(ISO 886 NTERNATIONAL STANDARD NTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOHAH OPTAHH3ALIH IO CTAHIAPTH3ALIWM.ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium and aluminium alloys --- Determination of manganese -- Photometric method (Manganese content between 0,005 and 1,5 %) First edition -- 1973-11-15 UDC 669.71 : 546.711 : 543.42 Ref. No. 1SO 886-1973 (E) ISO 886-1973 (E) Descriptors : aluminium, aluminium alloys, chemical analysis, determination of content, manganese, photometry. Price based on 5 pages Copyright International Organization for Standardization 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 governmental and non-governmental, in liaison with sO, 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 Technical Committees were published as Iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, International Standard ISO 886 replaces ISO Recommendation R 886-1968 drawn up by Technical Committee ISO/TC 79, Light metals and their alloys. The Member Bodies of the following countries approved the Recommendation : Hungary Australia Spain Austria Ireland Sweden Belgium Israel Switzerland Canada Italy Thailand Turkey Chile Japan Czechoslovakia Netherlands U.S.A. Norway France U.S.S.R. Germany Poland Yugoslavia Greece South Africa, Rep. of Body of the following country expressed disapproval of the The Member Recommendation on technical grounds : United Kingdom @ initernational Organization for Standardization, 1973 Printed in Switzerland Copyright International Organization for Standardization from IHS INTERNATIONAL STANDARD ISO 886-1973 (E) Aluminium and aluminium alloys -- Determination of manganese - Photometric method (Manganese content between 0,005 and 1,5 % ) 1 SCOPE AND FIELD OF APPLICATION 3.2 Sodium hydroxide, 200 g/t solution. This International Standard specifies a photometric method In a nickel dish dissolve 200 g of sodium hydroxide (NaOH) in water and, after cooling, make up the volume to for the determination of manganese in aluminium and aiuminium alloys. 1 000 ml. Keep in a plastics container. The method is applicable to the determination of 3.3 Sulphurous acid solution manganese content between 0,005 and 1,5 %. Pass a current of sulphur dioxide gas (SO2) through water The method does not apply completely to the following until saturation point is reached. special cases : a) ailoys with a silicon content higher than 10 % and a 3.4 Sulphuric acid, p 1,48 g/ml, approximately 17,5 N manganese content less than 0,1 % (see Annex); solution. b) aluminium alloys containing tin, antimony, bismuth, Carefully add 500 m! of sulphuric acid (p 1,84 g/ml) zirconium, etc. (In this International Standard these approximately 35,6 N, to water, cool and make up the special cases are not treated.) volume to 1 000 ml. 3.5 Sulphuric acid, p 1,84 g/ml, approximately 35,6 N solution. 2 PRINCIPLE 3.6 Nitric acid, p 1,40 g/ml, approximately 15 N solution. Attack of the sample with sodium hydroxide. Acidification by sulphuric and nitric acids. 3.7 Hydrofluoric acid, 40 % (m/m) solution (p approxi- mately 1,14 g/ml). Oxidation of manganese(ll) to manganese(Vll) by means of potassium periodate (acidity of solution over 3,5 N 3.8 Fluoroboric acid solution approximately), in the presence of phosphoric acid. In a plastics flask mix 800 ml of saturated boric acid Photometric measurement at a wavelength of about solution at 20 °c with 200 ml of t