EN 26352:1991

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ferronickel - Bestimmung des Nickelgehaltes - Gravimetrisches Verfahren mit Dimethylglyoxim (ISO 6352:1985)Ferro-nickel - Dosage du nickel - Méthode gravimétrique à la diméthylglyoxime (ISO 6352:1985)Ferronickel - Determination of nickel content - Dimenthylglyoxime gravimetric method (ISO 6352:1985)77.100Železove zlitineFerroalloysICS:Ta slovenski standard je istoveten z:EN 26352:1991SIST EN 26352:2009en,fr,de01-november-2009SIST EN 26352:2009SLOVENSKI
STANDARD



SIST EN 26352:2009



SIST EN 26352:2009



SIST EN 26352:2009



International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)I(~YHAPOflHAR OPI-AHM3ALWlfl l-l0 CTAH~APTM3ALWl.ORGANISATION INTERNATIONALE DE NORMALlSATlON Ferronickel - Determination od nicke1 content - Dimethylglyoxime gravimetric method Ferro-nickel - Dosage du nicke1 - M&hode gravimb trique a Ia dim&h ylglyoxime First edition - 1985-12-15 UDC 669.15-198 : 543.7 : 546.74 Ref. No. ISO 6352-1985 (E) Descriptors : ferroalloys, ferronickel, Chemical analysis, determination of content, nickel, gravimetric analysis, dimethylglyoxime. Price based on 6 pages SIST EN 26352:2009



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 6352 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 othenGse stated. 0 International Organkation for Standardkation, 1985 Printed in Switzerland SIST EN 26352:2009



INTERNATIONAL STANDARD ISO 6352-1985 (E) Ferronickel - Determination of nicke1 content - Dimethylglyoxime gravimetric method 1 Scope and field of application This International Standard specifies a gravimetric method for the determination of the nicke1 content of ferronickel in the range 15 to 60 % Hm). 2 References ISO 38511, Laboratory glassware - Burettes - Part 7: General requiremen ts. ISO 648, Laboratory glassware - One-mark pipettes. I S 0 1042, Labora tory glassware - One-mark volume tric flasks. ISO 5725, Precision of test methods - Determination of repea tability and reproducibility b y in ter-labora tory tests. 3 Principle Dissolution of a test Portion in nitric acid. Precipitation of silica by dehydration in perchloric acid. Removal of silica by filtration. Precipitation of nicke1 from a tartro-ammoniacal medium by an ethanolic Solution of dimethylglyoxime. A second precipitation of nicke1 and weighing after drying at 150 OC. Determination of residual nicke1 in the filtrates by atomic absorption spec- trometry. 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 Acetic acid, ~20 = 1,05 g/ml, diluted 1 + 1. 4.2 Ammonium hydroxide, 020 = 0,925 g/mI. 4.3 Dimethylglyoxime, 10 g/l Solution in ethanol. 4.4 Hydrochlorit acid, -20 = 1,19 g/ml. 4.5 Hydrochlorit acid, ~~~ = 1,19 g/ml, diluted 1 +9. 4.6 Nitrit acid, 1020 = 1,41 g/ml. 4.7 Nitrit acid, ~~~ = ‘l,41 g/ml, diluted 1 + 1. 4.8 Perchlorit acid, ~~~ = 1,61 g/ml [72 % (mlm)]. 4.9 Tartaric acid, 500 g/l Solution. 4.10 Hydrofluoric acid, ~2~ = 1,14 g/ml, diluted 1 + 1. 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. 5 Apparatus Ordinary laboratory apparatus, and 5.1 Filtration crucible, fritted glass, of approximately 10 to 20 Pm pore diameter. 5.2 Glass beakers, of capacity 600 ml, clean, unetched and flat bottomed. 5.3 Pipettes, of capacities 50 and 100 ml, in accordance with ISO 648, class A. 5.4 Volumetric flasks, of capacities 200 and 1 000 ml, in ac- cordante with ISO 1042, class A. 5.5 Polytetrafluoroethylene (PTFE) beaker, of capacity 600 ml, for samples with a high Silicon content. 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 Internation
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