GB/T 6730.21-2016Iron ores - Determination of manganse content - Potassium periodate spectrophotometric method (English PDF)

1 Scope

This part of GB/T 6730 specifies the potassium iodide spectrophotometric method for the determination of manganese content.

This part is applicable to the determination of manganese content in iron ore, iron concentrate, sinter and pellet. Measurement range (mass fraction). 0.050% ~

5.00%.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 6682 Analytical laboratory water specifications and test methods

Preparation of pre - dried samples for analysis of iron ore GB/T 6730.1

Marking and Judgment of Numeric Ratification Rule and Limit Value of GB/T 8170

GB/T 10322.1 Iron Ore Sampling and Sample Preparation

GB/T 12806 laboratory glass instrument single standard line capacity bottle

GB/T 12807 Laboratory glass instruments - Index pipettes

3 principle

Samples with hydrochloric acid, nitric acid decomposition, add sulfuric acid evaporation to remove hydrochloric acid, filtration, the filtrate as the main liquid preservation. The residue is treated with hydrofluoric acid, coke sulfur

Potassium melted, combined with the main liquid. In sulfuric acid, phosphoric acid medium, in the heating conditions, with potassium periodate oxidation of bivalent manganese for the purple red manganese

Acid, the sodium nitrite reduction of the same measured solution as a reference, at a wavelength of 530nm, measured its absorbance, thereby measuring the manganese content.

4 reagent

In the analysis, unless otherwise specified, only approved analytical reagents and distilled water in accordance with GB/T 6682 or equivalent to its purity

Of water.