ISO-9208-1989.pdf
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1、INTERNATIONAL STANDARD IS0 9208 First edition 1989-10-15 Aluminium ores - Determination of vanadium content - BPHA spectrophotometric method Minerais alumineux - Dosage du vanadium - Mkthode spectrophotomktrique au BPHA Reference number IS0 9208 : 1989 (E) Copyright International Organization for St
2、andardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:50:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9208 : 1989 (EI Foreword IS0 (the International Organization for Standardization) is a
3、 worldwide federation 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 represente
4、d on that committee. International organizations, govern- mental 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
5、adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance witfi IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 92
6、08 was prepared by Technical Committee ISO/TC 129, Aluminium ores. Annex A forms an integral part of this International Standard. Annex B is for infor- mation only. 0 IS0 1969 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or me
7、chanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under lic
8、ense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:50:13 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 9288 : 1989 (E) Aluminium ores - Determination of vanadium content - BPHA spectrophotometric method 1
9、Scope This International Standard specifies a BPHA spectrophoto- metric method for the determination of the vanadium content of aluminium ores. It is applicable to ores containing between 0,005 % trnlm) and 0,4 % (m/m) of vanadium pentoxide. 4.1 Sodium peroxide. Use only the dry, free-flowing, off-w
10、hite to pale yellow granules or powder. WARNING - Sodium peroxide must be protected against humidity and must not be used once it has begun to agglomerate. 2 Normative references 4.2 Iron(lll) oxide, powder 1 1 ml) at a later step in the analysis. If a brown precipitate forms, the fusion and boiling
11、 steps should be repeated and the boiling time increased. 2 If the chromium content is known to be more than 0.05 % (m/m), add 1 ml of the sodium sulfite solution (4.4) (to reduce any yellow colour due to chromium) and add solution drop by drop until any yellow colour is discharged. 3 A small amount
12、 of white precipitate may settle out upon standing. This has been found to be innocuous and may be disregarded. 7.5.3 Spectrophotometric determination Pipette 25,00 ml of the test solution into the prepared separ- ating funnel (5.5). Add potassium permanganate solution (4.6) dropwise until the pink
13、colour persists for at least 5 min. Per- form the following steps upon each solution in turn : a) add 10 ml of BPHA solution (4.7); b) immediately add 20 ml of chilled hydrochloric acid (4.9); c) immediately extract vigorously for 30 s. Allow the phases to separate for at least 10 min. Run the lower
14、 phase into a dry 25 ml volumetric flask. Add 10 ml of washed chloroform (4.8) to the separating funnel and extract for a further 30 s. Allow the phases to separate for at least 10 min, then combine the lower phase with the first extract. Dilute to the mark with washed chloroform and mix. Measure wi
15、thin 24 h, in a spectrophotometer (5.61, the absorbance of the test solution against washed chloroform in cells of optical path length 10 mm (5.7) at 530 nm and subtract the value obtained for the blank test solution (7.3). 7.6 Preparation of the calibration graph Pipette 0 ml, 5,OO ml, 10,OO ml, 15
16、,00 ml and 20,OO ml aliquots of the vanadium standard solution (4.11) into 100 ml volumetric flasks. For vanadium contents less than 0,05 % (m/m), use 0 ml, 1,00 ml, 2,00 ml, 5,00 ml and 10.00 ml aliquots. Add 50 ml of matrix solution (4.121, dilute to the mark with water and mix. Take 25.00 ml aliq
17、uots of these solutions through the same procedure as the test aliquot specified in 7.5.3. Plot the absorbance of each calibration solution against the respective mass, in micrograms, of vanadium pentoxide contained in the aliquots. 25 ml aliquots taken from dilutions of 5 ml, 10 ml, 15 ml and 20 ml
18、 aliquots of the vanadium standard solution (4.11) correspond respectively to 100 pg, 200 pg, 300 pg and 400 pg of vanadium pentoxide. NOTE - As a guide to the performance of the method the following information is provided. The calibration solution containing 400 ug of VzOa, when measured at 530 nm
19、 using an optical path length of 10 mm and corrected for the zero calibration blank, gave an absorbance of 0,830. 8 Expression of results 8.1 Calculation of vanadium pentoxide content The vanadium content, expressed as a percentage by mass of vanadium pentoxide in the test sample is given by the for
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