1、BRITISH STANDARD BS 1715-2.6: 1989 ISO 672:1978 Analysis of soaps Part 2: Quantitative test methods Section 2.6 Method for determination of moisture and volatile matter content ISO title: Soaps Determination of moisture and volatile matter content Oven method UDC 661.18:543BS1715-2.6:1989 This Briti
2、sh Standard, having been prepared under the directionof the ChemicalsStandards Policy Committee,waspublished underthe authorityof the BoardofBSI andcomes into effect on 31 July 1989 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for com
3、ment 88/53276 DC ISBN 0 580 17320 8 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 the following bodies were represented: Chemical Industries Associa
4、tion Consumer 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 Association Society of Dyers and Colourists Amendments issued since publication Amd.
5、No. Date of issue CommentsBS1715-2.6:1989 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Field of application 1 3 References 1 4 Principle 1 5 Apparatus 1 6 Sampling 1 7 Procedure 1 8 Expression of results 1 9 Test Report 2 Publications referre
6、d to Inside back coverBS1715-2.6:1989 ii BSI 09-1999 National foreword This Section of BS1715 has been prepared under the direction of the Chemicals Standards Policy Committee. It is identical with ISO672:1978 “Soaps Determination of moisture and volatile matter content Oven method” published by the
7、 International Organization for Standardization (ISO). This method supersedes the method “Determination of loss on drying at100105 C” given in BS1715:1963, which is deleted by amendment. Terminology and conventions. The text of the International Standard has been approved as suitable for publication
8、 as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on t
9、he baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS1715”. Cross-references. There is no British Standard corresponding to ISO4318 (seeclauses1 and3) but, as this reference is supplied only for inform
10、ation, the validity of this British Standard is not affected. Attention is drawn to BS3762“Analysis of formulated detergents”, Section3.25 “Methods for determination of water and volatile matter content” 1) . The International Standard for sampling of soaps (see clause3 and clause6) is not yet publi
11、shed. Relevant information is included in BS1715 “Analysis of soaps”, Part1:1989 “General introduction, sampling, and test for presence of synthetic anionic-active surface active agents”. This Section describes a method of test only, and should not be used or quoted as a specification defining limit
12、s of purity. Reference to this Section should indicate that the method of test used is in accordance with BS1715-2.6. 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
13、 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 updated (see copyright date) and may have had amendment
14、s incorporated. This will be indicated in the amendment table on the inside front cover. 1) In preparation.BS1715-2.6:1989 BSI 09-1999 1 1 Scope This International Standard specifies an oven method for the determination of the moisture and volatile matter content of commercial soaps, excluding compo
15、unded products. NOTEAttention is drawn to ISO4318 which specifies an azeotropic distillation method for determination of water content. 2 Field of application This method permits the determination of water and other substances present which are removed by heating at103 2 C. 3 References ISO 4318, Su
16、rface active agents and soaps Determination of water content Azeotropic distillation method. ISO . . . , Soaps Sampling 2) . 4 Principle Oven-drying of a given mass of sample to constant mass. 5 Apparatus Ordinary laboratory apparatus and in particular 5.1 Evaporating dish or crystallizing dish, of
17、diameter6 to8cm and depth2 to4cm. 5.2 Glass stirring rod 5.3 Sand, washed and calcined, or granulated pumice. 5.4 Oven, capable of being controlled at103 2 C. 5.5 Desiccator, containing an efficient desiccant, for example phosphorus(V) oxide (P 2 O 5 ). Calcium chloride is not satisfactory. 6 Sampli
18、ng The laboratory samples of soaps shall be prepared and stored according to the instructions given inISO . . . 7 Procedure 7.1 Test portion Weigh, to the nearest 0,01g, about10g of the laboratory sample. (In the case of soap bars, cut it into small pieces.) 7.2 Determination Place the stirring rod
19、(5.2) in the dish (5.1) and, only if the analysis is to be carried out on soft soap or on soap liquefiable at103 2 C, also place in the dish about10g of the sand or pumice (5.3). Dry the dish and stirring rod, with or without added sand or pumice as appropriate, in the oven (5.4), controlled at103 2
20、 C. Allow to cool in the desiccator (5.5) and weigh. Add the test portion (7.1) to the dish and, if sand or pumice is used, mix this in by means of the stirring rod. Place the dish in the oven, controlled at103 2 C. After 1 h, remove from the oven and when cool, reduce the material to a fine powder
21、by means of the stirring rod. Replace in the oven and after1h, remove the dish. Place in the desiccator and leave just long enough for it to cool completely to ambient temperature and then weigh. Repeat the operations of heating for periods of1h, cooling and weighing until the difference in mass bet
22、ween two successive weighings is less than0,01g. Note the result of the final weighing. 8 Expression of results 8.1 Method of calculation The moisture and volatile matter content is given, as a percentage by mass, by the formula where m 0is the mass, in grams, of the dish, rod and, if used, the sand
23、 or pumice; m 1is the mass, in grams, of the dish, rod, sand or pumice (if used) and the test portion before heating; m 2is the mass, in grams, of the dish, rod, sand or pumice (if used) and the test portion after heating. 8.2 Reproducibility The difference between the results obtained on the same s
24、ample in two different laboratories should not exceed0,25%. 2) In preparation. m 1 m 2 m 1 m 0 -100 BS1715-2.6:1989 2 BSI 09-1999 9 Test report The test report shall include the following particulars: a) all information necessary for the complete identification of the sample; b) the reference of the
25、 method used (reference to this International Standard); c) the results and the method of expression used; d) the test conditions; e) any operational details not specified in this International Standard or regarded as optional, as well as any incidents likely to have affected the results.BS1715-2.6:
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