30mL ~ 50mL, pore diameter is 40μm ~ 80μm.
6 Sample preparation
6.1 Sample Preparation
Take a representative sample of not less than 10g. E.g. methylene chloride extract of the sample is greater than 1%, it should be in methylene soxhlet
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