GB/T 23947.2-2009Inorganic chemicals for industrial use - General method for the determination of arsenic content - Part 2: Gutzeit method (English PDF)

1 Scope

This section GB/T 23947 specifies the general method of inorganic chemical products Determination of Arsenic --- principle Gutzeit method, safety tips, a

General provisions, reagents and materials, instruments, equipment and analytical procedures.

This method is applicable to the determination of inorganic arsenic in trace chemical products. The minimum detectable concentration of 0.25mg/kg (As).

2 Normative references

The following documents contain provisions which, through reference GB/T 23947 in this section constitute provisions of this section. For dated reference documents

Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section

Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 6682-2008 analytical laboratory use specifications and test methods (ISO 3696. 1987, MOD)

Preparation of HG/T 3696.2 inorganic chemical products, chemical analysis of impurity standard solution

Preparations of HG/T 3696.3 inorganic chemical products, chemical analysis

Principle 3

In acidic solution, As (V) reduced to As (III) with potassium iodide and stannous chloride. Plus zinc particles react with acids to produce new eco-hydrogen,

So As (III) is further reduced to arsine. When arsine gas and mercury bromide paper effect, resulting in brownish yellow arsenic and mercury compounds, arsenic can be used

Visual colorimetric method.

As3 + + 3Zn + 3H + -> AsH3 -> + 3Zn2 +

AsH3 + 2HgBr2 -> AsH (HgBr) 2 (yellow) + 2HBr

4 Safety Tips

Reagents used in this test method are toxic or corrosive, the operator must be careful! Such as water splashed on the skin should immediately

Flushing, severe cases should be treated immediately.

5 General Provisions

This part of the reagents and water, did not indicate when the other requirements, refer to three analytical reagent and GB/T 6682-2008 specified

Grade water.

Impurity standard solution, preparations and products needed to test, in the absence of other requirements specified according to HG/T 3696.2, HG/T 3696.3

Provisions prepared.

6 Reagents and materials