SIST EN 12441-10:2005

Zinc and zinc alloys - Chemical analysis - Part 10: Determination of chromium and titanium in zinc alloys - Spectrophotometric method

This document specifies a spectrophotometric method for the determination of chromium and titanium in zinc alloys. It is applicable to the products specified in EN 988, EN 1774 and EN 12844.
It is suitable for the determination of chromium and titanium contents (mass fractions) between 0,05 % and 0,50 %.

Zink und Zinklegierungen - Chemische Analyse - Teil 10: Bestimmung von Chrom und Titan in Zinklegierungen - Spektrophotometrisches Verfahren

Dieses Dokument legt ein spektrophotometrisches Verfahren für die Bestimmung von Chrom und Titan in Zinkle-
gierungen fest. Das Verfahren ist auf die in EN 988, EN 1774 und EN 12844 festgelegten Produkte anwendbar.
Es ist geeignet für die Bestimmung von Chrom- und Titangehalten (Massenanteil) zwischen 0,05 % und 0,50 %.

Zinc et alliages de zinc - Analyse chimique - Partie 10: Dosage du chrome et du titane dans les alliages de zinc - Méthode spectrophotométrique

Ce document décrit une méthode d?analyse permettant de déterminer la teneur en chrome et en titane des
alliages de zinc, par spectrophotométrie. Elle est applicable aux produits spécifiés dans les EN 988, EN 1774
et EN 12844.
Elle convient au dosage de fractions massiques de chrome et de titane comprises entre 0,05 % et 0,50 %.

Cink in cinkove zlitine – Kemična analiza – 10. del: Določevanje kroma in titana v cinkovih zlitinah – Metoda spektrofotometrije

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 12441-10:2004 - Zinc and zinc alloys - Chemical analysis - Part 10: Determination of chromium and titanium in zinc alloys - Spectrophotometric method

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zink und Zinklegierungen - Chemische Analyse - Teil 10: Bestimmung von Chrom und Titan in Zinklegierungen - Spektrophotometrisches VerfahrenZinc et alliages de zinc - Analyse chimique - Partie 10: Dosage du chrome et du titane dans les alliages de zinc - Méthode spectrophotométriqueZinc and zinc alloys - Chemical analysis - Part 10: Determination of chromium and titanium in zinc alloys - Spectrophotometric method77.120.60Svinec, cink, kositer in njihove zlitineLead, zinc, tin and their alloys77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 12441-10:2004SIST EN 12441-10:2005en01-marec-2005SIST EN 12441-10:2005SLOVENSKI
STANDARD



SIST EN 12441-10:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12441-10December 2004ICS 77.040.30; 77.120.60English versionZinc and zinc alloys - Chemical analysis - Part 10: Determinationof chromium and titanium in zinc alloys - SpectrophotometricmethodZinc et alliages de zinc - Analyse chimique - Partie 10:Dosage du chrome et du titane dans les alliages de zinc -Méthode spectrophotométriqueZink und Zinklegierungen - Chemische Analyse - Teil 10:Bestimmung von Chrom und Titan in Zinklegierungen -Spektrophotometrisches VerfahrenThis 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 12441-10:2004: ESIST EN 12441-10:2005



EN 12441-10:2004 (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.8 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.12
SIST EN 12441-10:2005



EN 12441-10:2004 (E) 3 Foreword This document (EN 12441-10:2004) 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 12441-10, Zinc and zinc alloys – Chemical analysis – Part 10: Determination of chromium and titanium in zinc alloys – Spectrophotometric method This document is a part of a series of eleven standards. The other documents 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 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 12441-10:2005



EN 12441-10:2004 (E) 4 1 Scope
This document specifies a spectrophotometric method for the determination of chromium and titanium in zinc alloys. It is applicable to the products specified in EN 988, EN 1774 and EN 12844. It is suitable for the determination of chromium and titanium contents (mass fractions) between 0,05 % and 0,50 %. 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 document, the terms and definitions given in EN 12060:1997 apply. 4 Principle For both determinations the same dissolution and oxidation step is used. Chromium is determined by spectrophotometry of the violet chromium diphenylcarbazide complex. Titanium is determined by spectrophotometry of the red chromotropic acid titanium complex, formed in a solution buffered at pH 2,9. 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 5.3 Nitric acid, ρ = 1, 4 g/ml 5.4 Perchloric acid, ρ = 1,6 g/ml 5.5 Sulphuric acid, ρ = 1,83 g/ml 5.6 Chloroacetic acid 5.7 Sodium hydroxide SIST EN 12441-10:2005



EN 12441-10:2004 (E) 5 5.8 Sulphuric acid, (1+1) Carefully add 1 part volume of sulphuric acid (5.5) to 1 part volume of water. 5.9 Sulphuric acid, 2M Carefully pour 110 ml of sulphuric acid (5.5) into water and dilute to a final volume of 1 litre. 5.10 Aqua regia Mix 3 part volumes of hydrochloric acid (5.2) with 1 part volume of nitric acid (5.3). 5.11 Pure titanium 5.12 Titanium oxalate potassium, pure and dry [K2TiO(COO)4] 2H2O 5.13 Chromotropic acid, 60 g/l (fresh solution) 5.14 Buffer solution, pH 2,9 (fresh solution) Dissolve separately in 600 ml beakers, each with about 400 ml of water:  236 g of chloracetic acid (5.6);  50 g of sodium hydroxide (5.7). Transfer both solutions quantitatively to a 1 litre volumetric flask. Dilute to the mark with water and mix. 5.15 Ascorbic acid, 20 g/l (fresh solution) 5.16 Titanium, 1 g/l standard solution Introduce either 1,848 g of titanium oxalate potassium (5.12), either 0,250 g of pure titanium (5.11), weighted to the nearest 0,001 g, into a 400 ml beaker. Add 50 ml of sulphuric acid (5.8). Heat gently to complete dissolution. Cool to room temperature and transfer to a 250 ml volumetric flask. Dilute to the mark with water and mix. 1 ml of this solution contains 1 mg of titanium. 5.17 Titanium, 25 mg/l standard solution (fresh solution
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