548 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPFAHV3AMH HIO CTAHAAPTW3AUWMORGANISATION INTERNATIONALE DE NORMALISATION Manganese ores -- Determination of barium oxide content - Barium sulphate gravimetric method Minerais de manganese - Dosage de I'oxyde de baryum - Methode gravimetrique a I'etat de sulfate de baryum Second edition-1981-11-15 UDC 669.74 :543.21 : 546.431-31 548-1981 (E) Ref.No。1SO548-1981 (E) Descriptors : manganese ores, chemical analysis, determination of content, barium oxides, gravimetric analysis. Copyright Not for Resale Price based on 2 pages No reproduction or networking permitted without license from IHS 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 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 548 was developed by Technical Committee ISO/TC 65, Manganeseandchromiumores. This second edition was submitted directly to the Iso Council, in accordance with clause 5.10.1 of part 1 of the Directives for the technical work of IS0. It cancels and replaces the first edition (i.e. ISO 548-1975), which had been approved by the member bodies of the following countries : Australia Hungary Romania Austria India South Africa, Rep. of Chile Iran Spain Czechoslovakia Ireland United Kingdom Egypt, Arab Rep. of Italy USSR France Japan Yugoslavia Germany, F. R. Poland No member body had expressed disapproval of the document. InternationalOrganizationforStandardization,1981 Printed in Switzerland with ISC Nt fr Resale INTERNATIONALSTANDARD ISO 548-1981 (E) Manganese ores -- Determination of barium oxide content -- Barium sulphate gravimetric method 1 Scope and field of application 4.6 Sulphuric acid, g 1,84 g/ml. This International Standard specifies a barium sulphate 4.7 Sulphuric acid, diluted 1 + 4. gravimetric method for the determination of the barium oxide content of manganese ores. 4.8 Sulphuric acid, diluted 1 + 1 000. This International Standard should be read in conjunction with ISO4297. 4.9 Hydrofluoric acid, 40 % (m/m). References 4.10 Hydrogen peroxide, 30 % (perhydrol). IsO 4296/1, Manganese ores - Sampling - Part 1: Incre- 4.11 Ammonium acetate, 600 g/l solution. ment sampling.1) 4.12 Sodium carbonate, 10 g/I solution. ISO 4296/2, Manganese ores - Sampling - Part 2 : Prepara- tion of samples. 1) 4.13 Silver nitrate, 2 g/l solution. Iso 4297,Manganese ores and concentrates - -Methodsof chemical analysis - General instructions. 5 Apparatus 3 Principle Ordinary laboratory apparatus and Fusionof atestportionwithsodiumpotassium carbonate; ex- traction of the fusion in water, filtering and dissolution of the 5.1 Platinum crucibles. barium carbonate in hydrochloric acid. Separation of the silicic acid, and precipitation of barium as barium sulphate, with a small quantity of sulphuric acid in weak hydrochloric acid solu- tion. Filtration,ignition and weighing of the residue of barium 6 Sample suiphate. For increment sampling of manganese ores, see ISO 4296/1. For the preparation of the samples, see ISo 4296/2. 4 Reagents Use a test sample which has been crushed to a size not ex- 4.1 Sodium potassium carbonate, anhydrous. ceeding 100 μm (checked on a sieve of appropriate size) and air-dried under laboratory conditions. 4.2 Sodium carbonate (Na2CO3). 4.3 Hydrochloric acid, 1,19 g/ml. 7 Procedure 4.4 Hydrochloric acid, diluted 1 + 3. 7.1 Testportion 4.5 5 Hydrochloric acid, diluted 1 + 100. Weigh 1 to 2 g of the test sample into a platinum crucib