SIST EN 12441-11:2006

Zinc and zinc alloys - Chemical analysis - Part 11: Determination of silicon in zinc alloys - Spectrophotometric method

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 %.

Zink und Zinklegierungen - Chemische Analyse - Teil 11: Bestimmung von Silicium in Zinklegierungen - Spektrophotometrisches Verfahren

Dieses Dokument legt ein spektrophotometrisches Verfahren für die Bestimmung von Silicium in Zinklegie-rungen
fest. Das Verfahren ist auf die in EN 1774 und EN 12844 festgelegten Produkte anwendbar.
Es ist geeignet für die Bestimmung von Siliciumgehalten (Massenanteile) zwischen 0,01 % und 0,1 %.

Zinc et alliages de zinc - Analyse chimique - Partie 11 : Dosage du silicium dans les alliages de zinc - Méthode spectrophotométrique

Cink in cinkove zlitine – Kemična analiza – 11. del: Določevanje silicija v cinkovih zlitinah - Spektrofotometrijska analiza

General Information

• Status: Published
• Publication Date: 31-Oct-2006
• 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-Nov-2006
• Due Date: 01-Nov-2006
• Completion Date: 01-Nov-2006
• Ref Project: EN 12441-11:2006 - Zinc and zinc alloys - Chemical analysis - Part 11: Determination of silicon in zinc alloys - Spectrophotometric method

Overview

EN 12441-11:2006 - Zinc and zinc alloys: Determination of silicon in zinc alloys (spectrophotometric method) - is a CEN standard that specifies a validated laboratory procedure for measuring silicon in zinc alloys. The method is based on formation and spectrophotometric measurement of the silicomolybdenum blue complex after dissolution of the sample in hydrochloric and hydrofluoric acid. It is applicable to products covered by EN 1774 and EN 12844 and is suitable for silicon mass fractions in the range 0.01 % to 0.1 %.

Key Topics

• Principle: Direct spectrophotometric measurement of silicomolybdenum blue at 820 nm.
• Scope & range: Designed for silicon contents (mass fraction) between 0.01 % and 0.1 % in zinc alloys.
• Sample preparation: Typical test portion is 1 g; dissolution in HCl and HF, followed by dilution and reagent additions to develop the colored complex.
• Reagents & solutions: Includes specific reagent requirements (bidistilled water, HCl, HF, boric acid, ammonium molybdate, reducing solution, silicon standard prepared from ammonium hexafluoro-silicate).
• Apparatus: Use of polymeric labware (PTFE/PP/PE), spectrophotometer (1 cm cells) set to 820 nm, magnetic stirring and clean vessels (HF cleaning for new items).
• Calibration & calculation: Calibration curve prepared from silicon standards; absorbance-to-Si content conversion and expression as % mass fraction.
• Quality & precision: Inter-laboratory precision data and repeatability/reproducibility assessment are provided (statistically treated per ISO 5725).

Applications

• Quality control and chemical analysis laboratories in zinc production, foundries and casting operations.
• Verification of alloy composition for compliance with EN 1774 (alloys for foundry) and EN 12844 (castings).
• Routine monitoring of silicon levels during alloy formulation, process control and incoming material inspection.
• Useful for regulatory compliance, supplier certification and material traceability where accurate low-level silicon determination is required.

Who should use it

• Metallurgical and analytical chemists, QA/QC laboratories, foundry labs, certification bodies and testing organisations engaged in zinc alloy specification and control.

Related standards

• EN 1774, EN 12060 (sampling), EN 12844
• Series: EN 12441 parts 1–10 (other chemical analysis methods for Zn alloys)
• ISO 5725 (accuracy, repeatability and reproducibility)

This standard provides a reproducible, documented spectrophotometric procedure for low-level silicon analysis in zinc alloys, supporting consistent alloy quality control and compliance with European product specifications.

Standards Content (Sample)

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

Additional information on international co-operative tests.8 Annex B (informative)
Graphical representation of precision data.9 Bibliography.10

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 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
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