0ISO2354 NTERNATIONAL STANDARD NTERNATIONAL ORGANiZATION FGR STANDARDIZATiON·MEK.I>HAPO.IHA OPFAHM3ALIHA O CTAHIAPTW3ALIWH·ORGANISATION INTERNATIONALE DE NORMALISATION Magnesium alloys -- Determination of insoluble zirconium - Alizarin sulphonate photometric method Alliages de magnesium - Dosage du zirconium insoluble -- Methode photométrique a I'alizarine sulfonate Second edition - 1976-04-01 ISO 2354-1976 (E) UDC 669.721 : 546.831 Ref.No.1SO 2354-1976 (E) Descriptors agnesium alloys,zirconium-containingalloys,chemical analysis,determinationof content,zirconium,photometry Price based on 4 pages FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (isO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject fcr which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in iaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the Iso Council. ISO 2354' was drawn up by Technical Committee ISO/TC 79, Light metals and their alloys. This second edition contains the note, added at the end of clause 1, which was circulated in November 1975, in the form of an Addendum, directly to the isO Council, in accordance with clause 6.12.1 of the Directives for the technicalworkofISO This second edition cancels and replaces the first edition (i.e. ISO 2354-1972), which had been approved by the Member Bodies of the following countries : Austria Ireland South Africa, Rep.of Belgium Israel Spain Canada Italy Sweden Egypt, Arab Rep. of Japan Switzeriand Finland Netherlands Thailand France New Zealand United Kingdom Germany Norway U.S.A. India Poland U.S.S.R. No Member Body had expressed disapproval of the document . International Organization for Standardization, 1976 Printed in Switzerland ISO 2354-1976 (E) INTERNATIONAL STANDARD Magnesium alloys -- Determination of insoluble zirconium -- Alizarin sulphonate photometric method 1 SCOPEANDFIELDOFAPPLICATION 3.5 Magnesium chloride, 420 g/1 solution. This International Standard specifies an alizarin sulphonate Dissolve 42 g of magnesium chloride hexahydrate photometric method for the determination of insoluble (MgCl2.6H20) in water, make up the volume to 100 ml zirconium in magnesium alloys containing zirconium as an and mix. alloying element. This solution contains 50 g of magnesium per litre. Rare earths, thorium and silver do not interfere. The method is applicable to alloys having insoluble 3.6 Zirconium, 5 g/l standard solution. zirconium contents between 0,02 and 0,3 % (m/m). Prepare this solution according to one of the following NOTE -- Hafnium which is normally present in conjunction with procedures : zirconium (up to 1 % zirconium) witl be determined with zirconium. 3.6.1 Weigh, to the nearest 0,001 g, 0,500 g of pure 2 PRINCIPLE zirconium (purity ≥ 99,9 %) and transfer to a dry beaker. Add 30 ml of methanol and, while cooling, 5 ml of Hydrochloric acidattack (thenormality of the bromine. When the reaction has ceased, heat gentiy to hydrochloric acid and the length of the attack have been complete the attack. Add 20 ml of the hydrochioric acid conventionally fixed). (3.1), heat to boiling and continue boiling until a colourless solution is obtained, maintaining the volume of the solution Filtration, dissolution ofthe insoluble residue in atapproximately50mlbyaddingwater. perchloric acid in the presence of hydrofluoric acid, and taking of an aliquot. Cool, transfer quantitatively to a 100 ml volumetric fiask, zirconium-alizarin make up to volume and mix. Formation, when hot, of the sulphonate complex, in 1,5 N hydrochloric medium. 3.6.2 Disslove 1,77 g of zirconium ox