Ferronickel - Determination of cobalt content - Flame atomic absorption spectrometric method (ISO 7520:1985)

Applies to cobalt contents in the range 0,025 to 2,5 % (m/m). Specifies principle, reagents, apparatus, sampling and samples, procedure, expression on results, special cases and test report.

Ferronickel - Bestimmung des Cobaltgehaltes - Atomabsorptions-Spektralfotometrisches Verfahren (ISO 7520:1985)

Ferro-nickel - Dosage du cobalt - Méthode par spectrométrie d'absorption atomique dans la flamme (ISO 7520:1985)

La présente Norme internationale spécifie une méthode de dosage du cobalt par spectrométrie d'absorption atomique dans la flamme dans les ferro-nickels dont la teneur en cobalt est comprise entre 0,025 et 2,5 % (m/m).

Feronikelj - Določevanje kobalta - Plamenska atomska absorpcijska spektrometrična metoda (ISO 7520:1985)

General Information

Status
Published
Publication Date
05-Nov-1991
Withdrawal Date
05-May-1992
Technical Committee
Drafting Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
13-Oct-1999
Completion Date
13-Oct-1999

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EN 27520:2009
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ferronickel - Bestimmung des Cobaltgehaltes - Atomabsorptions-Spektralfotometrisches Verfahren (ISO 7520:1985)Ferro-nickel - Dosage du cobalt - Méthode par spectrométrie d'absorption atomique dans la flamme (ISO 7520:1985)Ferronickel - Determination of cobalt content - Flame atomic absorption spectrometric method (ISO 7520:1985)77.100Železove zlitineFerroalloysICS:Ta slovenski standard je istoveten z:EN 27520:1991SIST EN 27520:2009en,fr,de01-november-2009SIST EN 27520:2009SLOVENSKI
STANDARD



SIST EN 27520:2009



SIST EN 27520:2009



SIST EN 27520:2009



International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEX~YHAPOAHAR OPI-AHM3AUMR fl0 CTAH,QAPTM3ALWl~ORGANISATION INTERNATIONALE DE NORMALISATION Ferronickel - Determination of Cobalt content - Flame atomic absorption spectrometric method Ferro-nicke1 - Dosage du Cobalt - Mhthode par spectromhrie d’absorption atomique dans Ia flamme First edition - 1985-11-15 UDC 669.243.881: 543.422 : 546.73 Ref. No. ISO 75204985 (E) Descriptors : nickei, ferronickel, Chemical analysis, determination of content, Cobalt, atomic absorption method. Price based on 3 pages SIST EN 27520:2009



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 7520 was prepared by Technical Committee ISO/TC 155, Nickel and nicke/ alfoys. 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 othennlise stated. 0 International Organkation for Standardkation, 1985 Printed in Switzerland SIST EN 27520:2009



INTERNATIONAL STANDARD ISO 75204985 (E) Ferronickel - Determination of Cobalt content - Flame atomic absorption spectrometric method 1 Scope and field of application This International Standard specifies a flame atomic absorption spectrometric method for the determination of the Cobalt con- tent of ferronickel in the range 0,025 to 2,5 % (mlm). 2 References ISO 385/1, Laborstory glassware - Burettes - Part 1: General requiremen ts. ISO 648, Laboratory glassware - One-mark pipettes. ISO 1042, Laborstory glassware - One-mark volumetric flasks. ISO 5725, Precision of test methods - Determination of repea tabiWy and reproducibility by in ter-labora tory tests. ISO 6352, Ferronickel - Determination of nicke/ tonten t - Dimethylglyoxime gravimetric method. 3 Principle Dissolution of a test Portion in a nitric acid-hydrochloric acid mixture. Precipitation of silica by dehydration in perchloric acid. Removal of silica by filtration. Addition of lanthanum for elimination of potential interferences. Determination of Cobalt by atomic absorption spectrometry in an air-acetylene flame at a wavelength of 240,7 nm. NOTE - This analysis tan be carried out on solutions which have been used for the determination of nicke1 by ISO 6352. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrochlorit acid, 020 = 1,19 g/ml. 4.2 Hydrochlorit acid, ~20 = 1,19 g/ml, diluted 1+9. 4.3 Nitrit acid, 020 = 1,41 g/ml, diluted 1 + 1. 4.4 Perchlorit acid, ~20 = 1,61 g/ml [72 % (mlm)]. 4.5 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. 4.6 Lanthanum, Solution, containing 200 g of La per litre. Weigh 250 g of lanthanum chloride hexahydrate ( LaC13m 6H2O) and transfer to a 600 ml beaker. Add 25 ml of hydrochloric acid (4.1) and 300 ml of water. Stir to complete dissolution. Filter, if necessary, into a 500 ml one-mark volumetric flask, make up to the mark with water and mix. 4.7 Nickel plus iron, matrix Solution, containing 12 g of Ni and 28 g of Fe per Iitre. 4.7.1 Weigh 12,0 g of high purity nicke1 powder [containing less than 0,001 % (mlm) Cobalt] into an 800 ml beaker. Add 50 ml of water and 50 ml of nitric acid (pzo = 1,41 g/ml). When the initial reaction subsides, stir and heat to complete
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