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BS 4993-3:1974

Current
Current

The latest, up-to-date edition.

Methods of test for aluminium fluoride for industrial use Determination of silica content
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

02-28-1974

Cooperating organizations
Foreword
Method
1. Scope
2. Field of application
3. Principle
4. Reagents
5. Apparatus
6. Procedure
7. Calculation

Fusion of a test portion with sodium carbonate/boric acid, dissolution of the melt in nitric acid, formation of the yellow (oxidized) silico-molybdic complex, reduction to the blue form and spectrophotometric measurement at 815 nm.

This Part of BS 4993 specifies a spectrophotometric method for the determination of the silica content of aluminium fluoride for industrial use.

NOTE The titles of the British Standards referred to in this standard are listed on the inside back cover.

Committee
W/-
DevelopmentNote
Supersedes 71/53613 DC. (07/2005) Reviewed and confirmed by BSI, December 2011. (11/2011)
DocumentType
Standard
Pages
10
PublisherName
British Standards Institution
Status
Current

Standards Relationship
ISO 2369:1972 Similar to

BS 4993-5:1980 Methods of test for aluminium fluoride for industrial use Determination of moisture content (Karl Fischer method)
BS 4993-9:1980 Methods of test for aluminium fluoride for industrial use Determination of sulphur content (X-ray fluorescence spectrometric method)
BS 5050-11(1980) : 1980 METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULPHATE CONTENT
BS 5050-9(1980) : 1980 METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (KARL FISHER METHOD)
BS 4993-7:1980 Methods of test for aluminium fluoride for industrial use Determination of sodium content
BS 4993-8:1980 Methods of test for aluminium fluoride for industrial use Determination of sulphate content
BS 5050-13(1983) : 1983 METHODS OF TEST FOR CRYOLITE - DETERMINATION OF PHOSPHORUS CONTENT
BS 5050-10(1980) : 1980 METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (GRAVIMETRIC METHOD)
BS 5050-12(1980) : 1980 METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULFUR CONTENT (X-RAY FLUORESCENCE SPECTROMETRIC METHOD)
BS 4993-10:1983 Methods of test for aluminium fluoride for industrial use Determination of phosphorus content
BS 6337-2:1983 General methods of chemical analysis Method for determination of silicon content (reduced molybdosilicate spectrophotometric method)
BS 4993-6:1980 Methods of test for aluminium fluoride for industrial use Determination of moisture content (gravimetric method)

BS 3145:1978 Specification for laboratory pH meters
BS 2586:1979 Specification for glass and reference electrodes for the measurement of pH
BS 3422(1961) : LATEST LABORATORY DEFLECTION pH METERS

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