1、BRITISH STANDARD BS 4651-3: 1987 ISO 7109:1985 Ammonia solution Part 3: Method for determination of residue on evaporation ISO title: Ammonia solution for industrial use Determination of residue after evaporation at105 C Gravimetric method UDC 546.171.1-145.2:543.714BS4651-3:1987 This British Standa
2、rd, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 27February1987 BSI 12-1999 The following BSI references relate to the work on this standard: Committee references CIC/21 Draft for comment 84/
3、50531 DC ISBN 0 580 15883 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC/21, upon which the following bodies were represented: British Coal British Pharmacopoeia Commiss
4、ion British Sulphate of Ammonia Federation Ltd. Chemical Industries Association Fertiliser Manufacturers Association Ltd. Ministry of Defence Textile Institute Amendments issued since publication Amd. No. Date of issue CommentsBS4651-3:1987 BSI 12-1999 i Contents Page Committees responsible Inside f
5、ront cover National foreword ii 1 Scope and field of application 1 2 Reference 1 3 Principle 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 1 7 Test report 1 Publication referred to Inside back coverBS4651-3:1987 ii BSI 12-1999 National foreword This Part of BS4651 has been prepared under the
6、 direction of the Chemicals Standards Committee. It is identical with ISO7109:1985 “Ammonia solution for industrial use Determination of residue after evaporation at105 C Gravimetric method”, published by the International Organization for Standardization (ISO). This method supersedes part of clause
7、4 of BS4651:1971, which has been revised by amendment. It is intended to publish eight Parts of BS4651 which collectively will supersede the1971 edition. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without de
8、viation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker
9、. The symbol “ml” has been used to denote millilitre. In British Standards it is current practice to use the symbol “mL”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Part of BS4651”. This standard prescribes a method of test only and should
10、 not be used orquoted as a specification defining limits of purity. Reference to this Part should indicate that the method of test used complies with BS4651-3:1987. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible f
11、or their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International Standard Corresponding British Standard ISO 758:1976 BS 4522:1970 Method for the determination of density of liquids at20 C (Technically equivalen
12、t) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, 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 insid
13、e front cover.BS4651-3:1987 BSI 12-1999 1 WARNING Carry out all the operations in a well-ventilated fume cupboard. 1 Scope and field of application This International Standard specifies a gravimetric method for the determination of the residue after evaporation of ammonia solution for industrial use
14、. The method is applicable to solutions containing not more than35% (m/m) of ammonia. 2 Reference ISO 758, Liquid chemical products for industrial use Determination of density at20 C. 3 Principle Evaporation of a test portion in a tared platinum dish; weighing of the residue after drying at105 2 C.
15、4 Apparatus Ordinary laboratory apparatus and 4.1 Platinum dish, diameter about75mm. 4.2 Electric oven, capable of being maintained at105 2 C. 5 Procedure 5.1 Test portion Fill a500ml one-mark volumetric flask to the mark with some of the laboratory sample. 5.2 Determination Weigh, to the nearest0,0
16、001g, the platinum dish(4.1) previously dried at105 2 C and cooled in a desiccator. Pour some of the test portion (5.1) into the weighed platinum dish, and place on a bath of boiling water in a well-ventilated fume cupboard. Carefully evaporate the solution, gradually adding more of the test portion
17、, until the test portion has evaporated to a volume of about40ml. Wash the volumetric flask with two 10ml portions of distilled water and add the washings to the dish. Continue the operation until all liquid has completely evaporated. Remove the dish from the water bath and place it in the electric
18、oven (4.2) maintained at105 2 C, for at least30min. Allow the dish containing the residue to cool in a desiccator and weigh to the nearest0,0001g. 6 Expression of results The residue after evaporation, expressed in milligrams per kilogram, is given by the formula where m 0 is the mass, in grams, of
19、the empty platinum dish; m 1 is the mass, in grams, of the platinum dish and residue; V is the volume, in millilitres, of the test portion (5.1); is the density, in grams per millilitre, of the test sample, determined in accordance with the method specified in ISO758. 7 Test report The test report s
20、hall include the following particulars: a) an identification of the sample; b) the reference of the method used; c) the results and the method of expression used; d) any unusual features noted during the determination; e) any operation not included in this International Standard or in the Internatio
21、nal Standard to which reference is made, or regarded as optional. m 1 m 0 V -10 6 2 blankBS4651-3:1987 BSI 12-1999 Publication referred to See national foreword.BS 4651-3: 1987 ISO7109:1985 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body r
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