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1、INTERNATIONAL STANDARD 4315 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MExlMMPoflHAR OPrAHH3AUMfl no CTAHLIAPTA3AUAW.ORGANISATION INTERNATIONALE DE NORMALSATON Surface active agents - Determination of alkalinity - Titrimetric method Agents de surface - De termination de l alcalinite - Me thode
2、titrime trique First edition - 1977-02-01 Gi UDC 661.185 : 543.241 Ref. No. IS0 4315-1977 (E) I= cn 2 Descriptors : surfactants, chemical analysis, determination of content, alkalinity, volumetric analysis. 5 Price based on 2 pages Copyright International Organization for Standardization Provided by
3、 IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 21:45:23 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards i
4、nstitutes (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, gov
5、ernmental 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 as International Standards by the IS0 Council. international Standard IS0 4315 w
6、as drawnup by Technical Committee ISO/TC 91, Surface active agents, and was circulated to the member bodies in August 1975. It has been approved by the member bodies of the following countries : Australia Austria Belgium Brazil Canada Egypt, Arab Rep. of France Germany Hungary India Iran Italy Japan
7、 Netherlands New Zealand Poland Portugal Romania No member body expressed disapproval of the document. South Africa, Rep. of Spain Switzerland Thailand Turkey United Kingdom U.S.A. U.S.S.R. Yugoslavia 0 International Organization for Standardization, 1977 l Printed in Switzerland Copyright Internati
8、onal Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 21:45:23 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 4315-1977 (E) Surface active agents - D
9、etermination of alkalinity - Titrimetric method 0 INTRODUCTION 5 APPARATUS 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. Ordinary laboratory apparatus
10、, and in particular : 5.1 Conical flask, capacity 250 ml, complying with the requirements of IS0 1773. The method specified in this International Standard is based on the determination of the alkalis in the form of carbonates, bicarbonates, alkali hydroxides or free organic bases such as triethanola
11、mine. 5.2 Burette, capacity 10 ml, complying with the require- ments of class A of IS0 385. 6 SAMPLING 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 applicable on
12、ly if so indicated in the specific standard for each product; in particular it is not suitable for products containing soaps. 2 REFERENCE IS0 607, Surface active agents - Detergents - Methods of sample division. 1) 3 PRINCIPLE Titration of a clear solution of the surface active agent with a standard
13、 volumetric hydrochloric acid solution, in the presence of methyl orange or bromophenol blue as as indicator. 4 REAGENTS During the analysis, use only reagents of recognized analyti- cal grade and only distilled water or water of equivalent purity. 4.1 Hydrochloric acid, 0,l N standard volumetric so
14、lution. 4.2 Methyl orange or bromophenol blue, 1 g/l solution. The laboratory sample of the surface active agent shall be prepared and stored according to the instructions given in IS0 607. 7 PROCEDURE 7.1 Test portion Weigh, to the nearest 0,001 g, about 5 g of the laboratory sample into the conica
15、l flask (5.1). 7.2 Determination Add 50 ml of water to the test portion (7.1) and dissolve or homogenize if necessary. Then add 2 drops of the indicator solution (4.2) and titrate with the hydrochloric acid solution (4.1) until the end-point is reached. NOTE - To facilitate the colour comparison, pr
16、epare by the same procedure a solution of about 5 9 of the laboratory sample in 50 ml of water and add 2 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*O), is given by the formula vx Tx3,l where m V
17、is the volume, in millilitres, of the standard volu- metric hydrochloric acid solution (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. 1) In preparation. (Revision of ISO/R 607.) 1 Copyright Internat
18、ional Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 21:45:23 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4315-1977 (El 9 TEST REPORT c) the results obtained and the f
19、orm in which they are expressed; The test report shall include the following particulars : d) the test conditions; a) all information necessary for the complete identi- fication of the sample; e) any operation not included in this International Standard or regarded as optional, as well as any incide
20、nts b) the reference of the method used; which may have affected the results. ” ,: 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 21:45:23 MDTNo reproduction or networking permitted without license from IHS -,-,-