《BS-4258-2-1989.pdf》由会员分享，可在线阅读，更多相关《BS-4258-2-1989.pdf（8页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 4258-2: 1989 Methods of test for Phosphoric acid (orthophosphoric acid) for industrial use Part 2: Determination of iron content Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4258-2:1989 This British Standard, having
2、 been prepared under the direction of the Chemicals Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 29 September 1989 BSI 02-2000 First published January 1968 First revision September 1989 The following BSI references relate to the work on t
3、his standard: Committee reference CIC/37 Draft for comment 88/51187 DC ISBN 0 580 17366 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/37, upon which the followin
4、g bodies were represented: Association of Public Analysts British Coal Corporation Chemical Industries Association Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Institute of Trading Standards Administration Ministry of Agriculture,
5、Fisheries and Food Ministry of Defence Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4258-2:1989 BSI 02-2000i Contents Page Committees responsibleInside front cover Forew
6、ordii 1Scope1 2Principle1 3Reagents1 4Apparatus1 5Procedure1 6Calculation and expression of results1 7Test report1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4258-2:1989 ii BSI 02-2000 Forewo
7、rd This Part of BS 4258 has been prepared under the direction of the Chemicals Standards Policy Committee to provide methods for the analysis of phosphoric acid (orthophosphoric acid) for industrial use. This Part supersedes BS 4285-2:1968, which is withdrawn, and from which it differs by making sub
8、stantial reference to BS 6337-3, possession of which is essential, and by using 1,10-phenanthroline for formation of the coloured complex rather than 2,2-bipyridyl. This Part includes a procedure for the preparation of a test solution suitable for subsequent treatment and determination of iron conte
9、nt in accordance with the general method of BS 6337-3 which reflects current practice in technique and presentation. This Part of BS 4258 is related to ISO/R 849, from which it differs in the same way as from BS 4258-2:1968. A British Standard does not purport to include all the necessary provisions
10、 of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an ins
11、ide back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (
12、c) BSI BS 4258-2:1989 BSI 02-20001 1 Scope This Part of BS 4258 describes a spectrometric method for determination of the iron content of phosphoric acid (orthophosphoric acid) for industrial use. It is applicable to products having an iron content of not lower than 20 mg/kg. NOTE 1A reduced lower l
13、imit for applicability cannot be quoted for this method because of the risk of interference of phosphate in the development of colour (see clause 2 of BS 6337-3:1983). NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle The principle is
14、described in clause 3 of BS 6337-3:1983. 3 Reagents The reagents described in clause 4 of BS 6337-3:1983 and water complying with grade 3 of BS 3978 are required. 4 Apparatus 4.1 General. The apparatus described in clause 5 of BS 6337-3:1983, together with the following, is required. 4.2 One-mark vo
15、lumetric flask, 100 mL, complying with BS 1792, class B. 5 Procedure 5.1 Test portion and preparation of the test solution Weigh, to the nearest 0.0001 g, a test portion of approximately 1 g. Transfer quantitatively to the volumetric flask (4.2) and add 10 mL of the hydrochloric acid (see 4.1 of BS
16、6337-3:1983). Dilute to the mark with water and mix well. NOTEIt is recommended that reference be made to the information on sampling given in BS 4258-12. 5.2 Determination Take an aliquot portion of the test solution not exceeding 50 mL in volume and not containing more than 500 4g of iron (express
17、ed as Fe). Determine the iron content of this aliquot portion by following the procedure described in clause 6 of BS 6337-3:1983. 6 Calculation and expression of results Calculate the mass of iron in the aliquot portion of the test solution in accordance with clause 7 of BS 6337-3:1983. The iron con
18、tent, expressed as milligrams of iron (Fe) per kilogram, is given by the following expression: where 7 Test report The test report shall include the following information: a) a complete identification of the sample; b) a reference to this British Standard, i.e. BS 4258-2:1989; c) the results express
19、ed in accordance with clause 6; d) details of any unusual features noted during the determination; e) any operation not included in this British Standard or regarded as optional. M0is the mass of the test portion (see 5.1) (in g); M1is the mass of iron found in the aliquot portion of the test soluti
20、on (see 5.2) (in 4g); M2is the mass of iron found in the aliquot portion of the blank test solution (see 6.2 of BS 6337-3:1983) (in 4g); Vis the volume of the aliquot portion of the test solution (see 5.2) (in mL). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncon
21、trolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4258-2:1989 BSI 02-2000 Publications referred to BS 1792, Specification for one-mark volumetric flasks. BS 3978, Specification for water for laboratory use. BS
22、4258, Methods of test for phosphoric acid (orthophosphoric acid) for industrial use. BS 4258-12, Guide to sampling techniques. BS 6337, General methods of chemical analysis. BS 6337-3, Method for determination of iron content (1,10-phenanthroline spectrophotometric method). ISO/R 849, Phosphoric aci
23、d for industrial use Determination of iron content 2,2-Bipyridyl spectrophotometric method1). 1) Referred to in the foreword only. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4258-2: 1989 BSI 389 Chiswick High Road London W4 4AL BSI B
24、ritish Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users o
25、f British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary
26、of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying st
27、andards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as Bri
28、tish Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give d
29、etails on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits co
30、ntact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 19
31、88 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details s
32、uch as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI