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  • ISO 5930:1979

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Cryolite, natural and artificial, and aluminium fluoride for industrial use Determination of phosphorus content Reduced molybdophosphate photometric method

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Withdrawn date:  16-07-2021

    Language(s):  English, French

    Published date:  01-07-1979

    Publisher:  International Organization for Standardization

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    Abstract - (Show below) - (Hide below)

    Specifies a method applicable to products having phosphorus contents equal to or greater than 0,002 % (m/m). The principle is based on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid, dissolution of the fused mass in nitric acid, neutralization of suitable aliquot portion with sodium hydroxide solution, reaction with acid ammonium molybdate solution to form a molybdophosphate complex, reduction by a mixture of sodium disulphite and 4-amino-3-hydroxynaphtalene-1-sulphonic acid, and photometric measurement of the reduced complex.

    General Product Information - (Show below) - (Hide below)

    Document Type Standard
    Publisher International Organization for Standardization
    Status Withdrawn

    Standards Referenced By This Book - (Show below) - (Hide below)

    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 5050-12(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
    ISO/TR 4277:2009 Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
    PD ISO/TR 4277:2009 Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content
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