BS 1715-2.2-1989 ISO 684-1974.pdf
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1、BRITISH STANDARD BS 1715-2.2: 1989 ISO 684:1974 Analysis of soaps Part 2: Quantitative test methods Section 2.2 Method for determination of total free alkali content ISO title: Analysis of soaps Determination of total free alkali UDC 661.18:661.3:543 Licensed Copy: sheffieldun sheffieldun, na, Fri N
2、ov 24 08:03:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1715-2.2:1989 This British Standard, having been prepared under the direction of the Chemicals Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1989 BSI 08-1999 The followin
3、g BSI references relate to the work on this standard: Committee reference CIC/34 Draft for comment 88/53279 DC ISBN 0 580 17288 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical C
4、ommittee CIC/34, upon which the following bodies were represented: Chemical Industries Association Consumer Policy Committee of BSI Department of the Environment Department of Trade and Industry (Laboratory of the Government Chemist) Ministry of Defence Royal Society of Chemistry Soap and Detergent
5、Industry Association Society of Dyers and Colourists Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:03:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1715-2.2:1989 BSI 08-1999i Contents Page Committees responsibleInside f
6、ront cover National forewordii 1Scope1 2References1 3Definition1 4Principle1 5Reagents1 6Apparatus1 7Sampling1 8Procedure1 9Expression of results1 10Test report2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:03:41 GMT+00:00 2006, Uncontrolled Cop
7、y, (c) BSI BS 1715-2.2:1989 ii BSI 08-1999 National foreword This Section of BS 1715 has been prepared under the direction of the Chemicals Standards Policy Committee. It is identical with ISO 684:1974 “Analysis of soaps Determination of total free alkali” published by the International Organization
8、 for Standardization (ISO). This method supersedes the method for determination of total free alkali given in BS 1715:1963, which is deleted by amendment. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without d
9、eviation. Some terminology and certain conventions are not identical with those used in British 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 marke
10、r. The symbol “ml” has been used to denote millilitre. In British Standards it is current practice to use the symbol “mL”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS 1715”. The International Standard for sampling of soaps (se
11、e clause 2 and clause 7) is not yet published. Relevant information is included in BS 1715 “Analysis of soaps”, Part 1:1989 “General introduction, sampling, and test for presence of synthetic anionic-active surface active agents”. Additional information. With reference to clause 5, water complying w
12、ith grade 3 of BS 3978 “Specification for water for laboratory use” is suitable. With reference to 5.2, the sulphuric acid standard volumetric solution, expressed as an amount-of-substance concentration, is c(“H2SO4) = 1 mol/L. With reference to 5.3, the potassium hydroxide standard volumetric solut
13、ion, expressed as an amount-of-substance concentration, is c(KOH) = 0.1 mol/L. In the definitions of T0 and T1 in 9.1, “normality” should be read as “amount-of-substance concentration (mol/L)”. In the penultimate paragraph of 9.1, “milliequivalents” should be read as “millimoles”. For the purposes o
14、f 5.1 the ethanol may be replaced by industrial methylated spirits complying with BS 3591 “Specification for industrial methylated spirits” of appropriate strength. It should be noted that the use of industrial methylated spirits is governed by The Methylated Spirits Regulations, 1983 (S.I. 1983 No.
15、 252). It is not permissible to use duty-free ethanol, received under the provisions of the Alcoholic Liquors Duties Act 1972, Section 10, for purposes for which industrial methylated spirits is an acceptable alternative. Cross-reference International Standard Corresponding British Standard ISO 685:
16、1975BS 1715 Analysis of soaps Section 2.1:1989 Method for determination of total alkali content and total fatty matter content (Identical) Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:03:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1715-2.2:1989 BSI 08-1999iii This Section describes
17、 a method of test only, and should not be used or quoted as a specification defining limits of purity. Reference to this Section should indicate that the method of test used is in accordance with BS 1715-2.2. A British Standard does not purport to include all the necessary provisions of a contract.
18、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 to iv, pages 1 and 2, an inside back cover an
19、d 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:03:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank L
20、icensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:03:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1715-2.2:1989 BSI 08-19991 1 Scope and field of application This International Standard specifies a method for the determination of the total free alkali content of commercial soaps, excludin
21、g compounded products1). The method is not applicable if the soap contains additives (alkali silicates, etc.) which can be decomposed by sulphuric acid by the procedure specified. The method is also not applicable to coloured soaps if the colour interferes with the phenolphthalein end point. 2 Refer
22、ences ISO 685, Analysis of soaps Determination of total alkali2). ISO . . ., Soaps Sampling3). 3 Definition For the purpose of this International Standard, the following definition applies: 3.1 total free alkali the sum of the free caustic alkali and the free carbonate alkali contents the results ar
23、e generally expressed as a percentage by mass as either sodium hydroxide (NaOH) for sodium soaps or potassium hydroxide (KOH) for potassium soaps they may also be expressed in milliequivalents per gram 4 Principle Dissolution of the soap in an ethanolic solution, neutralization of the free alkali wi
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