5194 International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPrAHW3ALWA nO CTAHAAPTW3AUWW-ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium and aluminium alloys - Determination of zinc content --- Flame atomic absorption spectrometric method Aluminium et alliages d'aluminium -- Dosage du zinc -- Methode par spectrometrie d'absorption atomique dans la flamme First edition - 1981-11-15 UDC 669.71 : 543.422 : 546.47 ISO 5194-1981 (E) Ref. No. ISO 5194-1981 (E) Descriptors : aluminium, aluminium alloys, chemical analysis, determination of content, zinc, atomic absorption spectroscopic method Price based on 4 pages d without license from 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 Inter- national 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, governmenta! 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 5194 was developed by Technical Committee ISo/TC 79, Light metals and their alloys, and was circulated to the member bodies in December 1980. It has been approved by the member bodies of the following countries : Hungary South Africa, Rep. of Australia Austria India Spain Brazil Italy Sweden Canada Japan Switzerland China Korea, Rep. of United Kingdom Norway USA Czechoslovakia USSR France Poland Germany, F. R Romania The member body of the following country expressed disapproval of the document on technical grounds : Netherlands International Organization for Standardization, 1981 Printed in Switzerland Copyright International Organization for Standardization ISO 5194-1981 (E) INTERNATIONAL STANDARD Aluminium and aluminium alloys - Determination of zinc Flame atomic absorption spectrometric content - | method Scope and field of application 3.7 Aluminium, 20 g/l solution. This International Standard specifies a flame atomic absorption Weigh, to the nearest 0,01 g, 20 g of previously pickled extra spectrometric method for the determination of the zinc content pure aluminium (3.1), place it in a 1 000 ml beaker and cover with a watch glass. Add, in small portions, 600 ml of the of aluminium and aluminium alloys. hydrochloric acid solution (3.2) and, if necessary, a drop of The method is applicable to products having zinc (Zn) contents metallic mercury to assist the attack. if necessary, warm gently between 0,002 and 6 % (m/m). to aid the dissolution, then add a few drops of the hydrogen peroxide solution (3.3) and boil for a few minutes to remove the excess hydrogen peroxide. After cooling, quantitatively 2 Principle transfer to a 1 000 ml volumetric flask, dilute to the mark and mix. Dissolution of a test portion in hydrochloric acid and hydrogen peroxide. Aspiration of the solution into an air-acetylene flame and comparison of the absorbance of resonance energy by zinc 3.8 Aluminium, 2 g/l solution. in the test solution (wavelength of 213,9 nm normally) with that of standard solutions. Transfer 50,0 ml of the aluminium solution (3.7) to a 500 ml volumetric flask, add 270 ml of the hydrochioric acid solution (3.2) dilute to the mark and mix. Reagents During the analysis, use only reagents of recognized analytical 3.9 Zinc, standard solution corresponding to 1 g of Zn grade and distilled or deionized water. per litre. Weigh, to the nearest 0,001 g, 1 g of zinc (purity ≥99,99 %) 3.1 Aluminium, extra pure (purity 99,99 %), free from zinc. transfer it to a 400 ml beaker and cover with a watch glass. Add, in small portions, 50 mi of the hydrochloric a