OSI 7627 /1 nternational Standard INTERNATIONAL ORGANiZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPAHM3AUWA nO CTAHAAPTW3AUMV+ORGANISATION INTE RNATIONALE DE NORMALISATION Hardmetals - Chemical analysis by flame atomic absorption spectrometry Part 1: General requirements Metaux-durs -- Analyse chimique par spectrometrie d'absorption atomique dans la flamme -- Partie 1: Caracteristiques generales First edition -- 1983-10-15 ISO 7627/1-1983 (E) UDC 669.018.25 : 643.422 Ref. No. ISO 7627/1-1983 (E) Descriptors : hardmetals, chemical analysis, generalities, atomic absorption spectrometry. Price based on 2 pages d without license from IHS NotforResal 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 and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the technicat committees are circulated to the: member bodies for approval before their acceptance as International Standards by the Iso Council. Internationa! Standard Iso 7627/1 was developed by Technical Committee ISO/TC 119, Powder metallurgy, and was circulated to the member bodies in 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 Norway China United Kingdom Czechoslovakia Poland USA Egypt, Arab Rep. of Romania USSR South Africa, Rep. of France No member body expressed disapproval of the document. International Organization for Standardization, 1983 Printed in Switzerland Copyright International Organization for Standardization from IHS ISO 7627/1-1983 (E) INTERNATIONAL STANDARD Hardmetals - Chemical analysis by flame atomic absorption spectrometry Part 1: General reguirements Scope NOTE - The method for the determination of chromium also permits 1 determination of iron, nickel, cobalt and manganese within the range 0,01 to 2 % (m/ m). This part of ISo 7627 lays down general requirements for the chemical analysis of hardmetals by flame atomic absorption. Principle Subsequent parts of this International Standard (see the table) specify methods for determination of the content of the follow- Dissolution of a test portion and determination by flame atomic ing elements by flame atomic absorption spectrometry. absorption spectrometry. calcium cobalt 4 Interfering elements chromium iron Effects of interference are minimized by using a similar matrix in potassium test and calibration solutions. magnesium manganese molybdenum 5 Reagents sodium nickel During the analysis, use only reagents of recognized analytical titanium grade and only double-distilled water or water of equivalent vanadium purity. 2 Field of application NOTE -- In certain cases, reagents of higher purity should be used. The method is applicable to 6 Apparatus a) carbides of chromium, niobium, tantalum, titanium, tungsten, vanadium, metry apparatus. b) mixtures of these carbides and binder metals, c) all grades of presintered or sintered hardmetals, pro- NOTE - All measurement parameters should be chosen to give duced from these carbides, optimum sensitivity. d) ' coated hardmetals, after totat removal of coating, Single-element hollow-cathode lamps are recommended. The recom- mended instrument requirements are shown in the relevant parts of with the elements shown in the table. this International Standard. Table -- Iso 7627 part number, elements and ranges covered in the relevant part Sampling Relevant part Range 7.1 If necessary, the sample may be crushed in a mortar Element of 1SO 7627 % (m/m) made of a material which does not alter the sample composi- 7627/2 Ca, K, Mg, Na 0,001 to 0,02 tion. If the sample contains lubricant, this shall be extracted 7627/3