1、July 2009DEUTSCHE NORM English price group 7No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71.100.40!$Xll“1537373www.
2、din.deDDIN EN ISO 2870Surface active agents Detergents Determination of anionic-active matter hydrolysable andnon-hydrolysable under acid conditions (ISO 2870:2009)English version of DIN EN ISO 2870:2009-07Grenzflchenaktive Stoffe Waschmittel Bestimmung von sauer hydrolysierbaren und nicht-hydrolysi
3、erbaren anionaktiven Anteilen(ISO 2870:2009)Englische Fassung DIN EN ISO 2870:2009-07SupersedesDIN EN ISO 2870:1994-11www.beuth.deDocument comprises 10 pagesDIN EN ISO 2870:2009-07 2 National foreword This standard has been prepared by Technical Committee CEN/TC 276 “Surface active agents” (Secretar
4、iat: AFNOR, France) in collaboration with Technical Committee ISO/TC 91 “Surface active agents”. The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-05-62 AA Analytik von Tensiden. The DIN
5、Standards corresponding to the International Standards referred to in this document are as follows: ISO 607 DIN ISO 607 ISO 2271 DIN ISO 2271 ISO 3696 DIN ISO 3696 Amendments This standard differs from DIN EN ISO 2870:1994-11 as follows: a) (German version only) The introductory element in the title
6、 has been changed to read “Grenzflchen-aktive Stoffe” (formerly “Tenside”). b) Some reagents have been deleted. c) The amounts for test solution A and for the determination of the total anionic-active and the hydrolysable anionic-active matters have been modified. d) In addition to the procedure des
7、cribed in ISO 2271, the potentiometric two-phase titration method may also be used for the determination. e) The equations for the calculation of the anionic-active matter have been modified. f) The specifications relating to the repeatability limit and the reproducibility limit have been modified.
8、g) The standard has been editorially revised. Previous editions DIN EN ISO 2870: 1994-11 National Annex NA (informative) Bibliography DIN ISO 607, Surface active agents and detergents Methods of sample division DIN ISO 2271, Surface active agents Detergents Determination of anionic-active matter (di
9、rect two-phase titration procedure) DIN ISO 3696, Water for analytical laboratory use Specification and test methods EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2870 February 2009 ICS 71.100.40 Supersedes EN ISO 2870:1994English Version Surface active agents Detergents Determination of
10、anionic-active matter hydrolysable and non-hydrolysable under acid conditions (ISO 2870:2009) Agents de surface Dtergents Dtermination de la matire active anionique hydrolysable et non hydrolysable en milieu acide (ISO 2870:2009) Grenzflchenaktive Stoffe Waschmittel Bestimmung von sauer hydrolysierb
11、aren und nicht-hydrolysierbaren anionaktiven 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 Standard the status of a national sta
12、ndard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any othe
13、r 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 the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia,
14、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 STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHE
15、S KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2870:2009: EContents Page Foreword.3 1 Scope .4 2 Normative references .4 3 Principle.4 4 Reagents5
16、5 Apparatus 5 6 Sampling5 7 Procedure 5 7.1 Test portion and test solution .5 7.2 Determination of total anionic-active matter .6 7.3 Determination of hydrolyzable anionic-active matter .6 8 Calculation and expression of results6 8.1 Calculations.6 8.2 Precision7 9 Test report .7 Bibliography .8 DIN
17、 EN ISO 2870:2009-07EN ISO 2870:2009 (E)2Foreword This document (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 Standa
18、rd shall be given the status of a national standard, either by 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
19、 document may be the subject of patent rights. CEN and/or CENELEC 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
20、 are bound to implement this European Standard: Austria, Belgium, 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, S
21、weden, Switzerland and the United Kingdom. DIN EN ISO 2870:2009-07EN ISO 2870:2009 (E)31 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 alkyl sulf
22、ates 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 be des
23、troyed 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) appli
24、es. 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 methods EN
25、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 potent
26、iometric 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 matter
27、as before. Calculation of the contents of hydrolyzable and non-hydrolyzable anionic-active matter from the results obtained. DIN EN ISO 2870:2009-07EN ISO 2870:2009 (E)44 Reagents 4.1 General. WARNING The procedures described in this International Standard involve the use of hazardous materials. The
28、 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 recognized analytical grade that have
29、 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). 4.4 Phenolphthalein, c(C20H
30、14O4) = 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 solution, c(C27H42CINO2.H2O) = 0,0
31、04 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 used for the potentiometric a
32、ctive 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 be prepared and stored in a
33、ccordance 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 flask and dilute to the mar
34、k (test solution A). DIN EN ISO 2870:2009-07EN ISO 2870:2009 (E)57.2 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 this solution and carry out the determination of tot
35、al 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 second aliquot of 10 ml of the solution A (7.1) to th
36、e 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 condenser (5.2), well washed with water, to the co
37、nical 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 and wash the ground glass joint with a little water,
38、 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 wise with the sodium hydroxide solution (4.6) unti
39、l 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 matter present in the sample visually by the proc
40、edure 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 given by Equation (1): 11100 100Vccm= (1) where m
41、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 of total anionic-active matter. DIN EN ISO 2870:20
42、09-07EN ISO 2870:2009 (E)68.1.2 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 is the mass, in grams, of the test portion; c is the actual concentrati
43、on, 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. 8.1.3 Anionic-active matter hydrolyzable under acid conditions The conten
44、t 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 same sample simultaneously or in rapid succession by the same analyst u
45、sing 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. 9 Test report The test report shall include the following information:
46、 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 or 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. DIN EN ISO 2870:2009-07EN ISO 2870:2009 (E)7Bibliography 1 REID, V.W. et al., Tenside 5, 1968, pp. 90-96 DIN EN ISO 2870:2009-07EN ISO 2870:2009 (E)8
