EN 24946:1990
(Main)Determination of copper content in steel and cast iron
Determination of copper content in steel and cast iron
This method is applicable to copper contents between 0.02 % (m/m) and 5 % (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. Annex B includes the graphical representation of precision data.
Ermittlung des Kupfergehalts von Stahl und Roheisen
Verstaendigung und Kommunikation.
Dosage du cuivre dans les aciers et les fontes
La présente Norme internationale spécifie une méthode spec- trophotométrique au 2,2'-biquinolyle, de dosage du cuivre dans les aciers et les fontes. La méthode est applicable aux teneurs en cuivre comprises entre 0,02 et 5 % (m/m).
Določevanje bakra v jeklu in litem železu
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ermittlung des Kupfergehalts von Stahl und RoheisenDosage du cuivre dans les aciers et les fontesDetermination of copper content in steel and cast iron77.080.01Železne kovine na splošnoFerrous metals in generalICS:Ta slovenski standard je istoveten z:EN 24946:1990SIST EN 24946:1997en01-december-1997SIST EN 24946:1997SLOVENSKI
STANDARD
SIST EN 24946:1997
SIST EN 24946:1997
SIST EN 24946:1997
International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION~MEIK~YHAPO~HAFI OPI-AHM3ALlMR I-IO CTAHAAPTbl3AIJWl~ORGANlSATlON INTERNATIONALE DE NORMALISATION Steel and cast iron - Determination of copper content - 2,2’-Diquinolyl spectrophotometric ‘method Aciers et fontes - Dosage du cuivre - M&ode spectrophotom&ique au 2,2’-biquinolyle First edition - 1984-12-15 Corrected and reprinted 1986-12-15 UDC 669.131.14 : 543.42 : 546.56 Ref. No. IS0 4946-1984 1 E) Descriptors : steels, cast iron, chemical analysis, determination of content, copper, spectrophotometric analysis. Price based on 6 pages SIST EN 24946:1997
Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each 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 IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 4946 was prepared by Technical Committee ISO/TC 17, S tee/. 0 International Organization for Standardization, 1984 Printed in Switzerland SIST EN 24946:1997
INTERNATIONAL STANDARD IS0 4946-1984 (E) Steel and cast iron - Determination of copper content - 2,2’-Diquinolyl spectrophotometric method 1 Scope and field of application This International Standard specifies a 2,2’-diquinolyl spec- trophotometric method for the determination of copper in steel and cast iron. The method is applicable to copper contents between 0,02 and 5 % (m/m). 2 Reference ISO/R 377, Selection and preparation of samples and test pieces for wrought steel. 3 Principle Dissolution of a test portion with appropriate acids. Fuming with perchloric acid to remove hydrochloric and nitric acids and dehydrate silicic acid. Reduction of copper to copper(l) in hydrochloric acid solution by means of ascorbic acid. Formation of a coloured compound of copper-( I) with 2,2’-diquinolyl. Spectrophotometric measurement at a wavelength of about 545 nm. 4 Reagents During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity, free from copper. 4.1 High-purity iron, containing 0,001 % (m/m) or less of copper. 4.2 Hydrochloric acid, Q approximately I,19 g/ml. 4.3 Nitric acid, e approximately 1,40 g/ml. 4.4 Perchloric acid, Q approximately 1,54 g/ml. NOTE - Perchloric acid, Q approximately I,67 g/ml, may also be used. 100 ml of perchloric acid, Q approximately I,54 g/ml, is equivalent to 79 ml of perchloric acid, Q approximately I,67 g/ml. 4.5 Perchloric acid, Q approximately I,54 g/ml, diluted 1 + 7. 4.6 Dimethylformamide (N, IV-dimethylformamide), Q approximately 0,944 g/ml. 4.7 Ascorbic acid, 200 g/l solution. Dissolve 20 g of ascorbic acid in water, dilute to 100 ml and mix. Prepare this solution immediately before use. 4.8 2,2’-Diquinolyl, solution. Dissolve 0,60 g of 2,2’-diquinolyl (cuproine) in the dimethyl- formamide (4.61, dilute to 1 litre with the same dimethyl- formamide and mix. Keep this solution in a dark-coloured glass receptacle and pro- tected from the light. 4.9 Copper, standard solutions. 4.9.1 Copper, standard solution, corresponding to I,0 g of Cu per litre. Weigh, to the nearest 0,000 1 g, 1,000 0 g of high purity cop- per and dissolve in a minimum of the nitric acid (4.3). Heat to boiling to remove nitrous fumes. Cool and transfer the solution quantitatively to a 1 000 ml one-mark volumetric flask, dilute to the mark and mix. 1 ml of this standard solution contains 1 mg of Cu. 4.9.2 Copper, standard solution, corresponding to 0,050 g of Cu per litre. Transfer 50,O ml of the copper standard so 1 000 ml one-mark volumetric flask, dilute to 1 ml of this standard solution contains 0,05 ution (4.9.1) to a the mark and mix. mg of Cu. 5 Apparatus Ordinary laboratory apparatus and 5. I Spectrophotometer. SIST EN 24946:1997
IS0 49464984 (El 6 Sampling Table 1 Carry out sampling in accordance with ISO/R 377 or
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