BS EN 14210-2003 Surface active agents Determination of interfacial tension of solutions of surface active agents by the stirrup or ring method.pdf
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1、BRITISH STANDARD BS EN 14210:2003 Surface active agents Determination of interfacial tension of solutions of surface active agents by the stirrup or ring method The European Standard EN 14210:2003 has the status of a British Standard ICS 71.100.40 ? BS EN 14210:2003 This British Standard was publish
2、ed under the authority of the Standards Policy and Strategy Committee on 19 January 2004 BSI 19 January 2004 ISBN 0 580 43294 7 National foreword This British Standard is the official English language version of EN 14210:2003. The UK participation in its preparation was entrusted to Technical Commit
3、tee CII/34, Methods of test for surface active agents, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this
4、 document may be found in the BSI Catalogue under the section entitled “ International Standards Correspondence Index” , or by using the “ Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a c
5、ontract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposal
6、s for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displaye
7、d in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14210 December 2003 ICS 71.100.40 English version Surface active agents - Determination of interfacial tension of solutions o
8、f surface active agents by the stirrup or ring method Agents de surface - Dtermination de la tension interfaciale des solution dagents de surface par la mthode lanneau ou ltrier Grenzflchenaktive Stoffe - Bestimmung der Grenzflchenspannung von grenzflchenaktiven Lsungen mittels Bgel- oder Ringverfah
9、ren This European Standard was approved by CEN on 1 October 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
10、references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member
11、 into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, N
12、orway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserv
13、ed worldwide for CEN national Members. Ref. No. EN 14210:2003 E EN 14210:2003 (E) 2 Contentspage Foreword3 1Scope 4 2Principle4 3Apparatus .4 4Preparation of apparatus 7 5Procedure .7 6Expression of results 8 7Precision.12 8Test report 12 Bibliography13 ? EN 14210:2003 (E) 3 Foreword This document E
14、N 14210:2003 has been prepared by Technical Committee CEN/TC 276 “Surface active agents”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2004, and
15、conflicting national standards shall be withdrawn at the latest by June 2004. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Cz
16、ech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. ? EN 14210:2003 (E) 4 1 Scope This European Standard specifies test methods for the determination
17、of interfacial tension in the range from 4 mN/m to 50 mN/m between two immiscible liquids which can also be free from surface active agents. It is particularly suitable for determining the interfacial tension between water or aqueous solutions and organic liquids which are immiscible with water. 2 P
18、rinciple The maximum force, F, necessary to pull or to force a stirrup or ring of length, l, out of the interface between two liquids in the direction of the nonaqueous phase is measured. The interfacial tension, ?, is obtained by calculation where the following approximate equation (1) serves as ba
19、se: l F 2 =(1) 3 Apparatus 3.1 Tensiometer 3.1.1General The tensiometer shall be designed for use with a stirrup or ring and shall consist essentially of the parts specified in 3.1.2 and 3.1.3. 3.1.2Dynamometer (e.g. torsion balance or inductive force transducer), capable for reading off the force t
20、o the nearest 0,1 mN/m over the effective length of the stirrup or ring. 3.1.3Support for the measuring vessel, consisting of a horizontal platform which can be moved vertically up and down, e.g. with the aid of a precision drive. 3.2 Stirrup The stirrup shall consist of platinum/iridium wire with a
21、 test wire diameter of 0,1 mm and a length of 20 mm to 40 mm. The length of the two branches shall be about 20 mm. Two small platinum balls can be attached to the lower ends of the branches as counterweights or, alternatively, the lower ends of the branches can be joined by a platinum wire (see Figu
22、re 1 as an example). ? EN 14210:2003 (E) 5 Dimensions in millimetres Figure 1 Stirrup for measuring interfacial tension NOTEThe stirrup specified in EN 14370 for measuring the surface tension is identical with that one shown in Figure 1, except for the lengths of the measuring wire and the branches.
23、 3.3 Ring The ring shall consist of a platinum or platinum/iridium wire with a thickness less than or equal to 0,4 mm and a mean circumference of 60 mm. By means of a wire stirrup, it shall be attached in a horizontal position to a metal rod forming the link to the tensiometer (see Figure 2 as an ex
24、ample). ? EN 14210:2003 (E) 6 Dimensions in millimetres Key 1Metal rod 2Wire loop 3Ring Figure 2 Ring for measuring interfacial tension NOTEThe ring specified in EN 14370 for measuring the surface tension is identical with that one shown in Figure 2. 3.4 Sample vessel The sample vessel for the liqui
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