《BS-3482-4-1991.pdf》由会员分享，可在线阅读，更多相关《BS-3482-4-1991.pdf（8页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 3482-4: 1991 Methods of test for Desiccants Part 4: Determination of water-soluble chlorides content NOTEIt is recommended that this Part be read in conjunction with BS 3482-1 “Sampling, and preparation and storage of test samples” which is issued separately. Licensed Copy: sheff
2、ieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-4:1991 This British Standard, having been prepared under the direction of the Chemicals Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 July
3、 1991 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/2 Draft for comment 90/55564 DC ISBN 0 580 19700 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Com
4、mittee (CIC/-) to Technical Committee CIC/2, upon which the following bodies were represented: Chemical Industries Association Ministry of Defence Royal Society of Chemistry Society of British Aerospace Companies Limited Society of Environmental Engineers Amendments issued since publication Amd. No.
5、DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-4:1991 BSI 10-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Principle1 3Reagents1 4Apparatus1 5Preparation of the test sample1 6Procedure
6、1 7Calculation and expression of results1 8Test report1 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-4:1991 ii BSI 10-1999 Foreword This Part of BS 3482 has been prepared under the direc
7、tion of the Chemicals Standards Policy Committee. This revision of BS 3482 comprises Part 1, which describes procedures for sampling and preparation and storage of test samples and a number of Parts describing methods of test for desiccants. This revision supersedes BS 3482:1962 which is withdrawn.
8、It differs from BS 3482:1962 in that individual methods have been published in separate Parts and have been generally updated. Some additional methods not included in BS 3482:1962 have also been incorporated. This Part of BS 3482 also supersedes the methods given in Appendix D of BS 2540:1960 and Ap
9、pendix D of BS 2541:1960 which are withdrawn. A British Standard does not purport to include all the necessary provisions 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 obligati
10、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside 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
11、 inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-4:1991 BSI 10-19991 1 Scope This Part of BS 3482 describes a method for the determination of the water-soluble chlorides content of desiccants. NOTEThe titles of th
12、e publications referred to in this standard are listed on the inside back cover. 2 Principle Chlorides are extracted from the sample by refluxing with boiling water. The resulting solution is titrated with standard silver nitrate solution. 3 Reagents 3.1 General. Use only reagents of recognized anal
13、ytical grade and water complying with grade 3 of BS 3978. 3.2 Silver nitrate standard volumetric solution, c(AgNO3) = 0.100 mol/L. 3.3 Potassium chromate solution, c(K2CrO3) = 5 % (m/m). 4 Apparatus 4.1 Ordinary laboratory apparatus and the following are required. 4.2 Filter paper, fine grade. 4.3 B
14、urette, of maximum capacity 10 mL, complying with class A of BS 846. 5 Preparation of the test sample Prepare at least 400 mL of aqueous extract by the method described in BS 3482-1. Filter the extract through the filter paper (4.2). 6 Procedure 6.1 Test portion Transfer 200 mL of the test sample to
15、 a 500 mL flask (clause 5). 6.2 Titration Add 5 mL of the potassium chromate solution (3.3) to the flask containing the test portion. Mix well. Titrate with the silver nitrate solution (3.2) using the burette (4.3) until the reddish coloration of silver chromate just forms and persists for at least
16、15 s. Record the volume of silver nitrate solution required (in millilitres). 7 Calculation and expression of results Calculate the water-soluble chlorides content, as a percentage by mass of sodium chloride (NaCl), from the following expression: which reduces to 0.02925 V 8 Test report The test rep
17、ort shall include the following information. a) A complete identification of the sample. b) A reference to this British Standard method, i.e. BS 3482-4:1991. c) The result expressed in accordance with clause 7. d) Any unusual features noted during the determination. where: V is the volume of silver
18、nitrate solution used in the titration (6.2) (in mL). V 1000 - -0.1058.5 500 50200() -100 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Co
19、py, (c) BSI BS 3482-4:1991 BSI 10-1999 Publication(s) referred to BS 846, Specification for burettes. BS 3482, Methods of test for desiccants. BS 3482-1, Sampling, and preparation and storage of samples. BS 3978, Specification for water for laboratory use. Licensed Copy: sheffieldun sheffieldun, na,
20、 Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-4: 1991 BSI 389 Chiswick High Road London W4 4AL BSI British 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 inter
21、national level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of 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. W
22、e would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary 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
23、 updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards 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
24、orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Li
25、brary and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details 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
26、 developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact 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
27、 publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 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 writte
28、n permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such 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, Wed Nov 29 07:32:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI