BS 4427-1-1969 Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use - Determination of mat.pdf

1、BRITISH STANDARD BS 4427-1: 1969 Methods of test for Sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) Part 1: Determination of matter insoluble in water in sodium tripolyphosphateBS4427-1:1969 This British Standard, having been approved by the C

2、hemicalsIndustry Standards Committee, was published underthe authority of the Executive Board on 28 February 1969 BSI 11-1999 The following BSI reference relates to the work on this standard: Committee reference CIC/25 ISBN 580 05376 8 Co-operating organizations The Chemicals Industry Standards Comm

3、ittee, under whose authority this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Board of Trade British Steel Industry Chemical Industries Association* Department of Health & Social Security Fertiliser

4、 Manufacturers Association Ltd.* Gas Council Institution of Gas Engineers Ministry of Technology. Laboratory of the Government Chemist* National Sulphuric Acid Association Royal Institute of Public Health & Hygiene The industrial organizations marked with an asterisk in the above list, together with

5、 the following, were directly represented on the committee entrusted with the formulation of the United Kingdom point of view in the international work leading to the publication of this British Standard: British Pharmacopoeia Commission Flour Milling and Baking Research Association Institute of Met

6、al Finishing National Association of Soft Drink Manufacturers Society for Water Treatment and Examination Textile Institute Amendments issued since publication Amd. No. Date CommentsBS4427-1:1969 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Princi

7、ple 1 3 Reagents 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 1 7 Test report 1BS4427-1:1969 ii BSI 10-1999 Foreword This standard makes reference to the following British Standard: BS 3978, Water for laboratory use. For some years the United Kingdom has participated in the work of preparin

8、g methods of test for sodium tripolyphosphate and sodium pyrophosphate for industrial use, carried out within Working Group7of Technical Committee47 Chemistry, of the International Organization for Standardization (ISO). As international agreement is reached on the methods, it is proposed to publish

9、 them as parts of this British Standard. This part is technically identical with ISO Recommendation R850, “Sodium tripolyphosphate for industrial use. Determination of matter insoluble in water”. A British Standard does not purport to include all the necessary provisions of a contract. Users of Brit

10、ish 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 i and ii, pages1 and 2, an inside back cover and a back cove

11、r. 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.BS4427-1:1969 BSI 10-1999 1 1 Scope This Part of BS 4427 describes a method for the determination of the matter which is insoluble

12、in water in sodium tripolyphosphate for industrial use. 2 Principle The principle of this method of test is dissolution of the test sample, and separation of any insoluble matter by filtration, drying and weighing. 3 Reagents Distilled water or water of at least equal purity 1)should be used in the

13、test. 4 Apparatus Ordinary laboratory apparatus with the following shall be used: 4.1 Filter crucible, with sintered glass disk, of porosity between15m and40m 4.2 Electric oven, with natural convection, regulated at110 5 C. 5 Procedure 5.1 Test portion. Weigh, to the nearest 0.1g, approximately10g o

14、f the test sample. 5.2 Determination. Place the test portion (5.1) in a beaker of suitable capacity (400ml for example) and dissolve in approximately200ml of water. Boil the solution for about10min, cool and immediately filter under vacuum in the sintered glass crucible (4.1) previously dried at110

15、5 C for2h, cooled in a desiccator and weighed. Wash the precipitate until the filtrate is phosphate-free (qualitative test). Place the crucible in the electric oven (4.2) at a temperature of110 5 C and keep it at this temperature for2h. Then remove the crucible from the oven, allow it to cool in the

16、 desiccator and weigh. The cooling time in the desiccator should be equal to that adopted for taring the empty crucible. 6 Expression of results The matter insoluble in water is given as a percentage by mass by the following formula: 7 Test report State the following in the report: 1) the reference

17、of the method used, 2) the results and the method of expression used, 3) any unusual features noted during the determination, 4) any operation not included in this standard or regarded as optional. 1) Attention is drawn to BS3978, “Water for laboratory use”. where I is the mass, in grammes, of the f

18、iltered and dried insoluble matter, E is the mass, in grammes, of the test portion. I 100 E -2 blankBS4427-1:1969 BSI 10-1999 British Standards The following are available on application: YEARBOOK Including subject index and numerical list of British Standards15s. SECTIONAL LISTS. Gratis Acoustics (

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