BS-5711-6-1979 ISO-2098-1972.pdf
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1、BRITISH STANDARD BS 5711-6: 1979 ISO 2098:1972 Methods of Sampling and test for glycerol Part 6: Determination of ash: gravimetric method ISO title: Glycerols for industrial use Determination of ash Gravimetric method NOTEIt is recommended that this Part of BS 5711 be read in conjunction with the ge
2、neral 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 15:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-6:1979 This British Standard, having been prepared under the direction of
3、 the Chemicals Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 November 1979 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CIC/6 Draft for comment 75/53579 DC ISBN 0 580 10987 9 National for
4、eword This Part of BS 5711 is identical with ISO 2098 “Glycerols for industrial use Determination of 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 their correct application. Complianc
5、e 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 (see copyright date) and may have h
6、ad 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 15:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-6:1979 BSI 11-1999
7、i Contents Page National forewordInside front cover 1Scope and field of application1 2Reference1 3Principle1 4Apparatus1 5Sampling1 6Procedure1 7Expression of results1 8Test report1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:03:03 GMT+00:00 20
8、06, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-6:1979 BSI 11-19991 1 Scope and field of application This International Standard specifies a gravimetric method for the determination of the ash
9、of glycerols for industrial use. This method is a conventional one. 2 Reference ISO 2096, Glycerols for industrial use Methods of sampling. 3 Principle Combustion of the test portion, ignition of the organic matter and weighing of the inorganic residue. 4 Apparatus Ordinary laboratory apparatus and
10、4.1 Platinum dish, 70 to 90 mm diameter and 40 to 50 mm high. 4.2 Muffle furnace, capable of being controlled at 750 10 C. 5 Sampling Prepare the laboratory sample as described in ISO 2096. 6 Procedure 6.1 Test portion Heat the dish (4.1) for a few minutes in the furnace (4.2) regulated at 750 10 C,
11、 cool it to room temperature in a desiccator and weigh it to the nearest 0.001 g. Then weigh into the tared dish, to the nearest 0.01 g, 5 to 100 g of the laboratory sample according to the expected amount of ash (from greater than 1 % to less than 0.01 %). 6.2 Determination Gently heat the dish (4.
12、1) containing the test portion (6.1), over a small flame until the vapours are ignited. Turn off the heat and allow the glycerol to burn until a carbonaceous mass is obtained. After cooling for 1 to 2 min, place the dish (4.1), for 10 min, in the furnace (4.2) regulated at 750 10 C. Cool the dish an
13、d contents in a desiccator and then weigh them to the nearest 0.001 g. 7 Expression of results Ash is given, as a percentage by mass, by the formula: where m1is the mass, in grams, of the empty dish (4.1); m2is the mass, in grams, of the dish containing the ash; m3is the mass, in grams, of the dish
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