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1、BRITISH STANDARD BS 5711-7: 1979 ISO 1616:1976 Methods of Sampling and test for glycerol Part 7: Determination of sulphated ash: gravimetric method ISO title: Glycerines for industrial use Determination of sulphated ash Gravimetric method NOTEIt is recommended that this Part of BS 5711 be read in co
2、njunction with the general information given in BS 5711-0 “General introduction”, issued separately. UDC 661.188.1:547.426.1:543.822 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-7:1979 This British Standard, having been prepared u
3、nder the direction of the Chemicals Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 November 1979 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/6 Draft for comment 75/53579 DC ISBN 0 580
4、 10988 7 National foreword This Part of BS 5711 is identical with ISO 1616 “Glycerines for industrial use Determination of sulphated ash Gravimetric method”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for thei
5、r 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, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (se
6、e copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c
7、) BSI BS 5711-7:1979 BSI 12-1999i Contents Page National forewordInside front cover 1Scope and field of application1 2References1 3Principle1 4Reagent1 5Apparatus1 6Procedure1 7Expression of results1 8Test report1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na,
8、Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-7:1979 BSI 12-19991 1 Scope and field of application This International Standard specifies a gravimetric method f
9、or determining sulphated ash deriving from glycerines for industrial use. The method is applicable to products yielding a quantity of sulphated ash less than or equal to 0,5 % (m/m). 2 References ISO 1614, Glycerines for industrial use Samples and test methods General. ISO 2096, Glycerines for indus
10、trial use Methods of sampling. 3 Principle Combustion of a test portion and calcination of the residue in the presence of sulphuric acid, between 800 and 850 C. Weighing of the sulphated ash thus obtained. 4 Reagent During the analysis, use only reagents of recognized analytical reagent grade. 4.1 S
11、ulphuric acid, approximately 1,84 g/ml, about 96 % (m/m) solution, or approximately 36 N. 5 Apparatus Ordinary laboratory apparatus and 5.1 Platinum or porcelain dish, diameter 70 to 90 mm and height 25 to 50 mm. 5.2 Electric furnace, capable of being controlled at 800 to 850 C. 6 Procedure 6.1 Test
12、 portion Heat the dish (5.1) for several minutes in the furnace (5.2) controlled between 800 and 850 C, allow it to cool to ambient temperature in a desiccator and weigh to the nearest 0,001 g. Weigh 50 0,1 g of the test sample to the nearest 0,01 g, in the previously weighed dish (see ISO 1614). 6.
13、2 Determination Gently heat the dish containing the test portion (6.1) over a small flame, avoiding sputtering, and ignite the vapour. Stop the heating and allow to burn until a carbonaceous mass is obtained. After cooling, moisten the residue with a few drops of the sulphuric acid solution (4.1) an
14、d remove the excess acid by heating until the white fumes disappear and combustible material is burned away. Repeat this operation and then place the dish for 5 min in the furnace (5.2) controlled between 800 and 850 C. Allow to cool in a desiccator to ambient temperature and weigh to the nearest 0,
15、001 g. 7 Expression of results The sulphated ash is given, as a percentage by mass, by the formula: where m0is the mass, in grams, of the test portion (6.1); m1is the mass, in grams, of the empty dish (5.1); m2is the mass, in grams, of the dish containing the sulphated ash. 8 Test report The test re
16、port shall include the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) all operations not included in this International Standard or the International Standards to which reference
17、 is made, or regarded as optional. m2m1() 100 m0 - - Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-7:1979 BSI 12-199
18、9 Publications referred to See Part 0 “General introduction”. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:09:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-7: 1979 ISO 1616:1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nat
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