BS-5711-12-1979.pdf
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1、BRITISH STANDARD CONFIRMED AUGUST 1994 BS 5711-12: 1979 Methods of Sampling and test for glycerol Part 12: Determination of chloride content NOTEIt is recommended that this Part of BS 5711 be read in conjunction with the general information given in BS 5711-0 “General introduction”, issued separatel
2、y. UDC 661.188.1:547.426.1:543.062:546.131 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:10:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-12:1979 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was published under the authorit
3、y 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 75/73579 DC ISBN 0 580 10993 3 A British Standard does not purport to include all the necessary provisions of a
4、 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, pages i and ii, pages 1 and 2, an inside b
5、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. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun,
6、 na, Mon Dec 04 15:10:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-12:1979 BSI 12-1999i Contents Page 1Scope and field of application1 2References1 3Principle1 4Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Calculation1 9Test report1 Publications referred toInside back cover Licensed Copy:
7、sheffieldun sheffieldun, na, Mon Dec 04 15:10:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:10:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-12:1979 BSI 12-19991 1 Scope and field of application This British Standard describe
8、s a titrimetric method for the determination of the chloride content of technical and dynamite grade glycerols. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Principle Titration, after dilution, of a test portion with silver nitrate s
9、olution and potassium chromate as indicator. 4 Reagents The reagents used shall be of a recognized analytical grade. Distilled water complying with the requirements of BS 3978 or water of at least equal purity shall be used. 4.1 Silver nitrate, 0.01N standard volumetric solution. 4.2 Potassium chrom
10、ate, 5 % (m/m) solution. 5 Apparatus Burette, 50 ml, complying with the requirements of class A of BS 846. 6 Sampling Prepare the laboratory sample as described in Part 2 of this British Standard. 7 Procedure Weigh, to the nearest 0.1 g, about 50 g of the sample into a 500 ml conical flask, add appr
11、oximately 200 ml of water and 5 drops of the potassium chromate solution (4.2). Titrate with the silver nitrate solution (4.1) until the solution just turns to a permanent reddish-pink colour. NOTEIt is advisable that all tests should be carried out in duplicate. 8 Calculation Calculate the chloride
12、 content, expressed as percentage by mass of sodium chloride (NaCl), from the formula where 9 Test report The test report shall include the following particulars: a) a reference to this British Standard; b) the result and the method of expression used; c) any unusual features noticed during the dete
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