1、BRITISH STANDARD BS 1715-1: 1991 Analysis of soaps Part 1: General introduction, sampling, and test for presence of synthetic anionic-active surface active agentsBS1715-1:1991 This British Standard, having been prepared under the direction of the Chemicals Standards Policy Committee, was published u
2、nder the authority of the Board of BSI and comes into effect on 31 January 1991 BSI 08-1999 First published July 1989 Second edition January 1991 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft (ref. 90/55699) announced inBSI News, November1990 ISBN
3、 0 580 19291 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/34, upon which the following bodies were represented: Chemical Industries Association Chemical Industr
4、ies Association (GOSIP) Consumer Policy Committee of BSI Department of Trade and Industry (Laboratory of the Government Chemist) Ministry of Defence Royal Society of Chemistry Soap and Detergent Industry Association Society of Dyers and Colourists Amendments issued since publication Amd. No. Date Co
5、mmentsBS1715-1:1991 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Reagents 1 3 Sampling 1 4 Preparation of samples 1 5 Test for presence of synthetic anionic-active surface active agents 2 6 Other methods 2 Table 1 Methods of analysis of soaps: structu
6、re and relationship betweenBS1715 and international standards 1 Publication(s) referred to Inside back coverBS1715-1:1991 ii BSI 08-1999 Foreword This Part of BS 1715 has been prepared under the direction of the Chemicals Standards Policy Committee. It is a revision of BS1715-1:1989, which is withdr
7、awn. BS1715 provides a series of analytical methods for soaps, other than those with added inorganic materials(e.g. sodium silicate, sodium carbonate, sodium phosphates, sodium perborate and abrasives), which may be analysed by other methods in the Parts and Sections of BS3762. BS 1715 is published
8、in two Parts, the analytical methods in Part2 being published separately as Sections. In preparing this British Standard, the opportunity was taken, if appropriate, of implementing, preferably without alteration, international standards describing test methods for soaps. These were prepared, with th
9、e active participation of the UK, by Technical Committee 91, “Surface active agents”, of the International Organization for Standardization (ISO). In this Part of BS1715, Table 1 lists the Parts and Sections of BS1715 and the analytical methods included therein and gives, if appropriate, their relat
10、ionships to the corresponding international standards. It is intended that work should continue with the object of improving existing test methods and preparing others for publication as further Sections of BS1715. A British Standard does not purport to include all the necessary provisions of a cont
11、ract. 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, pages1 and 2, an inside back co
12、ver 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.BS1715-1:1991 BSI 08-1999 1 1 Scope This Part of BS 1715 outlines, in Table 1, the present structure of BS1715 a
13、nd describes methods of sample preparation and a qualitative test for presence of synthetic anionic-active surface active agents. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Reagents During the analysis, unless otherwise stated, use only rea
14、gents of recognized analytical grade and water complying with grade 3 of BS3978. 3 Sampling NOTE 1It is not possible to give instructions which will adequately cover all instances of sampling of soap, and frequently the procedure adopted will be dictated by the experience and judgement of the author
15、ity responsible for the sampling. Place the samples immediately in an air-tight container, taking care to ensure that the sample remains in its original condition as far as possible. NOTE 2Lever-lid tins and screw-capped glass bottles are considered to be satisfactory containers. NOTE 3Analysis shou
16、ld follow sampling as soon as possible. 4 Preparation of samples 4.1 Bars, cakes or tablets Cut the bar, cake or tablet into eight parts by three cuts at right angles to each other and intersecting at the centre. Slice or grate finely the whole of two diagonally opposite eighths, mix thoroughly and
17、place in an air-tight container. 4.2 Soft soap Mix the sample well by kneading and weigh all portions for analysis at one time, preserving the remainder in an air-tight container. Table 1 Methods of analysis of soaps: structure and relationship between BS1715 and international standards BS 1715 Subj
18、ect Corresponding international standard Relationship of international standard to BS test method Part Section number 1. General introduction, sampling, and test for presence of synthetic anionic-active surface active agents Introduction, sample preparation, qualitative test 2. Quantitative test met
19、hods 2.1 Total alkali and total fatty matter content 685 Identical 2.2 Total free alkali content 684 Identical 2.3 Free caustic alkali content 456 Identical 2.4 Free fatty acids content 2.5 Unsaponifiable, unsaponified, and unsaponified saponifiable matter contents 1067 Identical 2.6 Moisture and vo
20、latile matter content 672 Identical 2.7 Chloride content 4323 Identical 2.8 Glycerol content 1066 Identical 2.9 EDTA content 4325 Related 2.10 Not allotted 2.11 Ethanol-insoluble matter content 673 IdenticalBS1715-1:1991 2 BSI 08-1999 4.3 Other samples Take portions for analysis direct from the well
21、-mixed sample. 5 Test for presence of synthetic anionic-active surface active agents 5.1 Reagents 5.1.1 Chloroform 5.1.2 Sulphuric acid solution, c(H 2 SO 4 ) = 2.5 mol/L. 5.1.3 Mixed indicator 5.1.3.1 Dimidium bromide-acid blue 1 stock solution. This solution is prepared from dimidium bromide (3,8-
22、diamino-5-methyl-6-phenyl- phenanthridinium bromide), and acid blue1(CI42045) (sodium -4-(diethylamino)phenyl- -4- (diethylamino)cyclohexa-2,5-dienylidene toluene-2,4-disulphonate). NOTEThis solution is available commercially under the name “Dimidium bromide-disulphine blue indicator stock solution”
23、. Weigh 0.5 0.005 g of dimidium bromide into a50mL beaker and 0.25 0.005 g of acid blue1into a second50mL beaker. Add between20mL and30mL of hot10% (V/V) ethanol solution in water to each beaker. Stir until dissolved and transfer the solutions to a250mL one-mark volumetric flask. Rinse the beakers i
24、nto the volumetric flask with the ethanol solution and dilute to the mark with10% (V/V) ethanol solution. 5.1.3.2 Mixed acid indicator solution. Add 200 mL of water to20mL of the stock solution (5.1.3.1) in a500mL one-mark volumetric flask. Add20mL of the sulphuric acid solution (5.1.2), mix and dil
25、ute to the mark with water. Store out of direct sunlight. 5.2 Procedure Dissolve approximately0.3 g of the sample(seeclause4) in20mL of water. Add1mL of the sulphuric acid solution (5.1.2),5mL of the mixed acid indicator solution (5.1.3.2) and5mL of the chloroform (5.1.1). Shake well. A distinct pin
26、k colour in the chloroform layer denotes the presence of a synthetic anionic-active surface active agent. 6 Other methods In addition to the methods listed inTable 1, other British Standards appropriate for the analysis of soaps include BS684-2.34 and BS684-2.35.BS1715-1:1991 BSI 08-1999 Publication
27、(s) referred to BS 684, Methods of analysis of fats and fatty oils. BS 684-2.34, Preparation of methyl esters of fatty acids. BS 684-2.35, Analysis by gas-liquid chromatography of methyl esters of fatty acids. BS 3762, Analysis of formulated detergents 1) . BS 3978, Specification for water for labor
28、atory use. ISO 456, Surface active agents Analysis of soaps Determination of free caustic alkali. ISO 672, Soaps Determination of moisture and volatile matter content Oven method. ISO 673, Soaps Determination of content of ethanolinsoluble matter. ISO 684, Analysis of soaps Determination of total fr
29、ee alkali. ISO 685, Analysis of soaps Determination of total alkali content and total fatty matter content. ISO 1066, Analysis of soaps Determination of glycerol content Titrimetric method. ISO 1067, Analysis of soaps Determination of unsaponifiable, unsaponified and unsaponified saponifiable matter
30、. ISO 4323, Soaps Determination of chlorides content Potentiometric method. ISO 4325, Soaps and detergents Determination of chelating agent content Titrimetric method. 1) Referred to in the foreword only.BS 1715-1: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is t
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