GB/T 9729-2007Chemical reagent -- General method for the determination of chloride (English PDF)

Foreword

This Standard is not equivalent to ISO 6353-1.1982 Reagents for chemical

analysis - Part 1. General test methods.

This Standard replaces GB/T 9729-1988 Chemical reagent - General method

for the determination of chloride. Compared with GB/T 9729-1988, the main

change is as follows.

- Refined the determination method (Clause 5 of 1988 edition, Clause 5 of

this Standard).

This Standard was proposed by China Petroleum and Chemical Industry

Federation.

This Part shall be under the jurisdiction of the National Standardization

Technical Committee of Chemical Reagents (SAC/TC 63 / SC 3).

The drafting organization of this Standard. Guangdong Guanghua Chemical

Factory Co., Ltd.

Main drafters of this Standard. Zhang Zhibin, Lin Chuqing, and Zhang Mingchun.

This Standard was issued in 1988 for the first time.

Chemical reagent –

General method for the determination of chloride

1 Scope

This Standard specifies the general method for the determination of chloride

via visual turbidimetry.

This Standard is applicable to the determination of trace chloride in chemical

reagent. Detection range is 0.2 µg/mL ~ 4 µg/mL (in Cl).

2 Normative references

The following standards contain the provisions which, through reference in this

Standard, constitute the provisions of this Standard. For dated references, the

subsequent amendments (excluding corrections) or revisions do not apply to

this Standard. However, the parties who enter into agreement based on this

Standard are encouraged to investigate whether the latest versions of these

documents are applicable. For undated reference documents, the latest

versions apply to this Standard.

GB/T 602 Chemical Reagent - Preparations of Standard Solutions for

Impurity (GB/T 602-2002, ISO 6353-1.1982, NEQ)

GB/T 603 Chemical Reagent - Preparations of Reagent Solution for Use in

Test (GB/T 603-2002, ISO 6353-1.1982, NEQ)

GB/T 6682 Water for analytical laboratory use - Specification and test

methods (GB/T 6682-1992, neq ISO 3696.1987)

3 Principle

In hydrochloric acid medium, chlorine ions and silver ions form insoluble silver

chloride. When chlorine ion content is low, silver chloride is in suspension within

a certain time, which makes solution turbid and applicable to visual turbidimetry

of chloride.

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