1、BRITISH STANDARD BS 4267-10: 1994 Ammonium nitrate Part 10: Method for determination of matter soluble in diethyl etherBS4267-10:1994 This British Standard, havingbeen prepared under thedirection of the ChemicalsStandards Policy Committee, waspublished underthe authorityof the Standards Boardand com
2、esintoeffect 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 22777 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the C
3、hemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/37, upon which the following bodies were represented: Association of Public Analysts British Aggregate Construction Materials Industries British Coal Corporation Chemical Industries Association Consumers Association Department of
4、 Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Horticultural Trades Association Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food Ministry of Defence Amendments issued since publication Amd. No. Date Commen
5、tsBS4267-10:1994 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative reference 1 3 Principle 1 4 Reagent 1 5 Apparatus 1 6 Procedure 1 7 Calculation and expression of results 1 8 Test report 1 List of references Inside back coverBS4267-10:1994 ii B
6、SI 09-1999 Foreword This Part of BS4267 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 technical suitab
7、ility 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 necessary provisions
8、 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, pages1 and 2, an insi
9、de 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.BS4267-10:1994 BSI 09-1999 1 1 Scope This Part of BS4267 describes a gravimetric method for the determ
10、ination of matter soluble in diethyl ether in ammonium nitrate for industrial use. 2 Normative reference This Part of BS4267 incorporates, by reference, provisions from a specific edition of another publication. This normative reference is cited at the appropriate point in the text and the publicati
11、on is listed on the inside back cover. Subsequent amendments to, or revisions of this publication apply to this Part of BS4267 only when incorporated in it by updating or revision. 3 Principle The test portion is extracted with diethyl ether, volatile fractions are removed from the extract and the r
12、esulting residue is weighed. 4 Reagent 4.1 Diethyl ether, conforming to BS579:1957 and dried before use. 5 Apparatus 5.1 Ordinary laboratory apparatus 5.2 Glass evaporating basin 5.3 Soxhlet extraction apparatus, with a cellulose thimble of a size suitable for extraction of a 25g sample. 5.4 Water b
13、ath 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 evaporating basin (5.2) for 1h in the oven(5.5) maintained at 103 C 2 C. Cool in the desiccator (5.6) and weigh to the nearest 0.00
14、1g. 6.2 Test portion Weigh, to the nearest 0.01g, 25g of the test sample and transfer to the extraction thimble (see5.3). If necessary, break up the sample by crushing rather than grinding. 6.3 Extraction of the sample Assemble the Soxhlet apparatus (5.3) in a fume cupboard and extract the test port
15、ion (6.2) with the diethyl ether (4.1) for at least 1h using the water bath (5.4) as the heat source. Remove the receiver and transfer the solution to the prepared 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
16、 at 103 C 2 C and heat for 1h. Cool in the desiccator (5.6) and weigh to the nearest 0.001g. Repeat the operations of heating, cooling and weighing until the difference in mass between two successive weighings does not exceed 0.002g. 7 Calculation and expression of results The matter soluble in diet
17、hyl 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 shall include the following information: a) a complete identification of the sample; b) a reference to this British Standard i.e. BS4267-1
18、0:1994; 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 of BS4267 or regarded as optional.2 blankBS4267-10:1994 BSI 09-1999 List of references (see clause 2) Normative references BSI publications
19、 BRITISH STANDARDS INSTITUTION, London BS 579:1957, Specification for diethyl ether (technical). BS 4267-10: 1994 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standa
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