GB/T 7570-2008 English PDF

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GB/T 7570-2008: Wool -- Determination of acid content
Status: Valid

GB/T 7570: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7570-2008	149	Add to Cart	2 days	Wool -- Determination of acid content	Valid
GB/T 7570-1987	199	Add to Cart	2 days	Wool--Determination of acid content	Obsolete

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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: 5,569
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Older Standard (superseded by this standard): GB/T 7570-1987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

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
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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