1、BRITISH STANDARD BS 4258-9: 1989 Methods of test for Phosphoric acid (orthophosphoric acid) for industrial use Part 9: Determination of chloride contentBS4258-9:1989 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the aut
2、horityof the Board of BSIandcomes into effect on 29September1989 BSI 10-1999 First published January 1978 First revision September 1989 The following BSI references relate to the work on this standard: Committee reference CLC/25 Draft for comment 87/53566 DC ISBN 0 580 17073 X Committees responsible
3、 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 Coal Corporation Chemical Industries Associati
4、on Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food Ministry of Defence Amendments issued since publication Amd. No. Date of issue CommentsBS4258
5、-9:1989 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Reagents 1 4 Apparatus 1 5 Procedure 1 6 Calculation and expression of results 1 7 Test report 1 Publications referred to Inside back coverBS4258-9:1989 ii BSI 10-1999 Foreword This Pa
6、rt of BS4258has been prepared under the direction of the Chemicals Standards Policy Committee to provide methods for the analysis of phosphoric acid (orthophosphoric acid) for industrial use. This Part supersedes BS 4258-9:1978, which is withdrawn, and from which it differs by making substantial ref
7、erence to BS 6337-4, possession of which is essential. This Part includes a procedure for the preparation of a test solution suitable for subsequent treatment and determination of chloride ions in accordance with the general method which reflects current practice in technique and presentation. This
8、Part is closely related to ISO 3708, from which it differs in the same way as from BS 4258-9:1978. 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. Compliance with a British Standard d
9、oes 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 inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.
10、This will be indicated in the amendment table on the inside front cover.BS4258-9:1989 BSI 10-1999 1 1 Scope This Part of BS4258describes a potentiometric method for determination of the chloride content of phosphoric acid (orthophosphoric acid) for industrial use. It is applicable to products having
11、chloride contents of between1mg/kg and1500mg/kg. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle The principle is described in clause3 of BS 6337-4:1984. 3 Reagents The reagents described in clause 4 of BS 6337-4:1984 and water complyi
12、ng with grade3of BS3978are required. 4 Apparatus The apparatus described in clause 5 of BS 6337-4:1984 is required. 5 Procedure 5.1 Test portion and preparation of the test solution Into a low-form beaker of convenient capacity (for example400mL), weigh, to the nearest0.001g, a test portion of appro
13、ximately50g, containing between504g and75000 4g of chlorine. Add20mL of water and swirl to dissolve. NOTE 1It is recommended that reference be made to the information on sampling given in BS 4258-12. NOTE 2It is recommended that the test solution contain at least1504g of chlorine. 5.2 Determination
14、Determine the chloride content of the whole of the test solution by following the procedure described in clause 6 of BS 6337-4:1984, using as titrant silver nitrate solution of the appropriate strength depending on the expected chloride ion content, and adding2mL of the nitric acid (see 6.2.2 and 6.
15、2.3 of BS 6337-4:1984). 6 Calculation and expression of results Calculate the mass of chloride, expressed as chlorine (Cl) (in g) in the test solution from the formula given in clause 7 of BS 6337-4:1984. The chloride content, expressed as milligrams of chlorine (Cl) per kilogram, is given by the fo
16、llowing expression: where 7 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. BS 4258-9:1989; c) the results expressed in accordance with clause6; d) details of any unusual features noted dur
17、ing the determination; e) any operation not included in this British Standard or regarded as optional. m 1 is the mass of chlorine found in the test solution (see 5.2) (in g); m 2 is the mass of the test portion (see 5.1) (in g). m 1 10 6 m 2 -2 blankBS4258-9:1989 BSI 10-1999 Publications referred t
18、o BS 3978, Specification for water for laboratory use. BS 4258, Methods of test for phosphoric acid (orthophosphoric acid) for industrial use. BS 4258-12, Guide to sampling techniques. BS 6337, General methods of chemical analysis. BS 6337-4, Method for determination of chloride ions by potentiometr
19、y. ISO 3708, Phosphoric acid for industrial use (including foodstuffs) Determination of chloride content Potentiometric method 1) . 1) Referred to in the foreword only.BS 4258-9: 1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body respons
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