SIST EN 12441-11:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zinc and zinc alloys - Chemical analysis - Part 11: Determination of silicon in zinc alloys - Spectrophotometric methodZinc et alliages de zinc - Analyse chimique - Partie 11 : Dosage du silicium dans les alliages de zinc - Méthode spectrophotométriqueZink und Zinklegierungen - Chemische Analyse - Teil 11: Bestimmung von Silicium in Zinklegierungen - Spektrophotometrisches VerfahrenTa slovenski standard je istoveten z:EN 12441-11:2006SIST EN 12441-11:2006en77.120.6077.040.30ICS:SLOVENSKI
STANDARDSIST EN 12441-11:200601-november-2006







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12441-11August 2006ICS 77.120.60 English VersionZinc and zinc alloys - Chemical analysis - Part 11: Determinationof silicon in zinc alloys - Spectrophotometric methodZinc et alliages de zinc - Analyse chimique - Partie 11 :Dosage du silicium dans les alliages de zinc - MéthodespectrophotométriqueZink und Zinklegierungen - Chemische Analyse - Teil 11:Bestimmung von Silicium in Zinklegierungen -Spektrophotometrisches VerfahrenThis European Standard was approved by CEN on 7 July 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 12441-11:2006: E



EN 12441-11:2006 (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.5 7 Sampling.5 8 Procedure.5 9 Calculation and expression of results.6 10 Test report.7 Annex A (informative)
Additional information on international co-operative tests.8 Annex B (informative)
Graphical representation of precision data.9 Bibliography.10



EN 12441-11:2006 (E) 3 Foreword This document (EN 12441-11:2006) 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 February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. 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 12441-11, Zinc and zinc alloys – Chemical analysis – Part 11: Determination of silicon in zinc alloys – Spectrophotometric method. 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 7: Determination of tin – Flame atomic absorption spectrometric method after extraction  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 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.



EN 12441-11:2006 (E) 4 1 Scope This European Standard specifies a spectrophotometric method for the determination of silicon in zinc alloys. It is applicable to the products specified in EN 1774 and EN 12844. It is suitable for the determination of silicon contents (mass fractions) between 0,01 % and 0,1 %. 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 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 European Standard, the terms and definitions given in EN 12060:1997 apply. 4 Principle Direct spectrophotometric determination of silicomolybdenum blue after dissolution of the sample in hydrochloric and hydrofluoric acid. 5 Reagents 5.1 General During the test, use only reagents of known analytical grade. 5.2 Bidistilled water (for preparation and dilution of all solutions) 5.3 Hydrochloric acid, ρ = 1,19 g/ml 5.4 Hydrofluoric acid, ρ = 1,13 g/ml 5.5 Boric acid 5.6 Ammonium molybdate (NH4)6Mo7O24 . 4H2O 5.7 Sodium metabisulfite Na2S2O5 5.8 Sodium sulfite Na2SO3 5.9 1-amino-2-naphtol-4-sulfonic acid



EN 12441-11:2006 (E) 5 5.10 Molybdate solution Dissolve 100 g of boric acid (5.6) in 3 litres of water and dissolve 25 g of ammonium molybdate (NH4)6Mo7O24 . 4H2O in 250 ml of water. Transfer both solutions into a 5 litre volumetric flask. Dilute to the mark with water and mix. 5.11 Reducing solution Dissolve 100 g of Na2S2O5 (5.7) in 600 ml of tepid water (fraction 1) and 4 g of Na2SO3 (5.8) in 40 ml of tepid water (fraction 2). Introduce 2 g of 1-amino-2-naphtol-4-sulfonic acid (5.9) in 40 ml of tepid water (fraction 3) and mix. Add fraction 2 to fraction 3 and mix until the solution is clear. Dilute with fraction 1. Transfer to a 1 l volumetric flask. Dilute to the mark with water and mix. 5.12 Silicon standard solution In hot water dissolve, 0,6 342 g of
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