GB/T 6730.32-2013Iron ores - Determination of vanadium content - The ammonium ferrous sulfate titrimetric method (English PDF)

1 Scope

This section provides the ammonium ferrous sulfate titration method for the determination of vanadium content.

This section applies to natural iron ore, the determination of iron ore, iron ore, sinter and pellets vanadium content measurement range (mass fraction

Number). 0.100% to 1.00%.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

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 standard measurement method to repeat

Of the basic methods of reproduction

Laboratory use specifications and test methods GB/T 6682 Analysis

GB/T 6730.1 Method for analysis of chemical analysis of iron pre-dried sample preparation

GB/T 8170 repair value expressed about the rules and limit values and judgment

GB/T 10322.1 iron ore sampling and sample preparation methods

GB/T 12805 Laboratory glassware Burettes

GB/T 12806 Laboratory glassware single marking flask

GB/T 12808 Laboratory glassware single marking pipette

Principle 3

Sodium peroxide or mixed samples of molten flux, acidified with sulfuric acid, first with ferrous vanadium, chromium and other substances reducing the oxidation state, and then use high

Potassium permanganate vanadium (IV) oxide to vanadium (V), an excess of potassium permanganate in the presence of urea to nitrite reduction to N- benzene-generation anthranilic

Acid as indicator, titrated with ferrous ammonium sulfate standard solution titration, whereby the determination of vanadium content.

4 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical reagents and third grade GB/T 6682 specified above or distilled water

Deionized water or equivalent purity.