810 NTERNATIONAL STANDARD (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEKAyHAPOIHAH OPrAHW3ALIWS HO CTAHIAPTM3AIWW.ORGANISATION INTERNATIONALE DE NORMALISATION Magnesium and magnesium alloys - Determination of manganese -- Periodate photometric method (Manganese content less than 0,01 %) First edition -- 1973-11-01 UDC 669.721 : 546.711 : 543.42 Ref. No. ISO 810-1973 (E) ISO 810-1973 (E) Descriptors : magnesium, magnesium alloys, chemicai analysis, determination of content, manganese, photometry. Price based on 3 pages Copyright International Organization for Standardization ithout 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 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 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 resuits of the work of the Technicai Committees were published as iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Internationa! Standard 1S0 810 replaces ISO Recommendation R 810-1968 drawn up by Technical Committee ISO/TC 79, Light metals and their alloys. The Member Bodies of the following countries approved the Recommendation : India South Africa, Rep. of Argentina Austria Ireland Spain Belgium Israel Switzerland Bulgaria Italy Sweden Canada Turkey Japan United Kingdom Chile Korea, Rep. of U.S.A. Czechoslovakia Netherlands France New Zeaiand U.S.S.R. Germany Norway Yugoslavia Hungary Poland No Member Body expressed disapproval of the Recommendation. @ International Organization for Standardization, 1973 : Printed inSwitzerland Copyright International Organization for Standardization Not fo ISO 810-1973 (E) INTERNATIONAL STANDARD Magnesium and magnesium alloys - Determination of manganese -- Periodate photometric method (Manganese content less than 0,01 % ) 1 SCOPE AND FIELDOF APPLICATION sulphuric acid (3.3); add a few crystals of the potassium periodate (3.1) and continue boiling for about 10 min. This International Standard specifies a photometric method for the determination of manganese in magnesium and 3.6 Sodium nitrite, 20 g/l solution. magnesium alloys which do not contain zirconium, rare earths, or thorium1). Dissolve 2 g of sodium nitrite (NaNO2) in a little water and make up the voiume to 100 ml. The method is applicable to the determination of manganese content less than 0,01 %.2) 3.7 Manganese standard solution, 1 g/l (1 ml contains 1 mg of Mn), 2 PRINCIPLE prepared by one of the following methods. Attack of the sample with suiphuric acid, followed by oxidation with ammonium persuiphate. 3.7.1 In a tall-form beaker of suitable capacity (for example 400 ml) dissolve 2,877 g of very pure potassium Oxidation of manganese(Il) to manganese(Vll) by means of permanganate (KMnO4) in about 200 ml of water and add potassium periodate (acidity approximately 2 N), in the 40 m! of the sulphuric acid (3.3). Reduce the permanganate presence of phosphoric acid. solution by adding a few crystals of sodium sulphite or Photometric measurement at a wavelength of about hydrogen peroxide (36 % (m/m). Boil the soiution to 525 nm. remove excess SO2 or H2O2, cool, transfer quantitatively to a 1 000 ml volumetric flask, make up to volume and mix. 3 REAGENTS 3.7.2 In a tall-form beaker of suitable capacity (for For the preparation of solutions and during the analysis, example 600 ml) dissolve 1 ±0,001 g of electrolytic use doubly distilled water. manganese (purity above 99,9%) with 40 ml of the sulphuric acid (3.3) and about