YS/T 509.10-2008Methods for chemical analysis of spodumene and lepidolite concentrates. Determination of manganous oxide content. Persulfate oxidation photometric method (English PDF)

Foreword

YS/T 509 Methods for chemical analysis of spodumene and lepidolite concentrates

consists of the following 11 parts:

--- Part 1: Determination of lithium oxide sodium oxide and potassium oxide

contents - Flame atomic absorption spectrometric method;

--- Part 2: Determination of rubidium oxide and caesium oxide contents - Flame

atomic absorption spectrometric method;

--- Part 3: Determination of silicon dioxide content - Gravimetric-molybdenum blue

photometric method;

--- Part 4: Determination of aluminium oxide content - EDTA compleximetric method;

--- Part 5: Determination of ferric oxide content- O-phenanthroline photometric

method and EDTA compleximetric method;

--- Part 6: Determination of phosphorus pentoxide content - The molybdenum blue

photometric method;

--- Part 7: Determination of beryllium oxide content – Chromazurol S and

cetyltrimethyl ammonium bromide spectrophotometric met;

--- Part 8: Determination of calcium oxide and magnesium oxide content - Flame

atomic absorption spectrometric method;

--- Part 9: Determination of fluorine content - Ion selective electrode method;

--- Part 10: Determination of manganous oxide content-Persulfate oxidation

photometric method;

--- Part 11: Determination of loss on ignition - Gravimetric method.

This Part is Part 10.

This Part replaced YS/T 509.11-2006 Methods for Chemical Analysis of Spodumene

and Lepidolite Concentrates - The Persulfate Oxidation Photometric Method for the

Determination of Manganous Oxide Content (original GB/T 3885.11-1983).

Compared with YS/T 509.11-2006, the major changes of this Part are as follows:

--- Re-edit the text format;

--- Supplement the quality assurance and control clauses; and add the repeatability

clause.

Methods for Chemical Analysis of Spodumene and

Lepidolite Concentrates - Determination of Manganous

Oxide Content - Persulfate Oxidation Photometric Method

1 Scope

This Part specifies the determination method of manganous oxide content in

spodumene and lepidolite concentrates.

This Part is applicable to the determination of manganous oxide content in spodumene

and lepidolite concentrates. Measurement range: 0.05%~1.00%.

2 Summary of Method

The sample is decomposed with hydrofluoric acid, nitric acid, and sulfuric acid. The

sulfuric acid emits smoke to drive off silicon and fluorine. Potassium pyrosulfate is

melted and leached with water. In an acid medium, silver salt is used as a catalyst to

oxidize divalent manganese to purple-red permanganate with ammonium persulfate;

and the manganese content is determined by spectrophotometry. Phosphoric acid and

urea are added to eliminate the interference of ferric iron and the reagent blank

generated during the oxidation process.

3 Reagents

Unless otherwise specified, only reagents and distilled water confirmed to be

analytically pure or water of equivalent purity are used in the analysis.