GB/T 3654.2-2008Ferroniobium - Determination of copper content - The neocuproine-choroform extraction photometric method (English PDF)

1 Scope

This section provides the copper with a new spirit - spectrophotometric determination of niobium content of iron in copper chloroform extraction.

This section applies to the determination of copper content of iron niobium. Measurement range (mass fraction). 0.0040% to 0.18%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 4010 alloy chemical analysis and preparation of samples

Principle 3

Sample decomposition with an acid, in the presence of citric acid, hydroxylamine hydrochloride to post a reduced copper price, the conditions under pH = 5-7, and neocuproine

Yellow copper forming insoluble complexes, extracted with chloroform, at a wavelength of 460nm spectrophotometer measured absorbance.

4 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water.

5 Instruments

Analysis using common laboratory instruments and equipment.