(ISo International Standard 4749 Copper alloys -- Determination of lead content - Flame atomic absorption spectrometric method Alliagesdecuivre--Dosageduplomb-Methodeparspectrométried'absorptionatomiquedanslaflamme First edition - 1984-03-15 ISO 4749-1984 (E) UDC 669.35 : 543.422 : 546.815 Ref. No. 1SO 4749-1984 (E) Descriptors : copper, copper alloys, chemicai analysis, determination of content, lead, atomic absorption method. Price based on 4 pages No reproduction or networking permited without license from IHS Not for Resale 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 forapproval before their acceptance as International Standardsby the Iso Council. International Standard ISO 4749 was developed by Technical Committee ISO/Tc 26, Copper and copper alloys, and was circulated to the member bodies in January 1982. It has been approved by the member bodies of the following countries : Australia France Poland Austria Germany, F. R. Romania Belgium Hungary Spain Brazil Italy Sweden Bulgaria Japan Switzerland Canada Korea, Dem. P. Rep. of Thailand China Korea, Rep.of Turkey Czechoslovakia Mexico USA Egypt, Arab Rep. of Netherlands Finland Norway The member bodies of the following countries expressed disapproval of the document on technical grounds : Chile South Africa, Rep. of C International Organization for Standardization, 1984 Printed in Switzerland Copyright Internaltional Organization for Standardizatior No reproduction or networking permitted without license from IHS Not for Resale ISO 4749-1984 (E) INTERNATIONALSTANDARD Copper alloys - Determination of lead content -- Flame atomic absorption spectrometric method Scope and field of application 3.2 Nitric acid, 1 + 1. This International Standard specifies a flame atomic absorption Dilute 100 ml of nitric acid, g 1,40 g/ml, with 100 ml of water. spectrometric method for the determination of the lead content of all types of copper alloys listed in International Standards. 3.3 Copper, 20 g/l base solution. The method is applicable to the determination of lead as alloy- Transfer 10,0 goflead-free copper(< 0,000 2 % Pb) toa600 ml ing element or impurity between 0,01 and 5,0 % (m/m). By polytetrafluorethylene, polyethylene, or low-pressure polypro- appropriate modification of sample mass, the lower limit may pylene beaker. Add 400 ml of the attack reagent (3.1), warm be extended to 0,002 % (m/m). until the copperis dissolved,then boil untilnitrousfumes have been expelled. In the case of polyethylene or polypropylene beakers,usea water bath forheating.Allowto cool and 2 Principle transfer the solution to a 500 ml one-mark volumetric flask. Dilute to the mark and mix. Dissolution of a test portion in fluoroboric-nitric acid mixture. 50 ml of this solution contains 1 g of copper and 40 ml of the Aspiration of the test solution into an air-acetylene flame, and fluoroboric-nitric acid mixture. determination of the lead content by spectrometric measure ment of the absorption of the 217,0 nm line emitted by a hollow-cathode lead lamp. 3.4 Lead, standard solution corresponding to 1,0 g of Pb per litre. 3 Reagents Weigh, to the nearest 0,001 g, 1,000 g of lead (purity 99,9 % minimum). Transfer to a 250 ml beaker. Add 20 ml of the nitric acid solution (3.2), cover, and warm gently until the lead is . During the analysis, use only reagents of recognized analytical dissolved. Boil the solution for a few minutes to expel nitrous grade and only distille