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1、BRITISH STANDARD BS 4267-10: 1994 Ammonium nitrate Part 10: Method for determination of matter soluble in diethyl ether Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4267-10:1994 This British Standard, having been prepared under the dir
2、ection of the Chemicals Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 February 1994 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference CIC/37 Draft for comment 93/504557 DC ISBN 0 580 22
3、777 4 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 following bodies were represented: Association of Public Analysts British Aggregate Construc
4、tion Materials Industries British Coal Corporation Chemical Industries Association Consumers Association Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Horticultural Trades Association Institute of Trading Standards Administration Mi
5、nistry of Agriculture, Fisheries and Food Ministry of Defence Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4267-10:1994 BSI 09-1999i Contents Page Committees responsibleInside fr
6、ont cover Forewordii 1Scope1 2Normative reference1 3Principle1 4Reagent1 5Apparatus1 6Procedure1 7Calculation and expression of results1 8Test report1 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 426
7、7-10:1994 ii BSI 09-1999 Foreword This Part of BS 4267 has been prepared under the direction of the Chemicals Standards Policy Committee. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to t
8、echnical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. WARNING. Ammonium nitrate is an oxidizing agent. If necessary, break up the test sample by crushing rather than grinding. A British Standard does not purport to include all the neces
9、sary 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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages
10、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 inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncon
11、trolled Copy, (c) BSI BS 4267-10:1994 BSI 09-19991 1 Scope This Part of BS 4267 describes a gravimetric method for the determination of matter soluble in diethyl ether in ammonium nitrate for industrial use. 2 Normative reference This Part of BS 4267 incorporates, by reference, provisions from a spe
12、cific edition of another publication. This normative reference is cited at the appropriate point in the text and the publication is listed on the inside back cover. Subsequent amendments to, or revisions of this publication apply to this Part of BS 4267 only when incorporated in it by updating or re
13、vision. 3 Principle The test portion is extracted with diethyl ether, volatile fractions are removed from the extract and the resulting residue is weighed. 4 Reagent 4.1 Diethyl ether, conforming to BS 579:1957 and dried before use. 5 Apparatus 5.1 Ordinary laboratory apparatus 5.2 Glass evaporating
14、 basin 5.3 Soxhlet extraction apparatus, with a cellulose thimble of a size suitable for extraction of a 25 g sample. 5.4 Water bath 5.5 Oven, capable of being maintained at 103 C 2 C. 5.6 Desiccator, containing an efficient desiccant. 6 Procedure 6.1 Preparation of the evaporating basin Heat the ev
15、aporating basin (5.2) for 1 h in the oven (5.5) maintained at 103 C 2 C. Cool in the desiccator (5.6) and weigh to the nearest 0.001 g. 6.2 Test portion Weigh, to the nearest 0.01 g, 25 g of the test sample and transfer to the extraction thimble (see 5.3). If necessary, break up the sample by crushi
16、ng rather than grinding. 6.3 Extraction of the sample Assemble the Soxhlet apparatus (5.3) in a fume cupboard and extract the test portion (6.2) with the diethyl ether (4.1) for at least 1 h using the water bath (5.4) as the heat source. Remove the receiver and transfer the solution to the prepared
17、evaporating basin (6.1). Evaporate the diethyl ether to dryness on the water bath (5.4). Transfer the basin to the oven (5.5) maintained at 103 C 2 C and heat for 1 h. Cool in the desiccator (5.6) and weigh to the nearest 0.001 g. Repeat the operations of heating, cooling and weighing until the diff
18、erence in mass between two successive weighings does not exceed 0.002 g. 7 Calculation and expression of results The matter soluble in diethyl ether, expressed as a percentage by mass, is given by the expression: M 4 where M is the mass of the oven dried residue (in g). 8 Test report The test report
19、 shall include the following information: a) a complete identification of the sample; b) a reference to this British Standard i.e. BS 4267-10:1994; c) the results expressed in accordance with clause 7; d) any unusual features noted during the determination; e) any operation not included in this Part
20、 of BS 4267 or regarded as optional. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4267-10:1994 BSI 09-1999 List of refer
21、ences (see clause 2) Normative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 579:1957, Specification for diethyl ether (technical). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:29:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4267-10: 1994 BSI 389 Chiswick High
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