YS/T 509.9-2008Methods for chemical analysis of spodumene and lepidolite concentrates. Determination of fluorine content. Ion selective electrode 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 aluminum 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 9.

This Part replaced YS/T 509.10-2006 Methods for Chemical Analysis of Spodumene

and Lepidolite Concentrates - The Ion Selective Electrode Method for the

Determination of Fluorine Content in Lepidolite Concentrates (original GB/T 3885.10-

1983).

Compared with YS/T 509.10-2006, the major changes of this Part are as follows:

--- Re-edit the text format;

Methods for Chemical Analysis of Spodumene

and Lepidolite Concentrates - Determination of

Fluorine Content - Ion Selective Electrode Method

1 Scope

This Part specifies the determination method of fluorine content in spodumene and

lepidolite concentrates.

This Part is applicable to the determination of fluorine content in spodumene and

lepidolite concentrates. Measurement range: 1.00%~10.00%.

2 Summary of Method

The test material is melted and decomposed with sodium hydroxide and sodium

peroxide. In the sodium citrate-potassium nitrate complex buffer solution with pH 7, the

standard addition method is used to determine fluorine with a fluoride ion selective

electrode.

Aluminum seriously interferes with the determination of fluorine. Add the sodium

citrate-potassium nitrate mixed solution to the alkaline solution and adjust to pH 7,

which can eliminate the interference of 10mg of aluminum oxide.

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.

6 Analysis Procedures