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1、BRITISH STANDARD BS 3482-1: 1991 Methods of test for Desiccants Part 1: Sampling, and preparation and storage of test samples Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1:1991 This British Standard, having been prepared under th
2、e direction of the Chemicals Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 July 1991 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference CIC/2 Draft for comment 90/55561 DC ISBN 0 580 196
3、87 9 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/2, upon which the following bodies were represented: Chemical Industries Association Ministry of Defence Royal S
4、ociety of Chemistry Society of British Aerospace Companies Limited Society of Environmental Engineers Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1:1991 BSI 07-1999i Conten
5、ts Page Committees responsibleInside front cover Forewordii 1Scope1 2Definition1 3Sampling1 4Method for preparation of the aqueous extract1 5Method for preparation of the dried sample1 6Marking of the containers1 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na,
6、 Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1:1991 ii BSI 07-1999 Foreword This Part of BS 3482 has been prepared under the direction of the Chemicals Standards Policy Committee. This revision of BS 3482 comprises Part 1, which describes procedures for sampling and prepar
7、ation 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 This revision supersedes BS 3482:1962 which is withdrawn. It differs from the BS 3482:1962 in that individual methods have been published in separate Parts and have been generally updated. Some additi
8、onal methods not included in BS 3482:1962 have also been incorporated. 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 imm
9、unity 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 indicated in t
10、he amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1:1991 BSI 07-19991 1 Scope This Part of BS 3482 describes methods for the sampling, and preparation and storage of test samples for analys
11、is by the methods described in BS 3482-2 to BS 3482-11. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definition For the purposes of this British Standard the following definition applies. laboratory sample representative sample taken from one
12、 batch and contained in an airtight container of such a capacity that it is nearly filled by the sample 3 Sampling Sampling shall be carried out in accordance with BS 5309-1 and BS 5309-4. 4 Method for preparation of the aqueous extract 4.1 Principle An aqueous extract is obtained by boiling a porti
13、on of the laboratory sample under reflux for 2 h in water. 4.2 Apparatus 4.2.1 Ordinary laboratory apparatus is required. 4.3 Reagents 4.3.1 Water, complying with grade 3 of BS 3978, freshly boiled and cooled. 4.4 Procedure Weigh 50 0.5 g of a laboratory sample into a 1 L flask and add 500 mL of wat
14、er (4.3.1). Heat under reflux for 2 h using an electric heating mantle to reduce the risk of “bumping”. Allow the flask to cool to room temperature avoiding contamination from atmospheric impurities. Stopper or seal the flask as soon as it is cool and retain for use. 5 Method for preparation of the
15、dried sample 5.1 Principle A portion is placed in an air circulating oven and heated under specified conditions. 5.2 Apparatus 5.2.1 Ordinary laboratory apparatus and the following are required. 5.2.2 Oven, air circulating and ventilated, capable of maintaining the temperature specified in the desic
16、cant product standard within a tolerance of 2.5 C. 5.2.3 Desiccator, containing anhydrous phosphorus pentaoxide. 5.3 Procedure Transfer 75 g of the laboratory sample to a clean dish with cover or a weighing bottle with ground glass lid. Remove the cover or lid and transfer to the oven (5.2.2) at the
17、 temperature and for the time specified in the desiccant product standard. Replace the cover or lid, transfer to the desiccator (5.2.3) and allow to cool before use. 6 Marking of the containers The containers of laboratory sample, aqueous extract (clause 4) and dried sample (clause 5) shall bear lab
18、els or marks stating the following. a) A complete identification of the sample. b) The name of the product. c) The origin of the product, i.e. batch no., bag no., etc. d) The nature of the sample, i.e. laboratory sample, aqueous extract or dried sample. e) The date of preparation. Licensed Copy: she
19、ffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1:1991 BSI 07-1999 Publication(s) referred to BS 3482, Methods of test for desiccants. B
20、S 3482-2, Determination of moisture content. BS 3482-3, Determination of pH. BS 3482-4, Determination of water-soluble chlorides content. BS 3482-5, Determination of water-soluble sulphates content. BS 3482-6, Determination of adsorptive capacity. BS 3482-7, Determination of particle size. BS 3482-8
21、, Estimation of ammonia and ammonium compounds content. BS 3482-9, Determination of cobalt chloride content. BS 3482-10, Determination of bulk density (dry basis). BS 3482-11, Determination of friability and dust content. BS 3978, Specification for water for laboratory use. BS 5309, Methods for samp
22、ling chemical products. BS 5309-1, Introduction and general principles. BS 5309-4, Sampling of solids. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:31:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3482-1: 1991 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution
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