International Standard (1SO 7627/3 Hardmetals - Chemical analysis by flame atomic absorption spectrometry Part 3: Determination of cobalt, iron, manganese and nickel in contents from 0,01 to 0,5 % (m/m) Metaux-durs -- Analyse chimique par spectrometrie d'absorption atomique dans la flamme - Partie 3: Dosage du cobalt, du fer, du manganese et du nickel a des teneurs comprises entre 0,01 et 0,5 % (m/ m) First edition -- 1983-10-15 ISO 7627/3-1983 (E) UDC 669.018.25 : 643.422 Ref. No. 1SO 7627/3-1983 (E) Price based on 2 pages Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (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 authorized 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 StandardISo 7627/3 was developed by Technical Committee ISO/TC 119, August 1982. It has been approved by the member bodies of the following countries : Austria Germany, F.R. Spain Brazil Italy Sweden Bulgaria Korea, Rep. of Switzerland China Norway United Kingdom Poland Czechoslovakia USA Egypt, Arab Rep. of Romania USSR France South Africa, Rep. of No member body expressed disapproval of the document @ International Organization for Standardization, 1983 Printed in Switzerland INTERNATIONAL STANDARD ISO 7627/3-1983 (E) Hardmetals -- Chemical analysis by flame atomic absorption spectrometry Part 3: Determination of cobalt, iron, manganese and nickel in contents from 0,01 to 0,5 % (m/m) 1 Scope and field of application 4.2 Dissolution of the test portion This part of ISO 7627 specifies the method to be used for the Add 10 ml of water, 5 ml of the hydrofluoric acid (3.1). and determination of cobalt, iron, manganese and nickel contents then 5 ml of the nitric acid (3.2), drop by drop, to the beaker of hardmetals within the range 0,01 to 0,5 % (m/ m) by flame containing the test portion (4.1) and heat gently until the test atomic absorption spectrometry. portion is completely dissolved. Add 10 ml of the caesium chloride solution (3.4) and 10 ml of the ammonium fluoride General requirements concerning the field of application, prin- solution (3.3). Then transfer the solution totally to a 100 mt ciple, interfering elements, apparatus, sampling and test report polypropylene one-mark volumetric flask and dilute to the are given in ISO 7627/1. mark. 2 Reference 4.3 Dilution volume ISo 7627/1, Hardmetals - Chemical analysis by flame atomic Prepare the relevant dilution volume for the analysis according absorption spectrometry - Part 1: General requirements. to table 1 as follows: 3 Reagents 4.3.1 Dilution volume 100 ml : use the solution in 4.2. 3.1 Hydrofluoric acid, 1,12 g/ml. 4.3.2 The concentration of the solution may be reduced by a 3.2 Nitric acid, Q 1,42 g/ml. factor of 10 for instruments of higher sensitivity by transferring 10 ml of the solution in 4.2 to a 100 ml polypropylene one-mark 3.3 Ammonium fluoride, 0,1 g/ml solution. volumetric flask. Add 10 ml of the caesium chloride solution (3.4). Add 10 ml of the ammonium fluoride solution (3.3) and dilute to the mark. Caesium chloride, 0,01 g/ml solution. 3.4 3.5 High-purity stock solutions, for calibration purposes for each element to be determined, containing 1,000 g of the 4.4 Preparation of calibration and blank solutions element per litre. NOTE - This value is understood to establish a maximum limit of 4.4.1 Prepare at least six solutions according to 4.2 with a 1,000 5 g and a minimum limit of 0,999 5 g. matrix composition as similar as possible to the test port