1、BRITISH STANDARD BS 5072-1: 1974 Methods of Test for sodium fluoride for industrial use Part 1: Determination of water-insoluble matter UDC 661.833.361:546.33131:543.725BS5072-1:1974 This British Standard, having been approved by the Chemicals Industry Standards Committee, was published under the au
2、thorityof the Executive Boardon 31 July 1974 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 72/52985 DC ISBN 0 580 08422 1 Co-operating organizations The Chemicals Industry Standards Committee, under whose supervision this B
3、ritish Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Steel Industry* Chemical Industries Association* Department of Health and Social Security Department of Trade and Industry* Department of Trade and
4、 Industry Laboratory of the Government Chemist* Fertiliser Manufacturers Association Limited Ministry of Agriculture, Fisheries and Food National Sulphuric Acid Association Royal Institute of Public Health and Hygiene Soap and Detergent Industry Association The organizations marked with an asterisk
5、in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Aluminium Federation British Ceramic Research Association Royal Institute of Chemistry Society for Analytical Chemistry Society of Chemical Industry Ame
6、ndments issued since publication Amd. No. Date of issue CommentsBS5072-1:1974 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Reagents 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 1 Publications referred to Inside back coverBS5
7、072-1:1974 ii BSI 12-1999 Foreword This British Standard has been prepared under the authority of the Chemicals Industry Standards Committee in order to provide methods for the analysis of sodium fluoride. In the drafting of this standard, account has been taken of the method adopted bythe Internati
8、onalOrganization for Standardization (ISO), in the preparation of which the UnitedKingdom has been an active participant. It is intended to provide further methods, in the form of parts of this standard, as the work of ISO/TC47 and, in particular, ISO/TC47/SC7 Alumina and related compounds, advances
9、. This Part is based on InternationalStandard ISO2831, “Sodium fluoride for industrial use. Determination of water-insoluble matter”, modified to take into account the comments made by the UnitedKingdom during its development. This standard prescribes methods of test only, and should not be used or
10、quoted as a specification defining limits of purity. Reference to the standard should be in a form of words indicating that the methods of test used conform to BS5072-1. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsi
11、ble 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, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been upd
12、ated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5072-1:1974 BSI 12-1999 1 1 Scope This Part of this British Standard specifies a method for the determination of water-insoluble matter in sodium fluoride for
13、 industrial use. NOTEThe titles of the British Standards referred to in this standard are listed on the inside back cover. 2 Principle A test portion is dissolved in water, any insoluble matter is separated by filtration and is then dried and weighed. 3 Reagents Water complying with the requirements
14、 of BS3978, or water of equivalent purity, shall be used throughout the test. 4 Apparatus Ordinary laboratory apparatus and the following items are required. 4.1 Filter crucible. Having a sintered glass filter plate of porosity P40 (pore size index between104m and404m) (seeBS1752). 4.2 Electric oven
15、. Ventilated by convection and capable of being controlled at110 2 C (seeBS2648). 5 Procedure 5.1 Test portion. Weigh, to the nearest 0.01g, approximately5g of the dried sample 1) . 5.2 Determination. Place the test portion in a beaker of suitable capacity (for example,400ml) and dissolve it in appr
16、oximately200ml of water. Heat the solution to boiling for about10min, cool and immediately filter the solution by vacuum through the filter crucible (see4.1), previously dried for2h in the oven (see4.2), controlled at110 2 C, cooled in a desiccator and weighed. Wash the residue in the crucible four
17、times, each time with50ml of water at approximately80 C. Place the filter crucible in the electric oven (see4.2), controlled at110 2 C, and maintain at this temperature for2h. Remove the crucible from the oven, place it in a desiccator, allow to cool and weigh. Repeat the operations of heating, cool
18、ing and weighing until the difference between two successive weighings does not exceed1mg. NOTEThe time of cooling in the desiccator should be equal to that used to determine the tare of the empty crucible. 6 Expression of results The water-insoluble matter is given, as a percentage by mass, by the
19、formula: where 1) Methods for the preparation and storage of test samples of sodium fluoride are in course of preparation and will be published as a part of this standard. m 0 is the mass of the test portion (g); m 1 is the mass of the empty crucible (g); m 2 is the mass of the crucible containing t
20、he filtered and dried insoluble matter (g). m 2 m 1 () m 0 -100 2 blankBS5072-1:1974 BSI 12-1999 Publications referred to This standard makes reference to the following British Standards: BS 1752, Laboratory sintered or fritted filters. BS 2648, Performance requirements for electrically-heated labor
21、atory drying ovens. BS 3978, Water for laboratory use. BS 5072-1: 1974 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 leve
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