BS 6829-1 3-1988 Analysis of surface active agents (raw materials) - General methods - Method for determination of alkalinity《表面活性剂(原料)的分析 一般方法 碱度测定方法》.pdf

1、BRITISH STANDARD BS 6829-1.3: 1988 ISO 4315:1977 Analysis of surface active agents (raw materials) Part 1: General methods Section 1.3 Method for determination of alkalinity ISO title: Surface active agents Determination of alkalinity Titrimetric method UDC 661.185.1:543.2 112BS6829-1.3:1988 This Br

2、itish Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31August1988 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for c

3、omment 87/53367 DC ISBN 0 580 16685 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC/34, upon which the following bodies were represented: Chemical Industries Association

4、Consumer Policy Committee of BSI Department of the Environment Department of Trade and Industry (Laboratory of the Government Chemist) London Regional Transport Ministry of Defence Royal Society of Chemistry Soap and Detergent Industry Association Society of Dyers and Colourists Society of Occupatio

5、nal Medicine Textile Institute Textile Research Council Amendments issued since publication Amd. No. Date of issue CommentsBS6829-1.3:1988 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Reference 1 3 Pr

6、inciple 1 4 Reagents 1 5 Apparatus 1 6 Sampling 1 7 Procedure 1 8 Expression of results 1 9 Test report 1 Publications referred to Inside back coverBS6829-1.3:1988 ii BSI 12-1999 National foreword This Section of BS 6829 has been prepared under the direction of the Chemical Standards Committee. It i

7、s identical with ISO4315:1977 “Surface active agents Determination of alkalinity Titrimetric method”, published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British

8、Standard without deviation. 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

9、 the decimal marker. The symbol “l” has been used to denote litre (and in its submultiples). In BritishStandards it is current practice to use the symbol “L”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS6829”. The footnote to c

10、lause2 should be deleted. With reference to5.2, ISO385 has been revised as ISO385-1:1984, ISO 385-2:1984 and ISO 385-3:1984, the relevant requirements of which are technically equivalent to those in BS846:1985 “Specification for burettes”. Additional information. With reference to clause4, water com

11、plying with grade3 of BS3978 “Specification for water for laboratory use” is suitable. With reference to4.1, the concentration of the hydrochloric acid standard volumetric solution, expressed as an amount-of-substance concentration, is c (HCl) = 0.1 mol/L. In the definition of T in clause8, “normali

12、ty” should be read as“amount-of-substance concentration (mol/L)”. This Section describes 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 BS6829-1.3. A Bri

13、tish 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. Cross-references International Standard Corres

14、ponding British Standard ISO 607:1980 BS 3762 Analysis of formulated detergents Part 1:1983 Methods of sample division (Identical) ISO 1773:1976 BS 2734:1984 Specification for boiling flasks (narrow-necked), conical, flat bottom and round bottom (Identical) Summary of pages This document comprises a

15、 front cover, an inside front cover, pagesi andii, pages1 and2, 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.BS6829-1.3:1988 BSI 12-1999 1 0

16、 Introduction Solutions, pastes and powders of organic surface active substances, in particular those which contain hydrolysable products, can become weakly alkaline as a result of various breakdown reactions. The method specified in this International Standard is based on the determination of the a

17、lkalis in the form of carbonates, bicarbonates, alkali hydroxides or free organic bases such as triethanolamine. 1 Scope and field of application This International Standard specifies a titrimetric method for the determination of the alkalinity of surface active agents in general. This method is app

18、licable only if so indicated in the specific standard for each product; in particular it is not suitable for products containing soaps. 2 Reference ISO 607, Surface active agents Detergents Methods of sample division 1) . 3 Principle Titration of a clear solution of the surface active agent with a s

19、tandard volumetric hydrochloric acid solution, in the presence of methyl orange or bromophenol blue as indicator. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrochloric acid, 0,1 N standard volumetric

20、solution. 4.2 Methyl orange or bromophenol blue, 1 g/l solution. 5 Apparatus Ordinary laboratory apparatus, and in particular: 5.1 Conical flask, capacity 250ml, complying with the requirements of ISO1773. 5.2 Burette, capacity 10ml, complying with the requirements of class A of ISO385. 6 Sampling T

21、he laboratory sample of the surface active agent shall be prepared and stored according to the instructions given in ISO 607. 7 Procedure 7.1 Test portion Weigh, to the nearest 0,001g, about 5g of the laboratory sample into the conical flask (5.1). 7.2 Determination Add 50 ml of water to the test po

22、rtion (7.1) and dissolve or homogenize if necessary. Then add2 drops of the indicator solution (4.2) and titrate with the hydrochloric acid solution (4.1) until the end-point is reached. NOTETo facilitate the colour comparison, prepare by the same procedure a solution of about5g of the laboratory sa

23、mple in50ml of water and add2 drops of the indicator solution (4.2). 8 Expression of results The alkalinity of the product, expressed as a percentage by mass of sodium oxide (Na 2 O), is given by the formula where V is the volume, in millilitres, of the standard volumetric hydrochloric acid solution

24、 (4.1) used; T is the exact normality of the standard volumetric hydrochloric acid solution (4.1) used; m is the mass, in grams, of the test portion. 9 Test report The test report shall include the following particulars: a) all information necessary for the complete identification of the sample; b)

25、the reference of the method used; c) the results obtained and the form in which they are expressed; d) the test conditions; e) any operation not included in this International Standard or regarded as optional, as well as any incidents which may have affected the results. 1) In preparation. (Revision

26、 of ISO/R 607.) VT 3,1 m -2 blankBS6829-1.3:1988 BSI 12-1999 Publications referred to See national foreword.BS 6829-1.3: 1988 ISO4315:1977 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It prese

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