1、BRITISH STANDARD BS 4427-3: 1989 Methods of test for Sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use Part 3: Condensed phosphates for industrial use (including foodstuffs): determination of iron contentBS4427-3:1989 This Brit
2、ish Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Board ofBSIandcomes into effect on 29September1989 BSI 11-1999 First published February 1969 First revision September 1989 The following BSI references relate to
3、the work on this standard: Committee reference CIC/34 Draft for comment88/51191DC ISBN 0 580 17367 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/34, upon which t
4、he following bodies were represented: Chemical Industries Association Consumer Standards Policy Committee of BSI Department of the Environment Department of Trade and Industry (Laboratory of the Government Chemist) Ministry of Defence Royal Society of Chemistry Soap and Detergent Industry Associatio
5、n Society of Dyers and Colourists Amendments issued since publication Amd. No. Date of issue CommentsBS4427-3:1989 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 result
6、s 1 7 Test report 1 Publications referred to Inside back coverBS4427-3:1989 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 foodstuf
7、fs). This Part supersedes BS4427-3:1969 (identical with ISO/R852) which is withdrawn and from which it differs by making substantial reference to BS6337-3, possession of which is essential, and by using1,10phenanthroline for formation of the coloured complex rather than 2,2 bipyridyl. This Part of B
8、S4427 includes a procedure for the preparation of a test solution suitable for subsequent treatment of condensed phosphates and determination of iron content in accordance with the general method of BS6337-3 which reflects current practice in technique and presentation. This Part of BS4427 is relate
9、d to ISO/R852, from which it differs for the same reasons. 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 does not of itself confer immunity from l
10、egal obligations. 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 tab
11、le on the inside front cover.BS4427-3:1989 BSI 11-1999 1 1 Scope This Part of BS4427 describes a spectrometric method for determination of the iron content of condensed phosphates for industrial use (including foodstuffs). It is applicable to products having an iron content of not lower than2mg/kg.
12、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 BS6337-3:1983. 3 Reagents The reagents described in clause4 of BS6337-3:1983 and water complying with grade3 of BS3978 are required. 4 Apparatus T
13、he apparatus described in clause5 of BS6337-3:1983 is required. 5 Procedure 5.1 Test portion and preparation of the test solution Into a low-form100mL beaker, weigh, to the nearest0.0001g, a test portion of approximately5g. Add50mL of the hydrochloric acid (see4.1 of BS6337-3:1983), cover the beaker
14、 with a watch glass and boil gently for30min. Coolto room temperature. 5.2 Determination Determine the iron content of the test solution by following the procedure described in clause6 of BS6337-3:1983, ensuring that all of the test solution (5.1) is used. 6 Calculation and expression of results Cal
15、culate the mass of iron (Fe) in the test solution in accordance with clause7 of BS6337-3:1983. The iron content, expressed as milligrams of iron per kilogram, is given by the following expression: where 7 Test report The test report shall include the following information: a) a complete identificati
16、on of the sample; b) a reference to this British Standard, i.e.BS4427-3:1989; 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 British Standard or regarded as optional. M 0 is the mass of the
17、 test portion (5.1) (ing); M 1 is the mass of iron found in the test solution (see5.2) (in 4g); M 2 is the mass of iron found in the blank test solution (see6.2 of BS6337-3:1983) (in4g). M 1 M 2 M 0 -2 blankBS4427-3:1989 BSI 11-1999 Publications referred to BS 3978, Specification for water for labor
18、atory use. BS 6337, General methods of chemical analysis. BS 6337-3, Method for determination of iron content (1,10-phenanthroline spectrophotometric method). ISO/R 852, Sodium tripolyphosphate and sodium pyrophosphate for industrial useDetermination of iron content2,2 Bipyridyl spectrophotometric m
19、ethod 1) . 1) Referred to in the foreword only.BS 4427-3: 1989 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 standards in Europe and at the international level. It is
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