1、BRITISH STANDARD BS 5072-2: 1974 Incorporating Amendment No. 1 Methods of test for Sodium fluoride for industrial use Part 2: Determination of moisture content UDC 661.833.361:546.33131:543.712BS5072-2:1974 This British Standard, having been approved by the ChemicalsIndustry StandardsCommittee, wasp
2、ublished under theauthorityofthe ExecutiveBoardon 31July1974 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 72/52985 DC ISBN 0 580 08432 9 Co-operating organizations The Chemicals Industry Standards Committee, under whose su
3、pervision this British 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* Departme
4、nt of Trade and 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 wi
5、th an asterisk 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 Chemic
6、al Industry Amendments issued since publication Amd. No. Date of issue Comments 5347 March 1987 Indicated by a sideline in the marginBS5072-2:1974 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 Expression of
7、 results 1 Publications referred to Inside back coverBS5072-2:1974 ii BSI 11-1999 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, acco
8、unt has been taken of the method adopted by the International Organization 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 partic
9、ular, ISO/TC47/SC7 Alumina and related compounds, advances. This Part is based on International Standard ISO2832, “Sodium fluoride for industrial use. Determination of moisture content”, modified to take into account the comments made by the UnitedKingdom during its development. This standard prescr
10、ibes methods of test only, and should not be used or 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 BS5072-2. A British Standard does not purport to include all the necessary provisions o
11、f 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, pagesi andii, pages1 and 2, an inside b
12、ack 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.BS5072-2:1974 BSI 11-1999 1 1 Scope This Part of this British Standard specifies a gravimetric method for
13、the determination of the moisture content of sodium fluoride for industrial use. NOTEThe title of the British Standard referred to in this standard is given on the inside back cover. 2 Principle A test portion is dried for2h at110 C and the loss of mass is determined. 3 Apparatus Ordinary laboratory
14、 apparatus and the following items are required. 3.1 Weighing bottle. This shall be shallow and approximately45mm in diameter. 3.2 Electric oven. Ventilated by convection and capable of being controlled at110 2 C (seeBS2648). 4 Procedure 4.1 Test portion. Dry the weighing bottle (see3.1) to constant
15、 mass in the oven (see3.2), controlled at110 2 C transfer it to a desiccator and after cooling to ambient temperature, weigh to the nearest0.001g. Then weigh, to the nearest0.001g, into the tared weighing bottle, approximately20g of the crude test sample 1) . 4.2 Determination. Place the uncovered w
16、eighing bottle, together with its lid, in the oven (see3.2), controlled at110 2 C, and maintain at this temperature for2h. Remove the weighing bottle and its lid from the oven and place them in a desiccator, without closing the weighing bottle completely. After cooling to ambient temperature close t
17、he weighing bottle with its lid and weigh to the nearest0.001g. Repeat the operations of heating, cooling and weighing until the difference between two successive weighings does not exceed2mg. 5 Expression of results The moisture content is given, as a percentage by mass, by the formula: where 1) Se
18、e BS 5072-4. m 0 is the mass of the weighing bottle, and its lid(g); m 1 is the mass of the weighing bottle, its lid and the test portion before drying (g); m 2 is the mass of the weighing bottle, its lid and the test portion after drying (g).2 blankBS5072-2:1974 BSI 11-1999 Publications referred to
19、 This standard makes reference to the following British Standards: BS 2648, Performance requirements for electrically-heated laboratory drying ovens. BS 5072, Methods of test for sodium fluoride for industrial use. BS 5072-4, Preparation and storage of samples. BS 5072-2: 1974 BSI 389 Chiswick High
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