ISO-4283-1993.pdf
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1、INTERNATIONAL STANDARD IS0 4283 Third edition 1993-01-15 All grades of fluorspar - Determination of carbonate content - Titrimetric method Tous /es spaths fluor - Dosage des carbonates - MBthode titrimbtrique Reference number IS0 4283:1993(E) Copyright International Organization for Standardization
2、Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 03:00:59 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4283:1993(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federa
3、tion of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committ
4、ee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the tech
5、nical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 4283 was prepared by Technical Committee lSO/TC 175, Nuorspar. This third edition cancels and r
6、eplaces the second edition (IS0 4283:1990), which has been updated. Annex A of this International Standard is for information only. Q IS0 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
7、and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 * Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA
8、Technical Standards 1/9972545001 Not for Resale, 04/26/2007 03:00:59 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 4283:1993(E) All grades of fluorspar - Determination of carbonate content - Titrimetric method 1 Scope This International Standard
9、 specifies a titrimetric method for the determination of the carbonate con- tent of all grades of fluorspar. The method is applicable to products having carbonate contents, expressed as calcium carbonate (CaCO,), equal to or greater than 0,04 % (m/m). 2 Normative references The following standards c
10、ontain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to inve
11、stigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 565:1990, Test sieves - Metal wire cloth, per- forated metal plate and electroformed sheet - Nom- inal sizes of
12、 openings. IS0 4793:1980, Laboratory sintered (fritted) filters - Porosity grading, classification and designation. IS0 8868:1989, Fluorspar - Sampling and sample preparation. 3 Principle Treatment of a test portion with hydrochloric acid solution, absorption of the evolved carbon dioxide in barium
13、hydroxide solution, neutralization of excess alkali with hydrochloric acid solution, addition of an exactly measured excess of a standard volumetric hydrochloric acid solution to dissolve the precipitated barium carbonate and back-titration with a standard volumetric sodium hydroxide solution using
14、methyl orange or screened methyl orange as indicator. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity, free from carbon dioxide. 4.1 Butan-l-01. 4.2 Nitrogen, free from carbon dioxide. 4.3 Boric acid. 4.4 Barium
15、chloride dihydrate (BaCl,.2H,O), 122 g/l solution. 4.5 Hydrochloric acid, p approximately I,12 g/ml, about 25 % (m/m) solution. Dilute 3 volumes of concentrated hydrochloric acid (p approximately I,19 g/ml) with 2 volumes of water. 4.6 Pumice, impregnated with copper sulfate. Mix grains of pumice wi
16、th a saturated copper sul- fate solution. Allow to stand for 1 h and filter off the pumice grains. Dry the impregnated grains in an oven (5.3) at 150 -C to 180 “C. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/99
17、72545001 Not for Resale, 04/26/2007 03:00:59 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4283:1993(E) 4.7 Potassium hydroxide, about 20 % (m/m) ution. 4.8 Hydrochloric acid, approximately 365 g/l ution. 4.9 Sodium hydroxide, ution. 4.10 Hydrochloric acid, ution, c(H
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