1、BRITISH STANDARD BS 6392-9: 1983 Incorporating Amendment Nos. 1 and 2 Testing of ethanol for industrial use Part 9: Method for determination of permanganate time NOTEIt is recommended that this Part be read in conjunction with the information given in the “General introduction” published separately
2、as BS 6392-0. UDC 661.722:543.869BS6392-9:1983 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31August1983 BSI 10-1999 The Committees responsible for this British Standa
3、rd are shown inPart0. The following BSI references relate to the work on this standard: Committee reference CIC/4 Draft for comment 80/51209 DC ISBN 0 580 13375 3 Foreword This Part of BS 6392 is technically equivalent to ISO1388“Ethanol for industrial use Methods of test” Part12“Determination of pe
4、rmanganate time”, published in1981by the International Organization for Standardization (ISO). For ease of production, the text of ISO1388-12:1981,with the omission of the Annex, has been used for this British Standard. Some terminology and certain conventions are not identical with those used in Br
5、itish 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 the baseline as the decimal marker. This standard describes a method only and should not be used as a specification definin
6、g limits of purity. Reference to the standard should indicate that the method of test used is in accordance with BS6392-9. 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 w
7、ith 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, pages1and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
8、ndments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue Comments 4945 March 1986 7764 June 1993 Indicated by a sideline in the marginBS6392-9:1983 BSI 10-1999 i Contents Page Foreword Inside front cover
9、 1 Scope and field of application 1 2 Definition 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 1 Publication referred to Inside back coverii blankBS6392-9:1983 BSI 10-1999 1 1 Scope and field of application This Part of BS6392describes a method for the determinatio
10、n of the permanganate time of ethanol for industrial use. NOTEThe title of the publication referred to in this standard is given on the inside back cover. 2 Definition permanganate time the number of minutes required, after adding2ml of0,2g/l potassium permanganate solution to50ml of the sample, for
11、 the colour to match that of a colour standard 3 Principle Addition to a test portion, under specified conditions, of potassium permanganate solution. Determination of the time taken for the colour of this test solution to match that of a cobalt(II) chloride and uranyl nitrate colour standard. 4 Rea
12、gents During the analysis, unless otherwise specified, use only reagents of recognized analytical grade, and distilled water or water of equivalent purity. 4.1 Potassium permanganate, 0,2g/l solution. Use water previously boiled for30min with sufficient dilute potassium permanganate solution to give
13、 a stable faint pink coloration. Cool the water before preparation of the solution. Prepare this solution immediately before use and protect it from light. 4.2 Cobalt(II) chloride and uranyl nitrate, colour standard. To 5 ml of a 50 g/l solution of cobalt(II) chloride hexahydrate (CoCl 2 .6H 2 O), a
14、dd7ml of a40g/l solution of uranyl nitrate hexahydrate UO 2 (NO 3 ) 2 .6H 2 O, and dilute with water to50ml. WARNING. Uranyl nitrate is radioactive and it is essential that appropriate precautions are taken. The use of uranyl nitrate is subject to the Ionizing radiations regulations SI1985, No. 1333
15、and any amendments thereof which are currently in force. Prepare this solution on the day of use. 5 Apparatus NOTEClean the glassware used so as to avoid any risk of contamination. Ordinary laboratory apparatus, and 5.1 Water bath, capable of being controlled at15 0,2 C. 5.2 Two matched cylinders, o
16、f capacity100ml, of transparent and colourless glass, graduated at50ml and fitted with ground glass stoppers. 5.3 Burette, of capacity10ml, graduated in0,05ml divisions. 6 Procedure 6.1 Test portion Carry out the test as soon as possible after receipt of the sample. (Instructions for the storage of
17、the sample are given in BS6392-0) Rinse one of the cylinders (5.2), first with15to20ml of hydrochloric acid, approximately1,18 g/ml, about36% (m/m) solution, then six times with tap water, twice with distilled water and finally with some of the laboratory sample. Immediately fill the cylinder to the
18、 mark with more of the laboratory sample at a temperature of about15 C. 6.2 Determination Fill the second cylinder (5.2) to the mark with the colour standard (4.2). Place the cylinder containing the test portion (6.1) in the water bath (5.1), controlled at15 0,2 C, so that the water level in the bat
19、h is approximately25mm below the neck of the cylinder. After15min, remove the cylinder from the water bath and, using the burette (5.3), add2,0ml of the potassium permanganate solution (4.1). Note the time. Immediately stopper the cylinder, shake, and replace it in the water bath. Remove the cylinde
20、r from the water bath, at intervals of1min and compare the colour, viewing vertically downwards against a white background, with the colour of the colour standard. Avoid exposing the test solution to strong daylight. Note the time at which the colour of the test solution matches that of the colour s
21、tandard. 7 Expression of results Report the time, in minutes, from the addition of the potassium permanganate solution, for the colour of the test solution to match that of the colour standard.2 blankBS6392-9:1983 BSI 10-1999 Publication referred to BS 6392, Testing of ethanol for industrial use. BS
22、 6392-0, General introduction. BS 6392-9: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by
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