1、BRITISH STANDARD BS 4993-8: 1980 BS 5050-11: 1980 ISO 4280:1977 Methods of test for Aluminium fluoride for industrial use Part 8: Determination of sulphate content Methods of test for Cryolite Part 11: Determination of sulphate content ISO title: Cryolite, natural and artificial, and aluminium fluor
2、ide for industrial use Determination of sulphate content Barium sulphate gravimetric method UDC 661.8:555.634 + 661.862.362:546.226BS4993-8:1980 m 2 is the mass, in grams, of the barium sulphate found in the determination (7.2); 0,343 0is the factor for conversion of BaSO 4toSO 3 . 9 Test report The
3、 test report shall included the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operation not included in this International Standard or in the InternationalStandards to which
4、 reference is made, regarded as optional.BS4993-8:1980 & BS5050-11:1980 BSI 11-1999 3 Annex ISO Publications relating to cyrolite, natural and artificial, and aluminium fluoride for industrial use CRYOLITE, NATURAL AND ARTIFICIAL ISO 1619, Preparation and storage of test samples. ISO 1620, Determina
5、tion of silica content Reduced molybdosilicate spectrophotometric method. ISO 1693, Determination of fluorine content Modified Willard-Winter method. ISO 1694, Determination of iron content 1,10-Phenanthroline photometric method. ISO 2366, Determination of sodium content Flame emission and atomic ab
6、sorption spectrophotometric methods. ISO 2367, Determination of aluminium content 8-Hydroxyquinoline gravimetric method. ISO 2830, Determination of aluminium content Atomic absorption method. ISO 3391, Determination of calcium content Flame atomic absorption method. ISO 3392, Determination of water
7、content Electrometric method. ISO 3393, Determination of moisture content Gravimetric method. ISO 4277, Conventional test for evaluation of free fluorides content. ISO 4280, Determination of sulphate content Barium sulphate gravimetric method. ISO 5930, Determination of phosphorus content Reduced mo
8、lybdophosphate spectrophotometric method. ISO 5938, Determination of sulphur content X-ray fluorescence method. ISO. . ., Sampling. ALUMINIUM FLUORIDE FOR INDUSTRIAL USE ISO 2362, Determination of fluorine content Modified Willard-Winter method. ISO 2368, Determination of iron content 1,10-Phenanthr
9、oline photometric method. ISO 2369, Determination of silica content Spectrophotometric method using the reducec silicomolybdic complex. ISO 2925, Preparation and storage of test samples. ISO 3392, Determination of water content Electrometric method. ISO 3393, Determination of moisture content Gravim
10、etric method. ISO 4279, Determination of sodium content Flame emission spectrophotometric method. ISO 4280, Determination of sulphate content Barium sulphate gravimetric method. ISO 5930, Determination of phosphorus content Reduced molybdophosphate spectrophotometric method. ISO 5938, Determination
11、of sulphur content X-ray fluorescence method. ISO . . ., Sampling.4 blankBS4993-8:1980 & BS5050-11:1980 BSI 11-1999 Publications referred to See national foreword.BS 4993-8: 1980 BS 5050-11: 1980 ISO 4280:1977 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepen
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