5960 (TSO International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPrAHM3ALWA HO CTAHAAPTM3ALWM+ORGANISATION INTERNATIONALE DE NORMALISATION Copper alloys - Determination of cadmium content - Flame atomic absorption spectrometric method Alliages de cuivre -- Dosage du cadmium -- Méthode par spectrometrie d'absorption atomique dans la flamme First edition 1984-05-15 UDC 669.35 : 543.422 : 546.48 Ref. No.. 1ISO 5960-1984 (E) ISO 5960-1984 (E) Descriptors : copper, copper alloys, chemical analysis, determination of content, cadmium, atomic absorption method. Price based on 4 pages fromIHS Not for Re Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of developing International interested in a subject for which a technical committee has been authorized 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. International Standard ISO 5960 was developed by Technical Committee ISO/TC 26, Copper and copper alloys, and was circulated to the member bodies in May 1982. Austria Hungary Romania Belgium South Africa, Rep. of Iran Canada Italy Spain China Japan Sweden Korea, Dem. P. Rep. of Czechoslovakia Switzerland Egypt, Arab Rep. of Korea, Rep. of USA Finland USSR Mexico Norway France Poland Germany, F.R. The member body of the following country expressed disapproval of the document on technical grounds : Australia International Organization for Standardization, 1984 ? Printed in Switzerland Copyright International Organization for Standardization INTERNATIONAL STANDARD ISO 5960-1984 (E) Copper alloys - Determination of cadmium content - Flame atomic absorption spectrometric method Scope and field of application 50 ml of this solution contain 1 g of copper and 40 ml of the fluoroboric-nitric acid mixture (3.1). This International Standard specifies a flame atomic absorption spectrometric method for the determination of the cadmium 3.3 Cadmium, standard solution corresponding to 1,000 g content of cadmium-containing copper ailoys listed in Interna- of Cd per litre. tional Standards. Weigh, to the nearest 0,000 1 g, 1,000 g of cadmium meta The method is applicable to products having cadmium contents between 0,000 5 and 2,0 % (m/m). water and 5 ml of nitric acid, 1,4 g/ml. Cover and warm gently (if necessary) until the cadmium metal is dissolved. Boil gently until nitrous fumes have been expelled, then allow to 2 Principle cool. Transfer the solution to a 1 000 ml one-mark volumetric flask, dilute to the mark and mix. Dissolution of a test portion in fluoroboric-nitric acid mixture After appropriate dilution, aspiration of the test solution into an 1 ml of this standard solution contains 1 mg of Cd. air-acetylene flame, and determination of the cadmium content by spectrometric measurement of the absorption of the 3.4 Cadmium, standard solution corresponding to 0,050 g 228,8 nm line emitted by a cadmium hollow-cathode lamp. of Cd per litre. Place 50,0 ml of the standard cadmium solution (3.3) in a 3 Reagents 1 000 ml one-mark volumetric flask. Dilute to the mark and mix. During the analysis, unless otherwise stated, use only reagents 1 ml of this standard solution contains 50 μg of Cd of recognized analytical grade, and only distilled water or water of equivalent purity. 3.5 Cadmium, standard solution corresponding to 0,005 g of Cd per litre. 3.1 Fluoroboric-nitric acid, attack reagent. Place 100,0 ml of the standard cadmium solution (3.4) in a Mix together 300 ml of boric acid, 40 g/l solution, 30 ml of 1 000 ml one-mark volumetric flask. Dilute to the mark and mix hydrofluoric acid, 40 % (V/V) solution, 500 ml of nitric a