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STANDARD
SIST EN 28343:2009
SIST EN 28343:2009
SIST EN 28343:2009
International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEIK.4YHAPO~HAR OPl-AHM3ALWlR fl0 CTAHC1APTbI3ALWl@ORGANISATION INTERNATIONALE DE NORMALISATION Ferronickel - Determination od Silicon content - Gravimetric method Ferro-nicke/ - Dosage du silicium - NIethode gravimh trique First edition - 1985-10-15 UDC 669.243.881 : 543.21 : 546.28 Ref. No. ISO 83434985 (E) Descriptors : nickel, ferronickel, Chemical analysis, determination of content, Silicon, gravimetric analysis. Price based on 2 pages SIST EN 28343:2009
Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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 ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8343 was prepared by Technical Committee ISO/TC 155, Nickel and nicke1 alle ys. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 International Organkation for Standardkation, 1985 Printed in Switzerland SIST EN 28343:2009
INTERNATIONAL STANDARD ISO 8343-1985 (E) Ferronickel - Determination of Silicon content - Gravimetric method 1 Scope and field of application This International Standard specifies a gravimetric method for the determination of Silicon in ferronickel in the range 0,2 to 4,0 % b7?lmL 5 Apparatus Ordinary laboratory apparatus, and 5.1 Beaker, high form, of capacity 600 ml, unetched. 5.2 Platinum crucible, of capacity 40 ml. 2 Reference ISO 5725, Precision of tes t methods - Determination of repea tability and reproducibi&y b y in ter-labora tory tests. 3 Principle Dissolution of a test Portion in nitric acid and addition of per- chloric acid. Formation of insoluble silica by dehydration in perchloric acid, filtration, and weighing of the calcined pre- cipitate. Volatilization of the silica with hydrofluoric and sulfuric acids, weighing of the residue, determination of the silica by differente and calculation of the Silicon content. 4 Reagents During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrochlorit acid, e20 = 1,19 g/ml. 4.2 Hydrochlorit acid, e20 = 1,19 g/ml, diluted 1 + 9. 4.3 Hydrofluoric acid, e20 = 1,14 g/ml. WARNING - Hydrofluoric acid is extremely irritating and corrosive to skin and mucous membranes, producing severe skin burns which are slow to heal. In case of skin contact wash weil with water and seek medical advice. 4.4 Nitrit acid, @20 = 1,41 g/ml, diluted 1 + 1. 4.5 Perchlorit acid, c20 = 1,61 g/ml [70 % (mlm)]. 4.6 Sulfuric acid, ~20 = 1,83 g/ml, diluted 1 + 1. 5.3 Muffle furnace, capable of being maintained at 1100 OC. 5.4 Dessicator. 6 Sampling and samples 6.1 Sampling and preparation of the laboratory Sample shall be carried out by normal agreed procedures or, in case of dispute, by the relevant International Standard. 6.2 The laboratory Sample normally is in the form of granules, millings or drillings and no further preparation of the Sample is necessary. 6.3 If it is suspected that the laboratory Sample is con- taminated with oil or grease from the milling or drilling process, it shall be cleaned by washing with high purity acetone and dry- ing in air. 6.
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