Nickel, ferronickel and nickel alloys - Determination of sulphur content - Iodometric titration method after induction furnace combustion (ISO 7527:1985)

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Nickel, Ferronickel und Nickellegierung - Bestimmung des Schwefelgehaltes - Iodometrisches Titrationsverfahren nach Verbrennung im Induktionsofen (ISO 7527:1985)

Nickel, ferro-nickel et alliages de nickel - Dosage du soufre - Méthode par titration iodométrique après combustion dans un four à induction (ISO 7527:1985)

La présente Norme internationale spécifie une méthode titrimétrique après combustion, pour le dosage du soufre à des teneurs comprises entre 0,001 et 0,3 % (m/m) dans le nickel et le ferro-nickel et à des teneurs comprises entre 0,002 et 0,1 % (m/m) dans les alliages de nickel. Des exemples de composition sont donnés dans l'annexe.

Nikelj, feronikelj in nikljeve zlitine - Določevanje žvepla - Jodometrijska titracijska metoda po zgorevanju v indukcijski peči (ISO 7527:1985)

General Information

Status
Published
Publication Date
05-Nov-1991
Withdrawal Date
05-May-1992
Technical Committee
Drafting Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
13-Oct-1999
Completion Date
13-Oct-1999

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EN 27527:2009
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nickel, Ferronickel und Nickellegierung - Bestimmung des Schwefelgehaltes - Iodometrisches Titrationsverfahren nach Verbrennung im Induktionsofen (ISO 7527:1985)Nickel, ferro-nickel et alliages de nickel - Dosage du soufre - Méthode par titration iodométrique après combustion dans un four à induction (ISO 7527:1985)Nickel, ferronickel and nickel alloys - Determination of sulphur content - Iodometric titration method after induction furnace combustion (ISO 7527:1985)77.120.40Nikelj, krom in njune zlitineNickel, chromium and their alloysICS:Ta slovenski standard je istoveten z:EN 27527:1991SIST EN 27527:2009en,de01-november-2009SIST EN 27527:2009SLOVENSKI
STANDARD



SIST EN 27527:2009



SIST EN 27527:2009



SIST EN 27527:2009



International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEIKflYHAPO,QHAR OPI-AHM3AL&lR fl0 CTAH~APTM3AL&WWORGANISATION INTERNATIONALE DE NORMALISATION Nickel, ferronickel and nicke1 alloys - Determination of Sulfur content - lodimetric titration method after induction furnace combustion Nickel, ferro-nicke1 et alliages de nicke/ - Dosage du soufre - AMhode par titrage iodomhtrique apr&s combustion dans un four 6 induc tion First edition - 1985-12-15 UDC 669.24 : 543.242.3 : 543.645 Ref. No. ISO 7527-1985 (E) Descriptors : nickel, nicke1 alloys, ferronickel, Chemical analysis, determination of content, sulphur, volumetric analysis. Price based on 7 pages SIST EN 27527:2009



Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bedies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7527 was prepared by Technical Committee ISO/TC 155, Nickel and nicke/ alloys. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its Jatest edition, unless otherwise stated. 0 International Organization for Standardization, 1985 Printed in Switzerland SIST EN 27527:2009



INTERNATIONAL STANDARD ISO 75274985 (E) Nickel, ferronickel and nicke1 alloys - Determination of Sulfur content - lodimetric titration method after induction furnace combustion 1 Scope and field of application This International Standard specifies a titrimetric method after combustion for the determination of the Sulfur content of nicke1 and ferronickel in the range 0,001 to 0,3 % (mlm), and of nicke1 alloys in the range 0,002 to 0,l % (mlm). Examples of compositions are given in the annex. 2 References ISO 38511, Laboratory glassware - Burettes - Part 7: General requiremen ts. ISO 648, Laboratory glassware - One-mark pipettes. I S 0 1042, Labora tot-y glassware - One-mark volume tric flasks. ISO 5725, Precision of test methods - Determination of repea tability and reproducibility b y in ter-labora tot-y tes ts. ISO 7525, Nickel - Determination of Sulfur content - Methylene blue molecular absorption spectrometric method a fter genera tion o f h ydrogen sulfide. 3 Principle Combustion of a test Portion in a flow of Oxygen at a high temperature in a high frequency induction furnace in the presence of fluxes and accelerators. Absorption of the Sulfur dioxide formed in an acidified starch- iodide Solution and continuous titration with potassium iodate Standard volumetric Solution. 4 Reagents and materials During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Oxygen (02), 99,5 % (mlm) minimum. 4.2 Ascarite or soda lime, 0,7 to 1,2 mm (14 to 22 mesh). 4.3 Magnesium perchlorate [Mg(ClO&l, 0,7 to 1,2 mm (14 to 22 mesh). 4.4 Glass-wool. 4.5 Crucibles and lids. 4.51 Ceramic crucibles shall be of precise dimensions so that the Sample is positioned correctly in the induction coil of the furnace (sec 9.1). 4.5.2 Pre-ignite the crucibles in air or Oxygen in a furnace for not less than 1 h at 1 100 OC and store in a desiccator or closed Container. A resistance furnace with a combustion tube through which a flow of Oxygen Passes may be used. Crucible lids, used to help retain the solid Oxidation products in the hot Zone, are pre-ignited in a similar manner. 4.6 Fluxes: Low Sulfur tin, topper plus tin, topper or
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