1、BRITISH STANDARD BS EN ISO 4320:1998 Non-ionic surface active agents Determination of cloud point index Volumetric method (ISO 4320:1977, including Erratum:1980) The European Standard EN ISO 4320:1997 has the status of a British Standard ICS 71.100.40BSENISO4320:1998 This British Standard, having be
2、en prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 March 1998 BSI 04-1999 ISBN 0 580 29123 5 National foreword This British Standard is the English language version of EN ISO4320:1997. Itis
3、derived from ISO4320:1977, incorporating Erratum:1980. It supersedes BS6829-4.4:1989 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CII/34, Methods of test for surface active agents, which has the responsibility to: aid enquirers to understand the te
4、xt; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committe
5、e can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement
6、 these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the neces
7、sary 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN
8、ISO title page, page 2, the ISO title page, page ii, pages 1 and 2 and aback 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. Amendments issued since publication Amd. No. Date
9、 CommentsBSENISO4320:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword ii Text of EN ISO 4320 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4320 May 1997 ICS 71.100.40 Descriptors: See ISO document English version Non-ionic surface active a
10、gents Determination of cloudpoint index Volumetric method (ISO 4320:1977, Including Erratum:1980) Agents de surface non ioniques Dtermination de lindice de trouble Mthodevolumtrique (ISO 4320:1977, Erratum:1980 inclus) Nichtionische Tenside Bestimmung der Trbungstitrationszahl Volumetrisches Verfahr
11、en (ISO 4320:1977, einschlielich Erratum:1980) This European Standard was approved by CEN on 1997-04-06. 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
12、. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation
13、under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Neth
14、erlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means
15、 reserved worldwide for CENnational Members. Ref. No. EN ISO 4320:1997 EENISO4320:1997 BSI 04-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC 91 “Surface active agents” of the International Organization for Standardization (ISO) has been taken over as an Europe
16、an Standard 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 month of November 1997, and confli
17、cting national standards shall be withdrawn at the latest by November 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, I
18、celand, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO4320:1977, Including Erratum: 1980 has been approved by CEN as a European Standard without any modification. Contents Pag
19、e Foreword 2 0 Introduction 1 1 Scope 1 2 Field of application 1 3 Reference 1 4 Definition 1 5 Principle 1 6 Reagents 1 7 Apparatus 1 8 Sampling 1 9 Procedure 2 10 Expression of results 2 11 Test report 2 Figure Double-walled breaker 1ENISO4320:1997 ii BSI 04-1999 Foreword ISO (the International Or
20、ganization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up ha
21、s the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance
22、 as International Standards by the ISO Council. International Standard ISO 4320 was drawn up by Technical Committee ISO/TC91, Surface active agents, and was circulated to the member bodies in October 1975. It has been approved by the member bodies of the following countries: No member body expressed
23、 disapproval of the document. Descriptors: Surfactants, non-ionic surfactants, tests, determination, cloud point, volumetric analysis. Austria Belgium Brazil Canada France Germany Hungary India Iran Italy Japan Korea, Dem. P. Rep. of Mexico Netherlands New Zealand Poland Portugal Romania South Afric
24、a, Rep. of Spain Switzerland Turkey United Kingdom U.S.A.ENISO4320:1997 BSI 04-1999 1 0 Introduction Determination of the cloud point index provides a way of characterizing weakly alkoxylated derivatives and their hydrocarbon hydrophobic groups. This simple and rapid measurement is a valuable means
25、for checking the level of alkoxylation of non-ionic derivatives intended, for example, for sulphonation. 1 Scope This International Standard specifies a volumetric method for the determination of the cloud point index of non-ionic surface active agents. 2 Field of application The method is applicabl
26、e to weakly alkoxylated non-ionic surface active agents (1 to 5 oxyethylene groups) the hydrophobic group of which is provided by an alcohol, an alkylphenol or a fatty acid (provided that the last has a melting point lower than 30C), subject to the product being soluble in propan-1-ol to the extent
27、of 1g in 10ml at 30C. It is equally applicable to lipophilic bases derived from alcohols, alkylphenols and fatty acids. 3 Reference ISO 607, Surface active agents Detergents Methods of sample division 1) . 4 Definition For the purposes of this International Standard, the following definition applies
28、: cloud point index the number of millilitres of distilled water necessary to render cloudy, at a specified temperature, a solution containing a given mass of surface active agent in a given volume of solvent 5 Principle Addition, at 30C, of distilled water to a propanol solution of the surface acti
29、ve agent until the appearance of cloudiness. 6 Reagents 6.1 Distilled water. 6.2 Propan-1-ol, complying with the following requirements: assay (by gas chromatography) 99% (m/m); density 200,804 to 0,805g/ml; refractive index 1,384 to 1,385; non-volatile matter 0,005% (m/m); free acidity (expressed a
30、sC 2 H 5 COOH)0,01% (m/m); water (determined by the Karl Fischer method; see ISO760) 0,2% (m/m). 7 Apparatus Ordinary laboratory apparatus, and in particular: 7.1 Beaker (see the figure) of height 80mm and diameter 50 mm, with double walls permitting temperature stability, and having a mass lessthan
31、200g, fitted with a polyethylene, polytetrafluoroethylene or an aluminium foil cover pierced with two holes allowing entry of the thermometer (7.2) and the burette (7.4). 7.2 Thermometer, STC/0,1/29/41, complying with the requirements of ISO/R 654. 7.3 One-mark pipette, capacity 10ml, complying with
32、 the requirements of ISO648. 7.4 Burette, capacity 50ml, complying with the requirements of class A of ISO385. 7.5 Magnetic stirrer. 7.6 Bar magnet, coated with polytetrafluoroethylene. 7.7 Water bath, with circulation, capable of being controlled to within 0,1C. 8 Sampling The laboratory sample of
33、the non-ionic surface active agent shall be prepared and stored according to the instructions in ISO607. 1) In preparation, (Revision of ISO/R 607.) Figure Double-walled beaker n 20 DENISO4320:1997 2 BSI 04-1999 9 Procedure 9.1 Test portion Weigh 1,0 0,1g of the laboratory sample into thebeaker (7.1
34、), previously weighed to the nearest0,01g. 9.2 Determination Add 10ml of the propan-1-ol (6.2) to the beaker (7.1) containing the test portion (9.1). Introduce the bar magnet (7.6), place the beaker fitted with its cover on the magnetic stirrer (7.5) and insert the thermometer (7.2). Fit the beaker
35、(7.1) onto the water bath (7.7) and control the temperature at 30,0 0,1C. Start the water circulation and the stirrer (stir gently at first in order to avoid splashing the liquid on the walls of the beaker). Ensure that the test portion is completely dissolved (the solution should be clear) and add,
36、 drop by drop, the water (6.1) from the burette (7.4) until the liquid remains cloudy. Check that the temperature in the beaker is maintained at 30,0 0,5C during the complete operation. The results of the test depend upon the speed of introduction of the water. Hence, the period during which it is i
37、ntroduced should be between 20 and30min, according to the quantity of water introduced. Immediately after the cloud point is reached, allow the solution to equilibrate for 5min so as to verify that the turbidity does not disappear. 10 Expression of results 10.1 Method of calculation The cloud point
38、index of the product is expressed as the volume, in millilitres, of water added by the procedure specified in clause9 to render opaque the solution of non-ionic surface active agent. Take as the result the mean of at least three determinations, expressed to the nearest 0,05ml (1drop of water). 10.2
39、Repeatability The maximum difference between the results of two determinations carried out in rapid succession on the same sample, by the same analyst using the same apparatus, should not exceed 2% of the mean volume found. 10.3 Reproducibility The difference between results obtained on the same sam
40、ple in two different laboratories should not exceed 5% of the mean volume found. 11 Test report The test report shall include the following particulars: a) all information necessary for the complete identification of the sample; b) the reference to the method used; c) the results obtained and the fo
41、rm in which they are expressed; d) the conditions of test: the temperature of the water bath, the temperature of the solution of the product at the moment the turbidity appears, the time taken to dissolve the product, the exact length of time during which distilled water is introduced, the length of
42、 the determination, the nature of the change from clear to cloudy, namely if the change is sharp or if there is a state of opalescence before cloudiness, the mass of the test portion; e) any operation not included in this International Standard or regarded as optional, as well as any incidents which
43、 may have affected the results.blankBS EN ISO 4320:1998 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 incorp
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