SIST EN 12441-7:2005

Zinc and zinc alloys - Chemical analysis - Part 7: Determination of tin - Flame atomic absorption spectrometric method after extraction

This document specifies a flame atomic absorption spectrometric method after extraction for the determination of tin in zinc and zinc alloys. It is applicable to the products specified in EN 988, EN 1179, EN 1774 and EN 12844.
It is suitable for the determination of tin contents (mass fractions) between 0,000 5 % and 0,005 %.

Zink und Zinklegierungen - Chemische Analyse - Teil 7: Bestimmung von Zinn - FAAS-Verfahren nach Extraktion

Dieses Dokument legt ein flammenatomabsorptionsspektrometrisches Verfahren (FAAS-Verfahren) für die
Bestimmung von Zinn in Zink und Zinklegierungen fest. Das Verfahren ist auf die in EN 988, EN 1179, EN 1774
und EN 12844 festgelegten Produkte anwendbar.
Es ist geeignet für die Bestimmung von Zinngehalten (Massenanteile) zwischen 0,000 5 % und 0,005 %.

Zinc et alliages de zinc - Analyse chimique - Partie 7: Dosage de l'étain - Méthode par spectrométrie d'absorption atomique dans la flamme apres extraction

La présente Norme européenne décrit une méthode d'analyse permettant de déterminer la teneur en étain du zinc et des alliages de zinc par spectrométrie d'absorption atomique apres extraction. Elle est applicable aux produits spécifiés dans les EN 988, EN 1179, EN 1774 et EN 12884.
Elle convient aux dosages de fractions massiques d'étain comprises entre 0,0005 % et 0,005 %.

Cink in cinkove zlitine – Kemična analiza – 7. del: Določevanje kositra – Metoda plamenske atomske absorpcijske spektrometrije po ekstrakciji

General Information

• Status: Published
• Publication Date: 28-Feb-2005
• ICS: 77.040.30 - Chemical analysis of metals
• ICS: 77.120.60 - Lead, zinc, tin and their alloys
• Technical Committee: INEK - Nonferrous metals
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2005
• Due Date: 01-Mar-2005
• Completion Date: 01-Mar-2005
• Ref Project: EN 12441-7:2004 - Zinc and zinc alloys - Chemical analysis - Part 7: Determination of tin - Flame atomic absorption spectrometric method after extraction

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zink und Zinklegierungen - Chemische Analyse - Teil 7: Bestimmung von Zinn - FAAS-Verfahren nach ExtraktionZinc et alliages de zinc - Analyse chimique - Partie 7: Dosage de l'étain - Méthode par spectrométrie d'absorption atomique dans la flamme apres extractionZinc and zinc alloys - Chemical analysis - Part 7: Determination of tin - Flame atomic absorption spectrometric method after extraction77.120.60Svinec, cink, kositer in njihove zlitineLead, zinc, tin and their alloys77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 12441-7:2004SIST EN 12441-7:2005en01-marec-2005SIST EN 12441-7:2005SLOVENSKI
STANDARD



SIST EN 12441-7:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12441-7December 2004ICS 77.040.30; 77.120.60English versionZinc and zinc alloys - Chemical analysis - Part 7: Determinationof tin - Flame atomic absorption spectrometric method afterextractionZinc et alliages de zinc - Analyse chimique - Partie 7:Dosage de l'étain - Méthode par spectrométrie d'absorptionatomique dans la flamme après extractionZink und Zinklegierungen - Chemische Analyse - Teil 7:Bestimmung von Zinn - FAAS-Verfahren nach ExtraktionThis European Standard was approved by CEN on 4 November 2004.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, 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© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12441-7:2004: ESIST EN 12441-7:2005



EN 12441-7:2004 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Principle.4 5 Reagents.4 6 Apparatus.6 7 Sampling.6 8 Procedure.6 9 Calculation and expression of results.7 10 Test report.8 Annex A (informative)
Additional information on international co-operative tests.9 Annex B (informative)
Graphical representation of precision data.10 Bibliography.11
SIST EN 12441-7:2005



EN 12441-7:2004 (E) 3 Foreword This document (EN 12441-7:2004) has been prepared by Technical Committee CEN/TC 209 “Zinc and zinc alloys”, the secretariat of which is held by AFNOR. 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 June 2005, and conflicting national standards shall be withdrawn at the latest by June 2005. Within its programme of work, Technical Committee CEN/TC 209 entrusted CEN/TC 209/WG6 "Methods of analysis and testing" to prepare the following document: EN 12441-7, Zinc and zinc alloys – Chemical analysis – Part 7: Determination of tin – Flame atomic absorption spectrometric method after extraction. This standard is a part of a series of eleven standards. The other standards are:  Part 1: Determination of aluminium in zinc alloys – Titrimetric method  Part 2: Determination of magnesium in zinc alloys – Flame atomic absorption spectrometric method  Part 3: Determination of lead, cadmium and copper – Flame atomic absorption spectrometric method  Part 4: Determination of iron in zinc alloys – Spectrophotometric method  Part 5: Determination of iron in primary zinc – Spectrophotometric method  Part 6: Determination of aluminium and iron – Flame atomic absorption spectrometric method  Part 8: Determination of tin in secondary zinc – Flame atomic absorption spectrometric method  Part 9: Determination of nickel in zinc alloys – Flame atomic absorption spectrometric method  Part 10: Determination of chromium and titanium in zinc alloys – Spectrophotometric method  Part 11: Determination of silicon in zinc alloys – Spectrophotometric 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 12441-7:2005



EN 12441-7:2004 (E) 4 1 Scope This document specifies a flame atomic absorption spectrometric method after extraction for the determination of tin in zinc and zinc alloys. It is applicable to the products specified in EN 988, EN 1179, EN 1774 and EN 12844. It is suitable for the determination of tin contents (mass fractions) between 0,000 5 % and 0,005 %. 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. EN 988, Zinc and zinc alloys – Specifications for rolled flat products for building EN 1179, Zinc and zinc alloys – Primary zinc EN 1774, Zinc and zinc alloys – Alloys for foundry purposes – Ingot and liquid EN 12060:1997, Zinc and zinc alloys – Method of sampling – Specifications EN 12844, Zinc and zinc alloys – Castings – Specifications 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12060:1997 and the following apply. 3.1 atomic absorption spectrometry measurement of the absorption of an electromagnetic radiation, emitted by an element at a determined wavelength, by an absorbent medium (flame) formed by atoms of the same element that are in the ground state. Each element absorbs radiation of specific wavelengths and the intensity of the absorbed radiation is proportional to the concentration of said element 4 Principle A sample of the metal or alloy is dissolved in hydrochloric acid. Tin is extracted in organic phase using an iso-butyl acetate solution of trioctylphosphine oxyde (T.O.P.O.). The content of tin is determined by atomic absorption spectrometry at the wavelength of 286,3 nm, after direct nebulization of the organic phase. 5 Reagents 5.1 General During the test, use only reagents of known analytical grade and distilled or demineralised water. 5.2 Hydrochloric acid, ρ = 1,19 g/ml SIST EN 12441-7:2005



EN 12441-7:2004 (E) 5 5.3 Hydrogen peroxide, 30 % (mass fraction) Hydrogen peroxide solutions are liable to be stabilised with products containing tin. Therefore exactly the same volume of hydrogen peroxide shall be used both when dissolving samples and when preparing the calibration solutions. 5.4 Iso-butyl acetate
5.5 Tri-n-octylphosphinoxide (T.O.P.O.), 10 g/l solution In a 200 ml volumetric flask, dissolve 2 g of tri-n-octylphosphinoxide in iso-butyl acetate (5.4).
Dilute to the mark with iso-butyl acetate (5.4) and mix. 5.6 Pure zinc 99,995 %, tin free 5.7 Zinc solution, 200 g/l solution Introduce 200 g of zinc (5.6) into a 2 litre beaker. Add 700 ml of hydrochloric acid (5.2) carefully in small amounts to control the rate of reaction.
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