BS 4427-4-1969 Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use - Determination of los.pdf

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1、BRITISH STANDARD BS 4427-4: 1969 Methods of test for Sodium tripolyphosphate (penta sodium triphosphate) and sodium pyrophosphate (tetra sodium pyrophosphate) Part 4: Determination of loss on ignitionBS4427-4:1969 This British Standard, having been approved by the Chemicals Industry Standards Commit

2、tee, was published under the authorityof the Executive Boardon 28 February1969 BSI 11-1999 The following BSI reference relates to the work on this standard: Committee reference CIC/25 ISBN 580 05436 5 Co-operating organizations The Chemicals Industry Standards Committee, under whose authority this B

3、ritish 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 Manufacturers Association Ltd.* Ga

4、s 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 the following, were directly repre

5、sented on the committee entrusted with the formulation of the UnitedKingdom 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 Metal Finishing National Association of

6、 Soft Drink Manufacturers Society for Water Treatment and Examination Textile Institute Amendments issued since publication Amd. No. Date CommentsBS4427-4:1969 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Procedure 1 5

7、Expression of results 1 6 Test report 1BS4427-4:1969 ii BSI 11-1999 Foreword For some years the United Kingdom has participated in the work of preparing methods of test for sodium tripolyphosphate and sodium pyrophosphate for industrial use, carried out within Working Group7 of Technical Committee47

8、 Chemistry, of the InternationalOrganization for Standardization (ISO). As international agreement is reached on the methods, it is proposed to publish them as parts of this BritishStandard. This part is technically identical with ISO Recommendation R853, “Sodium tripolyphosphate and sodium pyrophos

9、phate for industrial use. Determination of loss on ignition”. 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 fro

10、m legal 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

11、table on the inside front cover.BS4427-4:1969 BSI 11-1999 1 1 Scope This Part of BS4427 describes a method for the determination of loss on ignition of sodium tripolyphosphate and sodium pyrophosphate for industrial use. 2 Principle The principle of this method of test is ignition at550 25 C to cons

12、tant mass. 3 Apparatus Ordinary laboratory apparatus with the following shall be used: 3.1 Porcelain crucible, approximately25mm in diameter. 3.2 Electric furnace, regulated at550 25 C. 4 Procedure 4.1 Test portion. Weigh to the nearest milligramme, approximately5g of the test sample, into the porce

13、lain crucible (3.1) previously ignited at550 C, cooled in a desiccator and weighed. 4.2 Determination. Place the crucible containing the test portion (4.1) in the furnace (3.2), start heating and progressively raise the temperature to550 25 C. Maintain it at this temperature for about1h. Then remove

14、 the crucible from the furnace and place it in a desiccator. Weigh after cooling. Repeat the heating to550 25 C to constant mass. 5 Expression of results Loss on ignition expressed as a percentage by mass, is given by the following formula: 6 Test report State the following in the report: 1) the ref

15、erence 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. where m 1 is the mass, in grammes, of crucible and test sample before ignition, m 2 is the mass

16、, in grammes, of crucible and test sample after ignition, E is the mass, in grammes, of the test portion. m 1 m 2 E -100 2 blankBS4427-4:1969 BSI 11-1999 British Standards The following are available on application: YEARBOOK Including subject index and numerical list of British Standards15s. SECTION

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