ISO-3393-1976.pdf

INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDiZATloN .UEX:YHAPO,HAJI OPI-AHU3AllUII n0 CTAHLiAPTU3AUUU .ORGAN,SAT,ON ,NTERNAT,ONALE DE Nc,Rw,L,sAT,oN Cryolite, natural and artificial, and aluminium fluoride for industriai use - Determination of moisture content - Gravimetric method Cryolithe, naturelle et artificielle, et fluorure d aluminium d usage industriel - Oktermination de I humidite - Me thode gravime trique First edition - 1976-08-01 , ,J :i b 1 .i i,j,ii”) 1 6: i $, :I h at, : :f:K? k; UDC 661.862.36 : 543.712 Ref. No. IS0 3393-1976 (E) Descriptors : chemical compounds, cryolite, aluminium fluorides, chemical analysis, determination of content, humidity. Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:04:39 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 Member Bodies). The work of developing International Standards is carried out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 3393 was drawn up by Technical Committee ISO/TC 47, Chemistry, and was circulated to the Member Bodies in August 1974. It has been approved by the Member Bodies of the following countries : Austria Belgium Bulgaria Chile Egypt, Arab Rep. of France Germany Hungary India Ireland Israel Italy Netherlands New Zealand Portugal Romania No Member Body expressed disapproval of the document. 0 International Organization for Standardization, 1976 e South Africa, Rep. of Spain Sweden Switzerland Turkey United Kingdom u.s.s.R Yugoslavia Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:04:39 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 3393-1976 (E) Cryolite, natural and artificial, and aluminium fluoride for industriai use - Determination of moisture content - Gravimetric method 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a gravimetric method for determination of the moisture content of cryolite, natural and artificial, and aluminium fluoride for industrial use. 2 REFERENCES IS0 1619, Cryolite, natural and artificial - Preparation and storage of test samples. IS0 2925, Aluminium fluoride for industrial use - Prepa- ration and storage of test samples. 3 PRINCIPLE Drying of a test portion for 2 h at 110 “C and determina- tion of the loss in mass. 4 APPARATUS Ordinary laboratory apparatus, and 4.1 Weighing bottle, squat form, of diameter about 45 mm. 4.2 Electric oven, capable of being controlled at 110 It 5 “c. 5 PROCEDURE 5.1 Test portion Weigh, to the nearest 0,001 g, about 20 g of the crude test sample (see 3.2 of IS0 1619 or 2.2 of IS0 2925) in the weighing bottle (4.1), previously dried for 2 h in the oven (4.2) controlled at 110 f 5 “C, cooled in a desiccator and weighed, with its lid, to the nearest 0,001 g. 5.2 Determination Regulate the temperature of the oven (4.2) at 110 f 5 “C. Insert the weighing bottle containing the test portion (5.1), with its lid resting on top without closing the bottle, and a watch-glass of diameter slightly greater than that of the weighing bottle. After drying for 2 h, replace the lid by the watch-glass and transfer all to a desiccator. Afi-er cooling, close the weighing bottle with its lid and weigh to the nearest 0,001 g. 6 EXPRESSION OF RESULTS The moisture content is given, as a percentage by mass, by the formula m2-ml x 100 m0 where m0 is the mass, in grams, of the test portion (5.1); m7 is the mass, in grams, of the weighing bottle, with its lid, containing the test portion after drying; m2 is the mass, in grams, of the weighing bottle, with its lid, containing the test portion before drying. 7 TEST REPORT The test report shall include 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,determina- tion; d) any operation not included in this International Standard or in the International Standards to which reference is made, or regarded as optional. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:04:39 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3393-1976 (E) ANNEX ISD PUBLICATIONS RELATING TO CRYOLITE, NATURAL AND ARTIFICIAL, AND ALUMINIUM FLUORIDE FOR INDUSTRIAL USE CRYOLITE, NATURAL AND ARTIFICIAL IS0 1619 - Preparation and storage of test samples. IS0 1620 - Determination of silica content - Spectrophotometric method using the reduced molybdosilicate. IS0 1693 - Determination of fluorine content - Modified Willard-Winter method. IS0 1694 - Determination of iron content - l,lO-Phenanthroline photometric method. IS0 2366 - Determination of sodium content - Flame emission and atomic absorption spectrophotometric methods. IS0 2367 - Determination of aluminium content - 8-Hydroxy-quinoline gravimetric method. IS0 2830 - Determination of aluminium content - Atomic absorption method. IS0 3391 - Determination of calcium content - Flame atomic absorption method. IS0 3392 - Determination of water content - Electrometric method. IS0 3393 - Determination of moisture content - Gravimetric method. IS0 4277 - Evaluation of free fluorides content - Conventional titrimetric method. IS0 4280 - Determination of sulphates content - Barium sulphate gravimetric method. ALUMINIUM FLUORIDE FOR INDUSTRIAL USE IS0 2362 - Determination of fluorine content - Modified Willard-Winter method. IS0 2368 - Determination of iron content - l,lO-Phenanthroline photometric method. IS0 2369 - Determination of silica content - Spectrophotometric method using the reduced silicomolybdic complex. IS0 2925 - Preparation and storage of test sample. IS0 3392 - Determination of water content - Electrometric method. IS0 3393 - Determination of moisture content - Gravimetric method. IS0 4279 - Determination of sodium content - Flame emission spectrophotometric method. IS0 4280 - Determination of sulphates content - Barium sulphate gravimetric method. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 22:04:39 MDTNo reproduction or networking permitted without license from IHS -,-,-