EN 24938:1990
(Main)Steel and iron - Determination of nickel content - Gravimetric or titrimetric method (ISO 4938:1988)
Steel and iron - Determination of nickel content - Gravimetric or titrimetric method (ISO 4938:1988)
The method is applicable to nickel contents between 0.5 % (m/m) and 30 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international co-operative tests, and Annex B represents the precision data graphically.
Eisen und Stahl - Bestimmung des Nickelgehalts - Gravimetrisches oder titrimetrisches Verfahren (ISO 4938:1988)
Qualitaet. Rationalisierung.
Aciers et fontes - Détermination de la teneur en nickel - Méthode gravimétrique ou titrimétrique (ISO 4938:1988)
La présente Norme internationale prescrit une méthode de dosage gravimétrique ou titrimétrique du nickel dans les aciers et les fontes. La méthode est applicable aux teneurs en nickel comprises entre 0,5 % (m/m) et 30 % (m/m).
Jeklo in železo - Določevanje niklja - Gravimetrična ali titrimetrična metoda (ISO 4938:1988)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Eisen und Stahl - Bestimmung des Nickelgehalts - Gravimetrisches oder titrimetrisches Verfahren (ISO 4938:1988)Aciers et fontes - Détermination de la teneur en nickel - Méthode gravimétrique ou titrimétrique (ISO 4938:1988)Steel and iron - Determination of nickel content - Gravimetric or titrimetric method (ISO 4938:1988)77.080.01Železne kovine na splošnoFerrous metals in general77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 24938:1990SIST EN 24938:1997en01-december-1997SIST EN 24938:1997SLOVENSKI
STANDARD
SIST EN 24938:1997
SIST EN 24938:1997
SIST EN 24938:1997
INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAfl OPf-AHM3AL/Mfl n0 CTAH~APTM3AL&lM ISO 4938 First edition 1988-12-01 Steel and iron - Determination of nicke1 content - Gravimetric or titrimetric method Aciers et fontes - Dosage du nicke1 - M6 thode gravimh trique ou titrimb trique Reference number ISO 4938: 1988 (E) SIST EN 24938:1997
ISO 4938 : 1988 (E) 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 4938 was prepared by Technical Committee ISO/TC 17, S teel. Annexes A and 6 of this International Standard are for information only. 0 International Organkation for Standardkation, 1988 0 Printed in Switzerland SIST EN 24938:1997
INTERNATIONAL STANDARD ISO 4938 : 1988 (El Steel and iron - Determination of nicke1 content - Gravimetric or titrimetric method 1 Scope This International Standard specifies a method for the determination of nicke1 in steel and iron, using either a gravimetric or titrimetric finish. The method is applicable to nicke1 contents from 0,5 % (mlm) to 30 % (mlm). 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 377 : 1985, Wrought steel - Selection and preparation of samples and test pieces. ISO 385-1 : 1984, Laboratory glassware - Burettes - Part 7 : General requiremen ts. ISO 648 : 1977, Laboratory glassware - One-mark pipettes. ISO 1042 : 1983, Laboratory glassware - One-mark volumetric flasks. ISO 4793 : 1980, Laboratory sin tered ffrittedl filters - Porosity grading, classifica tion and designa tion. ISO 5725 : 1986, Precision of test methods - Determination of repeatability and reproducibility for a Standard test method by in ter-labora tory tes ts. 3 Principle Dissolution of a test Portion with appropriate acids. Precipitation of the nicke1 as nicke1 dimethylglyoxime. - Cobalt, if present, is oxidized by potassium hexacyanoferrate(II1). - Copper, if present with Cobalt, preferably is removed by controlled-potential electrolysis. Acid dissolution of the precipitate and filtration of the solution, followed by a second precipitation of the nicke1 as nicke1 dimethylglyoxime. In the case of the gravimetric finish, weighing of the dried nicke1 dimethylglyoxime precipitate. In the case of the titrimetric finish, acid dissolution of the precipitate, addition of excess EDTA.Na* Solution and back titration of the excess EDTA.Naz by zinc Solution using xylenol orange as an indicator. 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 Sodium hydrogen sulfate (Nat-lSO& 4.2 Ethanol, 95 % ( V/ VI. 4.3 Acetic acid, glacial, Q approximately 1,05 g/ml. 4.4 Hydrofluoric acid, Q approximately 1,15 g/ml. 4.5 Nitrit acid, Q approximately 1,40 g/ml. 4.6 Perchlorit acid, Q approximately 1,54 g/ml. 4.7 Sulfuric
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