1、BRITISH STANDARD BS 4651-5: 1988 Ammonia solution Part 5: Method for determination of iron content NOTEIt is recommended that this Part be read in conjunction with the information on methods for sampling in BS4651-0, published separately. UDC 546.171.1145.2:543.73:546.72:543.42.062BS4651-5:1988 This
2、 British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31August1988 BSI 12-1999 First published February1971 First part revision as Part5 The committees responsible for this British
3、 Standard are shown inPart0. The following BSI references relate to the work on this standard: Committee reference CIC/21 Draft for comment87/51190 DC ISBN 0 580 16530 2 Foreword This Part of BS4651 has been prepared under the direction of the Chemicals Standards Committee and supersedes clause5 of
4、BS4651:1971 which is withdrawn. This method refers largely to BS6337-3:1983, possession of which is essential. NOTEThe term “ammonia solution” is used to describe grades of product containing25.0% to35.0% (m/m) ammonia. WARNING. Ammonia solution is a moderately strong alkali which exerts a local irr
5、itant action on the skin. Strong solutions which come into contact with the eyes, even for a short period, can cause serious and permanent damage. Ingestion of ammonia solution will result in the destruction of the mucous lining of the mouth, throat and stomach. Ammonia vapour is readily released fr
6、om ammonia solution and is combustible in air between the concentrations of16% and27% (V/V) and may explode in confined spaces. When sampling ammonia solution, take the precautions described in BS4651-0. This Part of BS4651 describes a method of test only and should not be used or quoted as a specif
7、ication defining limits of purity. Reference to this Part should indicate that the method of test used complies with BS4651-5:1988. 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. Com
8、pliance 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 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
9、have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS4651-5:1988 BSI 12-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 Principal 1 3 Reagent 1 4 Apparatus 1 5 Proc
10、edure 1 6 Calculation and expression of results 1 7 Test report 1 Publications referred to Inside back coverii blankBS4651-5:1988 BSI 12-1999 1 1 Scope This Part of BS4651 describes a spectrometric method for determination of the iron content of ammonia solution for industrial use. The method is app
11、licable to products having iron contents between0.2mg/kg and10.0mg/kg. NOTEThe publications referred to in this standard are listed on the inside back cover. 2 Principle The principle is described in clause3 of BS6337-3:1983. 3 Reagents The reagents described in clause4 of BS6337-3:1983 are required
12、. Use water complying with grade3 of BS3978. 4 Apparatus 4.1 General. The apparatus described in clause5 of BS6337-3:1983 and the following are required. 4.2 Platinum dish, approximately75mL capacity. 4.3 One-mark volumetric flask, 50mL, complying with BS1792. 5 Procedure 5.1 Test portion Fill the d
13、ry, one-mark volumetric flask(4.3) to the mark with the test sample. 5.2 Preparation of test solution Transfer some of the test portion(5.1) into the platinum dish(4.2) and place it on a boiling water bath in a well-ventilated fume cupboard. Carefully evaporate the solution, adding more of the test
14、portion until the whole of the50mL has been used. Rinse the volumetric flask with water and add the rinsings to the platinum dish. Continue the evaporation to dryness. Remove the platinum dish from the water bath as soon as it is dry and allow to cool. Add5mL of the hydrochloric acid (see4.1 of BS63
15、37-3:1983) and warm to dissolve the residue. Transfer quantitatively the solution to a beaker and dilute to approximately50mL with water. 5.3 Determination Determine the iron content of the test solution by following the procedure described in clause6 of BS6337-3:1983. 6 Calculation and expression o
16、f results Calculate the mass, in 4g, of iron in the test solution in accordance with clause7 of BS6337-3:1983. The iron content, inmg/kg, of the ammonia solution is given by the following expression. where 7 Test report The test report shall include the following information: a) a reference to this
17、British Standard, i.e.BS4651-5:1988; b) a complete identification of the sample; c) details of any unusual features noted during the determination; d) the results expressed in accordance with clause6; e) any operation not included in this British Standard or regarded as optional. m 0 is the mass of
18、iron found in the blank test (see6.2 of BS6337-3:1983) (in 4g); m 1 is the mass of iron found in the test solution (in 4g); 50 is the volume of the test portion(5.1) (inmL); is the density of the sample at20 C, determined in accordance with BS4651-1 (in g/mL). m 1 m 0 () 50 -2 blankBS4651-5:1988 BSI
19、 12-1999 Publications referred to BS 1792, Specification for one-mark volumetric flasks. BS 3978, Specification for water for laboratory use. BS 4651, Ammonia solution. BS 4651-0, Methods for sampling. BS 4651-1, Method for determination of density at20 C. BS 6337, General methods of chemical analys
20、is. BS 6337-3, Method for determination of iron content (1,10-phenanthroline spectrophotometric method). BS 4651-5: 1988 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
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