SIST EN 14939:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Copper and copper alloys - Determination of beryllium content - FAAS methodCuivre et alliages de cuivre - Dosage du béryllium - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)Kupfer und Kupferlegierungen - Bestimmung des Berylliumgehaltes - Flammenatomabsorptionsspektrometrisches Verfahren (FAAS)Ta slovenski standard je istoveten z:EN 14939:2006SIST EN 14939:2006en77.120.30ICS:SLOVENSKI
STANDARDSIST EN 14939:200601-september-2006







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14939June 2006ICS 77.120.30 English VersionCopper and copper alloys - Determination of beryllium content -FAAS methodCuivre et alliages de cuivre - Dosage du béryllium -Méthode par spectrométrie d'absorption atomique dans laflamme (SAAF)Kupfer und Kupferlegierungen - Bestimmung desBerylliumgehaltes -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 14939:2006: E



EN 14939:2006 (E) 2
Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Principle.4 4 Reagents and materials.4 5 Apparatus.5 6 Sampling.6 7 Procedure.6 8 Expression of results.9 9 Precision.10 10 Test report.11 Bibliography.12



EN 14939:2006 (E)
3 Foreword This document (EN 14939:2006) has been prepared by Technical Committee CEN/TC 133 “Copper and copper al-loys”, 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 14939, Copper and copper alloys — Determination of beryllium content — FAAS method According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Esto-nia, 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.



EN 14939:2006 (E) 4
1 Scope This European Standard specifies a flame atomic absorption spectrometric method (FAAS) for the determination of the beryllium content of copper and copper alloys in the form of unwrought, wrought and cast products. The method is applicable to products having beryllium mass fractions between 0,01 % and 3,0 %. 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 hydrochloric/nitric acid mixture followed, after suitable dilution, by aspiration into a ni-trous oxide/acetylene flame of an atomic absorption spectrometer. Measurement of the absorption of the 234,8 nm line emitted by a beryllium hollow-cathode lamp. 4 Reagents and materials WARNING — Beryllium is an extremely poisonous metal and the inhalation of dust can cause cancer. 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 1 000 ml of hydrochloric acid (4.2) in 1 000 ml of water. 4.4 Nitric acid, HNO3 (ρ = 1,40 g/ml). 4.5 Nitric acid solution, 1 + 1 Dilute 1 000 ml of nitric acid (4.4) in 1 000 ml of water.



EN 14939:2006 (E)
5 4.6 Beryllium stock solution, 1,000 g/l Be Weigh (1 ± 0,001) g of beryllium (Be ≥ 99,9 %) and transfer it into a 250 ml beaker. Add 20 ml of hydrochloric acid (4.2). Cover and heat gently until the beryllium is completely dissolved. Cool to room temperature, transfer the solu-tion quantitatively 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 Be. 4.7 Beryllium standard solution, 0,010 g/l Be Transfer 5,0 ml of the beryllium stock solution (4.6) into a 500 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 0,010 mg of Be. 4.8 Beryllium standard solution, 0,005 g/l Be Transfer 50,0 ml of the beryllium standard solution (4.7) 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 0,005 mg of Be. 4.9 Copper base solution, 5 g/l Cu Weigh (5 ± 0,001) g of beryllium-free copper (Be ≤ 0,001 5 %) and transfer it into a 400 ml beaker. Add 50 ml of hydrochloric acid solution (4.3) and, cautiously, 50 ml of nitric acid solution (4.5). Heat gently until the copper is dis-solved and then bring to the boiling point until the nitrous fumes have been expelled. Cool to room temperature, transfer the solution quantitatively into a 1 000 ml one-mark volumetric flask, dilute to the mark with water and mix well. 1 ml of this solution contains 5 mg of Cu. 4.10 Copper base solution, 1 g/l Cu Transfer 50,0 ml of the copper base solution (4.9) into a 250 ml one-mark volumetric flask. Dilute to the mark with water and mix well. 1 ml of this solution contains 1 mg of Cu. 5 Apparatus 5.1 Ordinary laboratory apparatus. 5.2 Atomic absorption spectrometer, fitted with a nitrous oxide/acetylene burner. 5.3 Beryllium hollow-cathode lamp.



EN 14939:2006 (E) 6
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 Test portion solution Transfer the test portion (7.1.1) into a 250 ml beaker. Add 10 ml of hydrochloric acid (4.2) and 10 ml of the nitric acid solution (4.5). Cover with a watch glass and heat gently until the test portion is completely dissolved, then heat at a temperature of approximately 90 °C until brown fumes have been expelled. Allow to cool. Wash the beaker cover and the sides of the beaker with water. Transfer the dissolved test portion into a 100 ml one-mark volumetric flask. Dilute to the mark with water and mix well. 7.1.3 Beryllium mass fractions between 0,01 % and 0,10 % Transfer 10 ml of the test portion solution (7.1.2) into a 100 ml one-mar
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