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1、BRITISH STANDARD BS 5711-5: 1979 Methods of Sampling and test for glycerol Part 5: Determination of alkalinity or acidity: volumetric method 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 661.188.1:547.426.1:543:241 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-5:1979 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was published under the authority of the
3、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 10986 0 Foreword This British Standard differs from the related ISO 1615 in the following particu
4、lars. 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 British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comp
5、rises 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 had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 5711-5ISO 1615 C
6、oncentration of sodium hydroxide, volumetric standard solution 0.01N0.1N Concentration of hydrochloric acid, volumetric standard solution 0.01N0.1N Mass of test portion100 g10 g Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 1
7、5:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-5:1979 BSI 12-1999i Contents Page ForewordInside front cover 1Scope1 2References1 3Principle1 4Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Calculation1 9Test report1 Publications referred toInside back cover Licensed Copy: sheffieldun shef
8、fieldun, na, Mon Dec 04 15:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-5:1979 BSI 12-19991 1 Scope This British Standard specifies a volumetric method for the determinatio
9、n of the alkalinity or acidity of technical, dynamite grade and chemically pure glycerol. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Principle Titration of a test portion with hydrochloric acid or sodium hydroxide solution. 4 Reage
10、nts The reagents used shall be of a recognized analytical reagent quality. Distilled water complying with the requirements of BS 3978 or water of at least equal purity and free from carbon dioxide shall be used. (See Part 1 of this British Standard.) 4.1 Sodium hydroxide, 0.01N standard volumetric s
11、olution. 4.2 Hydrochloric acid, 0.01N standard volumetric solution. 4.3 Phenolphthalein indicator solution. Prepared as described in BS 4123. Add 0.2N sodium hydroxide solution cautiously until a faint pink colour persists. 5 Apparatus 5.1 Burette, 50 ml, complying with the requirements of class A o
12、f 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 100 g of the well mixed laboratory sample, into a 500 ml conical flask and add 150 ml of the water and 4 drops of the indicator solution (4.3). Determine
13、 the acidity or alkalinity by titration with the sodium hydroxide solution (4.1) or the hydrochloric acid solution (4.2) respectively. NOTEIt is advisable that all tests should be carried out in duplicate. 8 Calculation a) Calculate the acidity, expressed as milliequivalents per 100 g, from the form
14、ula: b) Calculate the alkalinity, expressed as milliequivalents per 100 g, 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 noted during the
15、 determination; d) any operation not included in this British Standard or regarded as optional. or V1is the volume of the sodium hydroxide solution used for the titration (ml) V2is the volume of the hydrochloric acid solution used for the titration (ml) mis the mass of test portion (g) V1 m - - V2 m
16、 - - Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-5:1979 BSI 12-1999 Publications referred to BS 846, Burettes and
17、bulb burettes. BS 3978, Water for laboratory use. BS 4123, Schedule of preferred chemical indicators. BS 5711, Methods of sampling and test for glycerol. BS 5711-1, Samples and test methods: general. BS 5711-2, Methods of sampling. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:46 GMT+
18、00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-5: 1979 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is inc
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