1、BRITISH STANDARD BS 4267-11: 1994 Ammonium nitrate Part 11: Method for determination of inorganic matter and grit insoluble in waterBS4267-11:1994 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Standa
2、rds Boardand comes intoeffecton 15February1994 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference CIC/37 Draft for comment 93/504558 DC ISBN 0 580 22781 2 Committees responsible for this British Standard The preparation of this British Standard was entr
3、usted by the Chemicals Standards Policy Committee (CIC/-) to Technical CommitteeCIC/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
4、Department of 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
5、. Date CommentsBS4267-11:1994 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 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 coverBS426
6、7-11:1994 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
7、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
8、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, pages1
9、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.BS4267-11:1994 BSI 09-1999 1 1 Scope This Part of BS 4267 describes a gravimetric method
10、 for determination of inorganic water-insoluble matter and grit in ammonium nitrate for industrial use. 2 Normative references This Part of BS4267 incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in th
11、e text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS4267 only when incorporated in it by updating or revision. 3 Principle A test portion is dissolved in water, filtered, dried and ashed at dull
12、 red heat. The resulting residue is weighed and the number of particles of grit retained on a425m sieve counted. 4 Reagent 4.1 Water, conforming to grade3 of BS3978:1987. 5 Apparatus 5.1 Ordinary laboratory apparatus 5.2 Test sieve, of nominal aperture425m, conforming to BS410:1986. 5.3 Ashless filt
13、er paper NOTEWhatman No.42 has been found to be suitable. 5.4 Porcelain crucible, of capacity approximately30ml. 5.5 Oven, capable of being maintained at103 C 2 C. 5.6 Furnace, capable of being maintained at700 C 25 C. 5.7 Desiccator, containing an efficient desiccant. 5.8 Camel hair brush 6 Procedu
14、re 6.1 Preparation of the crucible Heat the crucible (5.4) for1h in the furnace (5.6) at700 C 25 C. Cool in the desiccator (5.7). After cooling, weigh to the nearest0.001g. 6.2 Test portion Weigh, to the nearest0.1g, approximately50g of the test sample. 6.3 Determination Place the test portion (6.2)
15、 into a600ml beaker and dissolve it in approximately200ml of hot water. Stir for2min to3min, allow any undissolved solids to settle, and decant the solution carefully through the filter paper (5.3). Repeat the operations of stirring, allowing to settle and decantation using a further200ml of hot wat
16、er. Transfer quantitatively the undissolved solids to the filter paper, wash with water and transfer the filter paper and its contents to the prepared crucible(6.1). Heat the crucible and its contents in the oven(5.5) at103 C 2 C until the moisture is expelled. Transfer the crucible and its contents
17、 to the furnace and heat at700 C 25 C for30min. Remove the crucible, cool in the desiccator (5.7) and weigh to the nearest0.001g. Transfer the residue to the test sieve (5.2) using the brush (5.8) and brush lightly. Examine the residue and count any particles of grit retained on the sieve. 7 Calcula
18、tion and expression of results The inorganic water-insoluble matter, expressed as a percentage by mass, is given by the formula: where Report the number of particles of grit, if any, retained on the test sieve. 8 Test report The test report shall include the following information: a) a complete iden
19、tification of the sample; b) a reference to this British Standard i.e.BS4267-11:1994; c) the results expressed in accordance with clause7; d) any unusual features noted during the determination; e) any operation not included in this Part ofBS4267 or regarded as optional. M 0 is the mass of the test
20、portion (in g); M 1 is the mass of the final residue (in g). M 1 100 M 0 -2 blankBS4267-11:1994 BSI 09-1999 List of references (seeclause 2) Normative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 410:1986, Specification for test sieves. BS 3978:1987, Specification for water f
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