ISO NTERNATIONAL STANDARD 795 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOIHA OPIAHW3ALIW IO CTAHIAPTH3AWN.ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium and aluminium alloys -- Determination of copper content --- Oxalyldihydrazide photometric method Aluminium et alliages d'aluminium -- Dosage du cuivre -- Methode photométrique a I'oxalyldihydrazide First edition -- 1976-02-01 ISO 795-1976 (E) UDC 669.71 : 546.56 : 543.4 Ref. No. ISO 795-1976 (E) Descriptors : aluminium, aluminium alloys, chemical analysis, determination of content, copper, spectrophotometric method. Price based on 4 pages Not for Resale FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of nationai standards institutes (IsO Member Bodies). The work of developing International Standards is carried out through IsO 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 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. Prior to 1972, the results of the work of the Technial Committees were published as Iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 79 has reviewed ISO Recommendation R 795 and found it technically suitable for transformation. International Standard ISO 795 therefore IsO Recommendation R 795 was approved by the Member Bodies of the following countries : Austria Hungary Spain Belgium Korea, Rep. of Sweden Brazil India Switzerland Turkey Bulgaria Ireland Canada Israel U.S.A. U.S.S.R. Chile Italy Netheriands Yugoslavia Czechoslovakia Norway Egypt, Arab Rep. of France Poland Germany South Africa, Rep. of Body of the following country expressed disapproval of the The Member Recommendation on technical grounds : United Kingdom The Member Bodies of the following countries disapproved the transformation of ISO/R 795 into an International Standard : Switzerland United Kingdom @* International Organization for Standardization, 1976 : Printed in Switzerland Copyright International Organization for Standardizatior ISO 795-1976 (E) INTERNATIONAL STANDARD Aluminium and aluminium alloys -- Determination of copper content -- Oxalyldihydrazide photometric method SCOPE AND FIELD OF APPLICATION 3.5 Hydrogen peroxide, 36 % (m/m), p 1,12 g/ml, approximately 120 volumes. This International Standard specifies an oxalyldihydrazide photometric method for the determination of copper 3.6 Ammoniasoiution, p 0,90 g/ml, approximately content in aluminium and aluminium alloys. 14,4 N. The method is applicable to the determination of copper content between 0,002 and 0,8 % (m/m). 3.7 Citric acid, 500 g/l solution. Dissolve 500 g of citric acid (CgHgO,.H20) in water and The method is not completely applicable in the special case make up the volume to 1 000 ml. of alloys with silicon contents exceeding 1 % (m/m), for which it should be modified as described in the annex. 3.8 Acetaldehyde, 400 g/t solution. In a 1 000 ml volumetric flask, piace 400 g of acetaldehyde (CH3CHO), cool to approximately 5°℃ 2 PRINCIPLE slowly add cooled distilled water (at about 5 °C), and make Attack with hydrochloric acid. up the volume to 1 000 ml. Formation between pH 9,1 and pH 9,5, in the presence of acetaldehyde, of the violet-coloured copper-oxalyldihy NOTE --. Since heat is produced when drazide complex, the optimum pH range being obtained cetaldehyde by adding a controlled amount of ammonia. it is recommended that the vessel in which the mixing takes place shouldbecooledbycoidwater. Photometric measurement at a wavelength of about 540 nm.1) 3.9 Oxalyldihydrazide, 2,5 g/l