BS-3482-5-1991.pdf
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1、BRITISH STANDARD BS 3482-5: 1991 Methods of test for Desiccants Part 5: Determination of water-soluble sulphates 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 07:32:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-5:1991 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 90/55565 DC ISBN 0 580 19701 8 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 07:32:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-5:1991 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 07:32:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-5:1991 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 This revision supersedes BS 3482:1962 which is withdrawn.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 E of BS 2540:1960 and Ap
9、pendix E of BS 2541:1960 and Appendix D of BS 3523:1962 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 conf
10、er 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 inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicate
11、d in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-5:1991 BSI 10-19991 1 Scope This Part of BS 3482 describes a method for the determination of the water-soluble sulphates content of d
12、esiccants. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle Barium sulphate is precipitated and filtered from a test portion of filtered aqueous extract. The residue is heated in an oven until dry. 3 Reagents 3.1 General. Use only reage
13、nts of recognized analytical grade and water complying with grade 3 of BS 3978. 3.2 Hydrochloric acid solution, 1 180 g/L. 3.3 Barium chloride solution, c(BaCl2) = 10 % (m/m). 3.4 Silver nitrate solution, c(AgNO3) = 1 % (m/m). 4 Apparatus 4.1 Ordinary laboratory apparatus and the following are requi
14、red. 4.2 Filter paper, fine grade, hardened, ashless. 4.3 Oven, capable of being maintained at 110 5 C. 4.4 Muffle furnace, capable of being maintained at 600 10 C. 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 th
15、rough the filter paper (4.2). 6 Procedure 6.1 Test portion Transfer 50 mL of the test sample to a 250 mL glass beaker. 6.2 Precipitation Add 2 mL of the hydrochloric acid solution (3.2) to the test portion (6.1), bring to the boil and slowly add 5 mL of the barium chloride solution (3.3). Place the
16、beaker and solution on a boiling water bath for 2 h, then remove and allow to stand for 16 h. 6.3 Determination Thoroughly mix the precipitate and solution obtained in 6.2, filter through the filter paper (4.1) and wash with 25 mL of water at 70 C. Add to the washings 5 mL of the silver nitrate solu
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