GB/T 5173-2018Surface active agents -- Detergents -- Determination of anionic-active matter content -- Direct two-phase titration procedure (English PDF)

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 5173-1995 "Surface active agents and detergents

- Determination of anionic-active matter by direct two-phase titration procedure".

Compared with GB/T 5173-1995, the main technical changes of this Standard

are as follows.

- ADD the determination of alpha-sodium alkenyl sulfonate (AOS) (see 7.2);

- Delete the selective use of ethidium bromide (see 4.8.1.3 of the 1995

edition);

- Modify the recommended sampling mass of test portion (see 7.1; 7.1 of the

1995 edition);

- Modify the constant volume of test portion (see 7.2; 7.2 of the 1995 edition);

- Modify the formulas for calculating the anionic-active matter content (see

8.1; 8.1 of the 1995 edition);

- Delete sodium lauryl sulfate (see 4.5 of the 1995 edition);

- Delete the preparation and calibration process of benzethonium chloride

and acidic mixed indicator solution; ADD reference standards (see 4.6 and

272 on Surface Active Agents and Washing Supplies of Standardization

Administration of China (SAC/TC 272).

Drafting organizations of this Standard. China Research Institute of Daily

Chemistry Co., Ltd. [China Washing Supplies Quality Supervision Inspection

Center (Taiyuan)], Zanyu Technology Group Co., Ltd., Xi'an Kaimi Co., Ltd.,

Shanxi Institute of Standardization, Shenzhen Biogmi Biotechnology Co., Ltd.

Main drafters of this Standard. Yao Chenzhi, Xue Wei, Ge Zan, Yu Wen, Duan

Pingmei, Zhao Hongmei, Guo Hongtao.

The previous editions of the standard replaced by this Standard were released

as follows.

- GB/T 5173-1985, GB/T 5173-1995.

Surface active agents - Detergents - Determination of

anionic-active matter content - Direct two-phase

titration procedure

1 Scope

This Standard specifies the direct two-phase titration procedure for

determination of anionic-active matter content of anionic surface active agents

and detergents.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are

applicable to this document. For the undated references, the latest edition

(including all the amendments) are applicable to this document.

3 Principle

In a two-phase medium of water and chloroform, in the presence of an acidic

mixed indicator solution, use a cationic surface active agent (benzethonium

chloride) to titrate, to determine anionic-active matter.

4 Reagents

Unless otherwise specified, the analysis is conducted using the confirmed

analytically pure reagents. Water is Grade III water in accordance with GB/T

6682.

5 Apparatus

General laboratory instrument and the following.

6 Preparation of samples

In accordance with the provisions of Clause 4 of GB/T 13173-2008, prepare

and store test samples.

7 Procedures

Warning — Due to the toxicity of chloroform, the corresponding operation

of direct two-phase titration shall be performed in a fume hood or a well-

ventilated environment.

8 Expression of results

For the same sample, using the same test method, in the same laboratory,

measure by the same operator using the same instrument in a short time

interval, the difference between the results of two consecutive determinations

shall not exceed 1.5% of the mean.

9 Test report

The test report shall include the following.

Appendix A

(Informative)

Technical differences between this Standard and ISO 2271.1989 and

their causes

......