1、BRITISH STANDARD BS 4993-10: 1983 BS 5050-13: 1983 ISO 6374:1981 Methods of test for Aluminium fluoride for industrial use Part 10: Determination of phosphorus content Methods of test for Cryolite Part 13: Determination of phosphorus content ISO title: Cryolite, natural and artificial, and aluminium
2、 fluoride for industrial use Determination of phosphorus content Atomic absorption spectrometric method after extraction UDC 661.862.361:543.422.062:546.18BS4993-10:1983 b) the test solution (6.3.1); c) the blank test solution (6.4). 6.4 Blank test Carry out a blank test at the same time as the dete
3、rmination and following the same procedure, using the same quantities of all the reagents as for the determination, but omitting the test portion(6.1). 7 Expression of results From the calibration graph (6.2.3), determine the masses of P corresponding to the values of the measured absorbances of the
4、 test solution and the blank test solution. The phosphorus content, expressed in milligrams of P 2 O 5per kilogram, is given by the formula where m 0 is the mass, in grams, of the test portion(6.1); m 1 is the mass, in micrograms, of P found in the test solution (6.3.1); m 2 is the mass, in microgra
5、ms, of P found in the blank test solution (6.4); 2,29is the factor for conversion from P to P 2 O 5 . 8 Test report The test report shall include the following particulars: a) an identification of the sample; b) the reference of the method used; c) the results and the method of expression used; d) a
6、ny unusual features noted during the determination; e) any operation not included in this International Standard or in the International Standards to which reference is made, or regarded as optional.BS4993-10:1983 & BS 5050-13:1983 4 BSI 11-1999 Annex ISO publications relating to cryolite, natural a
7、nd artificial, and aluminium fluoride for industrial use Cryolite, natural and artificial ISO 1619, Preparation and storage of test samples. ISO 1620, Determination of silica content Reduced molybdosilicate spectrophotometric method. ISO 1693, Determination of fluorine content Modified Willard-Winte
8、r method. ISO 1694, Determination of iron content 1,10-Phenanthroline photometric method. ISO 2366, Determination of sodium content Flame emission and atomic absorption spectrophotometric methods. ISO 2367, Determination of aluminium content 8-Hydroxyquinoline gravimetric method. ISO 2830, Determina
9、tion of aluminium content Atomic absorption method. ISO 3391, Determination of calcium content Flame atomic absorption method. ISO 3392, Determination of water content Electrometric method. ISO 3393, Determination of moisture content Gravimetric method. ISO 4277, Evaluation of free fluorides content
10、 Conventional titrimetric method. ISO 4280, Determination of sulphates content Barium sulphate gravimetric method. ISO 5930, Determination of phosphorus content Reduced molybdophosphate photometric method. ISO 5938, Determination of sulphur content X-ray fluorescence spectrometric method. ISO 6374,
11、Determination of phosphorus content Atomic absorption spectrometric method after extraction. Aluminium fluoride for industrial use ISO 2362, Determination of fluorine content Modified Willard-Winter method. ISO 2368, Determination of iron content 1,10-Phenanthroline photometric method. ISO 2369, Det
12、ermination of silica content Spectrophotometric method using the reduced silicomolybdic complex. ISO 2925, Preparation and storage of test samples. ISO 3392, Determination of water content Electrometric method. ISO 3393, Determination of moisture content Gravimetric method. ISO 4279, Determination o
13、f sodium content Flame emission spectrophotometric method. ISO 4280, Determination of sulphates content Barium sulphate gravimetric method. ISO 5930, Determination of phosphorus content Reduced molybdophosphate photometric method. ISO 5938, Determination of sulphur content X-ray fluorescence spectrometric method. ISO 6374, Determination of phosphorus content Atomic absorption spectrometric method after extraction.
