EN 14936-2:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Copper and copper alloys - Determination of aluminium content - Part 2: FAAS methodCuivre et alliages de cuivre - Dosage de l'aluminium - Partie 2 : Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)Kupfer und Kupferlegierungen - Bestimmung des Aluminiumgehaltes - Teil 2: Flammenatomabsorptionsspektrometrisches Verfahren (FAAS)Ta slovenski standard je istoveten z:EN 14936-2:2006SIST EN 14936-2:2006en77.120.30ICS:SLOVENSKI
STANDARDSIST EN 14936-2:200601-september-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14936-2June 2006ICS 77.120.30 English VersionCopper and copper alloys - Determination of aluminium content -Part 2: FAAS methodCuivre et alliages de cuivre - Dosage de l'aluminium -Partie 2 : Méthode par spectrométrie d'absorption atomiquedans la flamme (SAAF)Kupfer und Kupferlegierungen - Bestimmung desAluminiumgehaltes - Teil 2:Flammenatomabsorptionsspektrometrisches Verfahren(FAAS)This European Standard was approved by CEN on 15 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14936-2:2006: E

Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Principle.4 4 Reagents and materials.4 5 Apparatus.5 6 Sampling.5 7 Procedure.5 8 Expression of results.9 9 Precision.10 10 Test report.10 Bibliography.11

3 Foreword This document (EN 14936-2:2006) has been prepared by Technical Committee CEN/TC 133 “Copper and copper alloys”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2006, and conflicting national standards shall be withdrawn at the latest by December 2006. Within its programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 10 "Methods of analysis" to prepare the following standard: EN 14936-2, Copper and copper alloys — Determination of aluminium content — Part 2: FAAS method This is one of two parts of the standard for the determination of aluminium content in copper and copper alloys. The other part is: EN 14936-1, Copper and copper alloys — Determination of aluminium content — Part 1: Titrimetric method According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

1 Scope This part of this European Standard specifies a flame atomic absorption spectrometric method (FAAS) for the determination of the aluminium content of copper and copper alloys in the form of unwrought, wrought and cast products. The method is applicable to products having aluminium mass fractions between 0,010 % and 2,5 %. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1811-1, Copper and copper alloys — Selection and preparation of samples for chemical analysis — Part 1: Sampling of cast unwrought products ISO 1811-2, Copper and copper alloys — Selection and preparation of samples for chemical analysis — Part 2: Sampling of wrought products and castings NOTE Informative references to documents used in the preparation of this standard, and cited at the appropriate places in the text, are listed in the Bibliography. 3 Principle Dissolution of a test portion in aqua regia followed, after suitable dilution, by aspiration into a nitrous oxide/ acetylene flame of an atomic absorption spectrometer. Measurement of the absorption of the 309,3 nm line emitted by an aluminium hollow-cathode lamp. 4 Reagents and materials 4.1 General During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.2 Hydrochloric acid, HCl (ρ = 1,19 g/ml). 4.3 Hydrochloric acid solution, 1 + 1 Dilute 500 ml of hydrochloric acid (4.2) in 500 ml of water. 4.4 Nitric acid, HNO3 (ρ = 1,40 g/ml). 4.5 Nitric acid solution, 1 + 1 Dilute 500 ml of nitric acid (4.4) in 500 ml of water. 4.6 Aluminium stock solution, 1,000 g/l Al Weigh (1 ± 0,001) g of aluminium (Al ≥ 99,9 %) and dissolve it in 50 ml of the hydrochloric acid solution (4.3). Transfer the solution into a 1 000 ml one-mark volumetric flask. Dilute to the mark with water and mix well. 1 ml of this solution contains 1,000 mg of Al.

5 4.7 Aluminium standard solution, 0,050 g/l Al Transfer 10,0 ml of the aluminium stock solution (4.6) into a 200 ml one-mark volumetric flask. Dilute to the mark with water and mix well. Prepare this solution immediately prior to use. 1 ml of this solution contains 0,050 mg of Al. 4.8 Aluminium standard solution, 0,200 g/l Al Transfer 20,0 ml of the aluminium stock solution (4.6) into a 100 ml one-mark volumetric flask. Dilute to the mark with water and mix well. Prepare this solution immediately prior to use. 1 ml of this solution contains 0,200 mg of Al. 4.9 Copper base solution, 50 g/l Cu Weigh 25,0 g of aluminium-free copper (Cu ≥ 99,95 %) and transfer it into an 800 ml beaker. Add 125 ml of hydrochloric acid (4.2) and, cautiously, 250 ml of nitric acid solution (4.5). Cover with a watch glass and heat gently until the copper is completely dissolved, then continue heating to the boiling point. Cool to room temperature. Wash the beaker cover and the sides of the beaker with water. Transfer the solution quantitatively into a 500 ml one-mark volumetric flask, dilute to the mark with water and mix well. 4.10
Copper base solution, 10 g/l Cu Transfer 40,0 ml of the copper base solution (4.9) into a 200 ml one-mark volumetric flask. Add 45 ml of hydrochloric acid (4.2) and 90 ml of nitric acid solution (4.5). Dilute to the mark with water and mix well. 5 Apparatus 5.1 Ordinary laboratory apparatus. 5.2 Atomic absorption spectrometer, fitted with a nitrous oxide/acetylene burner. 5.3 Aluminium hollow-cathode lamp. 6 Sampling Sampling shall be carried out in accordance with ISO 1811-1 or ISO 1811-2, as appropriate. Test samples shall be in the form of fine drillings, chips or millings with a maximum thickness of 0,5 mm. 7 Procedure 7.1 Preparation of the test portion solution 7.1.1 Test portion Weigh (1 ± 0,001) g of the test sample.

7.1.2 Aluminium mass fractions between 0,01 % and 0,10 % Transfer the test portion (7.1.1) into a 250 ml beaker. Add 5 ml of the hydr
...