ISO-1812-1976.pdf
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1、INTERNATIONAL STANDARD 1812 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXYHAPOJIHAR OPrAHM3AUHR II0 CTAHAPTA3AUII.ORGANISATION INTERNATIONALE DE NoRMALKATON Copper alloys - Determination of iron content - 1 ,I O-Phenanthroline spectrophotometric method Alliages de cuivre - Dosage du fer - M N D
2、escriptors : copper alloys, chemical analysis, determination of content, iron, spectrophotometric analysis. ii Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2
3、007 07:56:18 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing International Standards is carried out throu
4、gh IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft Internation
5、al Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. Prior to 1972, the results of the work of the technical committees were published as IS0 Recommendations; these documents are in th
6、e process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 26, Copper and copper alloys, has reviewed IS0 Recommen- dation R 1812-1971 and found it technically suitable for transformation. International Standard IS0 1812 therefore replaces IS0 Re
7、commen- dation R 1812-1971, to which it is technically identical. IS0 Recommendation R 1812 had been approved by the member bodies of the following countries : Australia Belgium Brazil Canada Chile Czechoslovakia Egypt, Arab Rep. of Finland France Germany Greece Hungary India Iran Israel Italy Japan
8、 Netherlands New Zealand Norway Peru Poland South Africa, Rep. of Spain Sweden Switzerland Turkey United Kingdom U.S.A. Yugoslavia No member body had expressed disapproval of the Recommendation. The member bodies of the following countries disapproved the transformation of the Recommendation into an
9、 International Standard : Hungary Italy 0 International Organization for Standardization, 1976 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:56:18 M
10、DTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 1812-1976 (E) Copper alloys - Determination of iron content - 1 ,I 0-Phenanthroline spectrophotometric method 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a 1 ,lO-phenanthro-
11、 line spectrophotometric method for the determination of the iron content of copper alloys. The method is applicable to the determination of iron contents up to 0,4 % (m/m) in any of the copper alloys listed in IS0 publications. 2 REFERENCE ISO/R 1811, Chemical analysis of copper and copper alloys -
12、 Sampling of copper refinery shapes. 3 PRINCIPLE Extraction of the iron from a test portion as the ironfll I)- chlorocomplex with methyl isobutyl ketone, and spectro- photometric measurement of the iron(II)-l,lO-phenanthro- line complex at a wavelength corresponding to maximum absorption. 4 REAGENTS
13、 During the analysis, use only reagents of recognized analytical grade and only distilled or deionized water. For the determination of iron contents lower than 0,Ol % (m/m), use double-distilled water. 4.1 Methyl isobutyl ketone. 4.2 Hydrogen peroxide, 30 % (m/m) solution. 4.3 Hydrochloric acid, 7 +
14、 3 (V + V) solution. Mix 70 ml of hydrochloric acid, p approximately I,19 g/ml, with 30 ml of water. 4.4 Hydrochloric acid, 1 + 1 (V + V) solution. Mix 50 ml of hydrochloric acid, p approximately 1.19 g/ml, with 50 ml of water. 4.5 Ascorbic acid, IO g/l solution. Dissolve 5 g of ascorbic acid in wat
15、er and dilute to 500 ml. This solution is stable for 3 or 4 days. 4.6 l,lO-Phenanthroline, buffered solution. Mix 1 g of l,lO-phenanthroline hydrochloride monohydrate (C12H8N2.HCI.H20) with 215 ml of glacial acetic acid in a 500 ml one-mark volumetric flask and add, while cooling, 265 ml of ammonia
16、solution, p 0,91 g/ml. This mixture should have a pH of 6,5 + 0,l. Adjust, if necessary, by adding either ammonia solution or glacial acetic acid, then dilute to 500 ml. This solution is stable. 4.7 Iron, stock solution (1 ml =” 0,l mg of Fe). Dissolve 0,l f 0,Ol g of high purity iron in 20 ml of hy
17、dro- chloric acid, p 1 ,I9 g/ml, and dilute to 1 I. 4.8 Iron, standard solution (1 ml c IO pg of Fe). Dilute 50 ml of the iron stock solution (4.7) to 500 ml. 5 APPARATUS Ordinary laboratory apparatus and 5.1 Spectrophotometer, fitted with cells of optical path length 2 cm. NOTE - All glassware shal
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