3980 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOIHA OPTAHM3ALIM IIO CTAHIAPTH3ALIMM.ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium and aluminium alloys --- Determination of copper Atomic absorption spectrophotometric method Aluminium et alliages d'aluminium -- Dosage du cuivre - Methode par spectrophotometrie d'absorption atomique First edition -- 1977-02-01 ISO 3980-1977 (E) UDC 669.71 : 546.56 : 543.422 Ref. No. ISO 3980-1977 (E) Descriptors : aluminium, aluminium alloys, chemicai analysis, determination of content, copper, spectrophotometric analysis, atomic absorption spectroscopic analysis. Price based on 3 pages Copyright International Organization for Standardization nsefrom IHS Not for Resale FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national 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. International Standard IsO 3980 was drawn up by Technical Committee IsO/Tc 79, Light metals and their alloys, and was circulated to the member bodies in November 1975. it has been approved by the member bodies of the following countries : Austria Japan Spain Korea, Rep. of Belgium Switzerland Turkey Czechoslovakia Mexico Norway France United Kingdom Germany Poland U.S.A. Hungary Portugal U.S.S.R. Yugoslavia India Romania Italy South Africa, Rep. of The member body of the following country expressed disapproval of the document on technical grounds : Australia @ International Organization for Standardization, 1977 : Printed in Switzerland Copyright International Organization for Standardization ted without license from IHS Not for Resale ISO 3980-1977 (E) INTERNATIONAL STANDARD Aluminium and aluminium alloys -- Determination of copper -- Atomic absorption spectrophotometric method 1 SCOPE to a 1 000 ml beaker (for example) and cover. Add, in small This International Standard specifies a method for the portions, 600 ml of the hydrochloric acid solution (4.1) determination of copper in aluminium and its alloys by and if necessary a drop of metallic mercury to facilitate the atomic absorption spectrophotometry. attack. If necessary, warm gently to assist the dissolution; then add some drops of the hydrogen peroxide solution 2 FIELD OF APPLICATION (4.2), and boil some minutes to remove the excess of hydrogen peroxide. This method is applicable to copper (Cu) contents between After cooling, transfer the solution thus obtained quanti- 0,005 and 5 % (m/m). tatively to a 1 000 ml volumetric flask; make up to voiume and mix. 3 PRINCIPLE 50 ml of this solution contains 1 g of aluminium and 30im! Dissolution of a test portion with hydrochloric acid and of hydrochloric acid solution (4.1). hydrogen peroxide. Atomization of this solution into an 5 ml of this solution contains 0,1 g of aluminium and 3.m! air-acetylene (or nitrous oxide-acetylene) flame of the of hydrochloric acid solution (4.1). atomic absorption apparatus. Comparison of the absorp- tion of the resonance energy of copper (wavelength nor- 2 ml of this solution contains 0,04 g of aluminium and mally 324,7 nm) with that of calibration solutions. 1,2 ml of hydrochloric acid solution (4.1). 4 REAGENTS 4.7 Copper, standard solution corresponding to 0,1 g of Cu per litre. During the analysis use only reagents of analytical grade and only distilled or de-ionized water. Transfer 1±0,001 g of electrotytic copper (purity ≥ 99,95 %) to a 250 ml beaker (for example) and cove