1、BS EN ISO2870:2009ICS 71.100.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDSurface active agents Detergents Determination ofanionic-active matterhydrolysable and non-hydrolysable underacid conditions (ISO2870:2009)This British Standardwas published under the
2、authority of the StandardsPolicy and StrategyCommittee on 31 March2009 BSI 2009ISBN 978 0 580 57872 4Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 2870:2009National forewordThis British Standard is the UK implementation of EN ISO 2870:2009. Itsupersedes BS EN ISO 2870:1994 whi
3、ch is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/34, Methods of test for surface active agents.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessar
4、y provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 2870February 2009ICS 71.100.40 Supersedes EN ISO 2870:1994 English VersionSurface active
5、agents - Detergents - Determination of anionic-active matter hydrolysable and non-hydrolysable under acidconditions (ISO 2870:2009)Agents de surface - Dtergents - Dtermination de lamatire active anionique hydrolysable et non hydrolysableen milieu acide (ISO 2870:2009)Grenzflchenaktive Stoffe - Wasch
6、mittel - Bestimmung vonsauer hydrolysierbaren und nicht-hydrolysierbarenanionaktiven Anteilen (ISO 2870:2009)This European Standard was approved by CEN on 28 January 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
7、Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, Fre
8、nch, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, C
9、zech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROP
10、EN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 2870:2009: EBS EN ISO 2870:2009EN ISO 2870:2009 (E) 3 Foreword This docume
11、nt (EN ISO 2870:2009) has been prepared by Technical Committee CEN/TC 276 “Surface active agents“, the secretariat of which is held by AFNOR, in collaboration with Technical Committee ISO/TC 91 “Surface active agents“. This European Standard shall be given the status of a national standard, either b
12、y publication of an identical text or by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CEN
13、ELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 2870:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belg
14、ium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN ISO 2870:200
15、9ISO 2870:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents 2 5 Apparatus 2 6 Sampling 2 7 Procedure 2 7.1 Test portion and test solution . 2 7.2 Determination of total anionic-active matter . 3 7.3 Determination of hyd
16、rolyzable anionic-active matter . 3 8 Calculation and expression of results 3 8.1 Calculations. 3 8.2 Precision 4 9 Test report . 4 Bibliography . 5 BS EN ISO 2870:2009ISO 2870:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide fed
17、eration of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that comm
18、ittee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accorda
19、nce with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires
20、 approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2870 was prepared by the European
21、 Committee for Standardization (CEN) Technical Committee CEN/TC 276, Surface active agents, in collaboration with Technical Committee ISO/TC 91, Surface active agents, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). This third edition cancels and rep
22、laces the second edition (ISO 2870:1986) which has been technically revised. The following major change was introduced: introduction of the potentiometric two-phase titration. BS EN ISO 2870:2009INTERNATIONAL STANDARD ISO 2870:2009(E) ISO 2009 All rights reserved 1Surface active agents Detergents De
23、termination of anionic-active matter hydrolysable and non-hydrolysable under acid conditions 1 Scope This International Standard specifies a method for the determination, in detergents, of anionic-active matter hydrolyzable and non-hydrolyzable under acid conditions. This active matter includes alky
24、l sulfates and hydroxysulfates and alkylphenol and fatty alcohol ethoxysulfates. The mean relative molecular mass of the two types of active matter must be known or previously determined, if their content is expressed as a percentage by mass. If the detergent contains any oxidizing agent, this must
25、be destroyed before the hydrolysis. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
26、 applies. ISO 607, Surface active agents and detergents Methods of sample division ISO 2271, Surface active agents Detergents Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure ISO 3696, Water for analytical laboratory use Specification and test metho
27、ds EN 14480, Surface active agents Determination of anionic surface active agents Potentiometric two-phase titration method 3 Principle Titration of an aliquot of a sample solution with benzethonium chloride solution according to the direct two-phase titration procedure specified in ISO 2271 or the
28、potentiometric two-phase titration specified in EN 14480. Hydrolysis, by refluxing under acidic conditions, of a second aliquot of the sample solution after destruction, if necessary, of any oxidizing agent in the sample by the addition of sodium sulfite. Titration of non-hydrolyzed anionic-active m
29、atter as before. Calculation of the contents of hydrolyzable and non-hydrolyzable anionic-active matter from the results obtained. BS EN ISO 2870:2009ISO 2870:2009(E) 2 ISO 2009 All rights reserved4 Reagents 4.1 General. WARNING The procedures described in this International Standard involve the use
30、 of hazardous materials. The necessary precautions as described in regulations covering the handling of hazardous substances should be taken. Technical, organizational and personal protection measures should be observed. During the analysis, unless otherwise specified, use only reagents of recognize
31、d analytical grade that have been checked in advance as to not interfere with the analytical results and water complying with grade 1 as defined in ISO 3696. 4.2 Sulfuric acid, c(H2SO4) = 490 g/l solution (CAS number: 7664-93-9). 4.3 Sodium sulfite, c(Na2SO3) 20 g/l solution (CAS number: 7757-83-7).
32、 4.4 Phenolphthalein, c(C20H14O4) = 10 g/l ethanolic solution (CAS number: 77-09-8). 4.5 Sodium hydroxide, c(NaOH) = 400 g/l solution (CAS number: 1310-73-2). 4.6 Sodium hydroxide, c(NaOH) = 40 g/l solution (CAS number: 1310-73-2). 4.7 Benzethonium chloride, (Hyamine 1622) standard volumetric soluti
33、on, c(C27H42CINO2.H2O) = 0,004 mol/l (CAS number: 121-54-0). In addition, the other reagents mentioned in ISO 2271 or, respectively, EN 14480 shall be used for the active matter titration. 5 Apparatus Ordinary laboratory apparatus and in addition, the other apparatus mentioned in EN 14480 shall be u
34、sed for the potentiometric active matter titration and the following: 5.1 Conical flask, of capacity 250 ml, with a conical ground glass joint. 5.2 Reflux condenser, water-cooled, with a conical ground glass joint at the bottom, fitting on to the conical flask (5.1). 6 Sampling The test sample shall
35、 be prepared and stored in accordance with ISO 607. 7 Procedure 7.1 Test portion and test solution Weigh, to the nearest 1 mg, a sample amount which contains 3 to 5 milli-equivalents of anionic-active matter, and dissolve in 30 ml of water. Transfer the solution quantitatively to a 100 ml volumetric
36、 flask and dilute to the mark (test solution A). BS EN ISO 2870:2009ISO 2870:2009(E) ISO 2009 All rights reserved 37.2 Determination of total anionic-active matter Transfer a 10 ml aliquot of the solution A to a 100 ml volumetric flask and make up to the volume with water. Take a 10 ml aliquot of th
37、is solution and carry out the determination of total anionic-active matter present in the sample visually by the procedure described in ISO 2271 or potentiometrically by the procedure described in EN 14480. 7.3 Determination of hydrolyzable anionic-active matter By means of a pipette, transfer a sec
38、ond aliquot of 10 ml of the solution A (7.1) to the conical flask (5.1). Add, by means of a pipette, 5 ml of the sulfuric acid solution (4.2) and a few anti-bumping granules. If the sample contains oxidizing agents, add also 10 ml of the sodium sulfite solution (4.3). Attach the water-cooled reflux
39、condenser (5.2), well washed with water, to the conical flask and reflux for 3 h. Apply heat cautiously at the start to avoid excessive foaming. At the end of the reflux period of 3 h, allow to cool, wash down the water-cooled reflux condenser with at least 5 ml of water, detach the conical flask an
40、d wash the ground glass joint with a little water, collecting the washings in the conical flask. Add a few drops of the phenolphthalein solution (4.4) and neutralize with the sodium hydroxide solution (4.5); add most of the sodium hydroxide solution at once and then complete the neutralization drop
41、wise with the sodium hydroxide solution (4.6) until the solution turns pink. Quantitatively transfer the content of the conical flask to a 100 ml volumetric flask and dilute to the mark with water. Take a 10 ml aliquot of this solution and carry out the determination of non-hydrolyzed anionic active
42、 matter present in the sample visually by the procedure described in ISO 2271 or potentiometrically by the procedure described in EN 14480. 8 Calculation and expression of results 8.1 Calculations 8.1.1 Anionic-active matter The content of total anionic active matter c1, expressed as mmol/100 g, is
43、given by Equation (1): 11100 100Vccm= (1) where m is the mass, in grams, of the test portion; c is the actual concentration, expressed in moles per litre, of the benzethonium chloride solution (4.7); V1is the volume, in millilitres, of the benzethonium chloride solution (4.7) used for the titration
44、of total anionic-active matter. BS EN ISO 2870:2009ISO 2870:2009(E) 4 ISO 2009 All rights reserved8.1.2 Anionic-active matter non-hydrolyzable under acid conditions The content of non-hydrolyzable anionic active matter c2, expressed as mmol/100 g, is given by Equation (2): 22100 100Vccm= (2) where m
45、 is the mass, in grams, of the test portion; c is the actual concentration, expressed in moles per litre, of the benzethonium chloride solution (4.7); V2is the volume, in millilitres, of the benzethonium chloride solution (4.7) used for the titration of anionic-active matter after acid hydrolysis. 8
46、.1.3 Anionic-active matter hydrolyzable under acid conditions The content of hydrolyzable anionic active matter c3, expressed as mmol/100 g, is given by Equation (3): 312ccc= (3) 8.2 Precision 8.2.1 Repeatability limit The difference found between the results of two determinations carried out on the
47、 same sample simultaneously or in rapid succession by the same analyst using the same apparatus should not exceed 2 % of the mean value. 8.2.2 Reproducibility limit The difference between the results obtained on the same sample in two different laboratories should not exceed 4 % of the average value
48、. 9 Test report The test report shall include the following information: a) all information necessary for the identification of the sample tested; b) a reference to this International Standard (ISO 2870); c) the test results; d) details of any operation not specified in this International Standard o
49、r in the standards to which reference is made, and any operations regarded as optional, as well as any incidents like to have affected the results. BS EN ISO 2870:2009ISO 2870:2009(E) ISO 2009 All rights reserved 5Bibliography 1 REID, V.W. et al., Tenside 5, 1968, pp. 90-96 BS EN ISO2870:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsible for preparing Br
