GB/T 223.70-2008Iron, steel and alloy - Determination of iron contents - O-phenanthroline spectrophotometric method (English PDF)

1 Scope

GB/T 223 provisions of this section using phenanthroline spectrophotometric determination of iron content.

This section applies to the mass fraction of 0.10% to 1.00% Determination of iron content in the high-temperature alloys and precision alloys.

2 Normative references

The following documents contain provisions which, through reference GB/T 223 of this text, 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 6379.1 measurement methods and results of Accuracy (trueness and precision) - Part 1. General principles and definitions

GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the weight of a standard measurement method

The basic method of refolding and reproducibility

GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method

Principle 3

After the sample is dissolved in acid with perchloric acid smoke chromium and niobium acid, zirconium acid sufficiently dehydrated, and then the ammonia precipitation of iron to nickel, chromium

And other elements separated. Ferric hydroxide dissolved in dilute hydrochloric acid. In acidic solution with ascorbic acid reduced iron bivalent. And o-ferrous

Phenanthroline generated orange complex measuring absorbance.

4 Reagents

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