GB/T 7532-2008Determination of heavy metals in organic chemical products - Visual colorimetry (English PDF)

1 Scope

This standard specifies the test methods for heavy metals in organic chemical products was determined by visual colorimetry.

This standard applies to the content of heavy metals (Pb) was 0.1µg/mL ~ 4.0µg/mL sample.

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.

GB/T 602-2002 Chemical Reagent Determination of impurities in the preparation of standard solution used

GB/T 603-2002 Chemical Reagent Test Methods - Preparations with

Laboratory use specifications and test methods (. 1987 neq ISO 3696) GB/T 6682-1992 Analysis

Principle 3

In weak acid solution, a saturated aqueous solution of hydrogen sulfide heavy metals copper, lead, mercury and other ions precipitate as the corresponding sulfide, the resulting color

Comparison with the standard color by color visually.

4 Warning

Some test procedures prescribed test method can lead to dangerous situations, the operator should take appropriate safety and health practices.

5 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical reagents and GB/T 6682-1992 the provisions of tertiary water.

Used in the analysis of impurities determined by standard solution, preparations and products, did not indicate when the other requirements, according to GB/T 602-2002 and

GB/T 603-2002 Preparation of the provisions.

Acetic acid solution 5.1. 7 + 3;

6 Instruments

General laboratory equipment and two matching 50mL colorimetric tube.

7 Procedure