BS 4427-14-1989 Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use - Condensed phosphate.pdf

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1、BRITISH STANDARD BS 4427-14: 1989 Methods of test for Sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use Part 14: Condensed phosphates for industrial use (including foodstuffs): Determination of chloride content UDC 661.833+546.

2、33:546.131:633.9:620.1BS4427-14:1989 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 30June1989 BSI 11-1999 First published November 1982 First revision June 1989 T

3、he following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for comment87/53567DC ISBN 0 580 17052 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Te

4、chnical Committee CIC/25, upon which the following bodies were represented: British Soft Drinks Association Ltd. Campden Food Preservation Research Association Chemical Industries Association Fertiliser Manufacturers Association Ltd. Flour Milling and Baking Research Association Society of Chemical

5、Industry Amendments issued since publication Amd. No. Date of issue CommentsBS4427-14:1989 BSI 11-1999 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 Publ

6、ications referred to Inside back coverBS4427-14:1989 ii BSI 11-1999 Foreword This Part of BS4427 has been prepared under the direction of the Chemicals Standards Policy Committee to provide methods for the analysis of condensed phosphates for industrial use (including foodstuffs). This Part supersed

7、es BS4427-14:1982 (identical with ISO5374) which is withdrawn and from which it differs by making substantial reference to BS6337-4:1984, possession of which is essential. This Part of BS4427 includes a procedure for the preparation of a test solution suitable for subsequent treatment of condensed p

8、hosphates and determination of chloride content in accordance with the general method of BS6337-4 which reflects current practice in technique and presentation. This Part of BS4427 is closely related to ISO5374, from which it differs for the reasons given. A British Standard does not purport to incl

9、ude all the necessary 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

10、i 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 inside front cover.BS4427-14:1989 BSI 11-1999 1 1 Scope This Part of BS4427 describes a pote

11、ntiometric method for determination of the chloride content of condensed phosphates for industrial use. It is applicable to products having chloride contents of not less than5mg/kg. 2 Principle The principle is described in clause3 of BS6337-4:1984. 3 Reagents The reagents described in clause4 of BS

12、6337-4:1984 and water complying with grade3 of BS3978 are required. 4 Apparatus 4.1 General. The apparatus described in clause5 of BS6337-4:1984 together with the following are required. 4.2 One-mark volumetric flask. 100mL, complying with classB of BS1792. 5 Procedure 5.1 Test portion and preparati

13、on of the test solution Into a low-form beaker of convenient capacity (for example400mL), weigh, to the nearest0.001g, a test portion of approximately10g, containing at least504g of chlorine and preferably more than1504g of chlorine. Add about75mL of water to the test portion and swirl. Once dissolv

14、ed, transfer quantitatively the solution to the one-mark volumetric flask (4.2). Dilute to the mark with water and mix. 5.2 Determination Determine the chloride content of the test solution by following the procedure described in clause6 of BS6337-4:1984, using an appropriate aliquot portion of the

15、test solution depending on the expected chloride ion content, and ensuring that the test solution is acidified by the addition of2mL of the nitric acid (see6.2.2 of BS6337-4:1984). 6 Calculation and expression of results Calculate the mass of chloride, expressed as chlorine, (Cl), in g, in the test

16、solution from the formula given in clause7 of BS6337-4:1984. The chloride content, expressed as chlorine (Cl), inmg/kg, is given by the following expression: where 7 Test report The test report shall include the following information: a) a complete identification of the sample; b) a reference to thi

17、s British Standard, i.e.BS4427-14:1989; c) the results expressed in accordance with clause6; d) details of any unusual features noted during the determination; e) any operation not included in this BritishStandard or regarded as optional. m 1 is the mass of chlorine found in the test solution (see5.

18、2) (ing); m 2 is the mass of the test portion (see5.1) (ing). m 110 6 m 2 -2 blankBS4427-14:1989 BSI 11-1999 Publications referred to BS 1792, Specification for one-mark volumetric flasks. BS 3978, Specification for water for laboratory use. BS 6337, General methods of chemical analysis. BS 6337-4,

19、Method for determination of chloride ions by potentiometry. ISO 5374, Condensed phosphates for industrial use (including foodstuffs)Determination of chloride contentPotentiometric method 1) . 1) Referred to in the foreword only.BS 4427-14: 1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStan

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