(ISo 6387 International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPrAHV3AWS HIO CTAHAAPTW3AWW-ORGANISATION INTE RNATIONALE DE NORMALISATION KrsT Tylxmct D Sect Surface active agents - Determination of the power to disperse calcium soap -- Acidimetric method (Modified Schonfeldt method) Deétermination du pouvoir dispersant vis-a-vis du savon calcique -- Methode acidimetrique (Methode de Agentsdesurface- Schonfeldt modifiee) First edition - 1983-02-01 UDC 661.185 : 620.1 :541.182.02 Ref. No. .1SO 6387-1983 (E) Descriptors : surfactants, tests, determination, suspensions, soaps, acidimetric analysis. Price based on 3 pages Copyright International Organization for Standardization Notfor Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (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 authorized has 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 as International Standards by the Iso Council. International Standard ISO 6387 was developed by Technical Committee ISO/TC 91, Surface active agents, and was circulated to the member bodies in April 1982. It has been approved by the member bodies of the following countries : Australia Germany, F.R. Netherlands Hungary Austria Poland Belgium iran Romania China Ireland South Africa, Rep. of Czechoslovakia Japan Spain Egypt, Arab Rep. of Korea, Rep. of Switzerland Mexico USSR France No member body expressed disapproval of the document. International Organization for Standardization, 1983 Printed in Switzerland Copyright International Organization for Standardization e from IHS Not for Resale INTERNATIONAL STANDARD ISO/DIS6387-1983 (E) Surface active agents - Determination of the power to disperse calcium soap -- Acidimetric method (Modified Schonfeldt method) : Scope an aliquot portion of the lower layer with a standard volumetric 1 solution of hydrochloric acid in the presence of bromocresol This International Standard specifies an acidimetric method of green as indicator. test for determining the minimum quantity of dispersing agent (surface active agent) required to maintain at least 95 % of the calcium soap present in complete dispersion for one hour. Reagents During the analysis use only reagents of recognized analytical NOTE .. This method may also provide information on the amount of calcium soap partially dispersed by insufficient quantities of dispersing grade, and only distlled water or water of equivalent purity. agents (surface active agents). Water of known calcium hardness, prepared as 6.1 specified in IS0 2174. 2 Field of application 6.2 Sodium oleate, 100 g/l solution. This International Standard applies to all types of surface active agent insofar as these do not interfere during the acidimetric Weigh, to the nearest 0,001 g, 92,78 g of oleic acid and titration of calcium soaps. Alkaline inorganic salts such as dissolve it in 328,5 ml of sodium hydroxide solution, phosphates, carbonates and silicates shall not be present. c(NaOH) = 1 mol/l. Allow to cool to ambient temperature. Transfer quantitatively the solution to a 1 000 ml one-mark volumetric flask and make up to the volume with water. Reference 6.3 Hydrochloric acid, standard volumetric solution, Iso 2174, Surface active agents - Preparation of water with c(HCI) = 0,01 mol/1. known calcium hardness. 6.4 Bromocresol green (C21H14Br40gS), 1 g/I solution. Dissolve 0,25 g of bis-3,3 (2-methyl-3,5 dibromo 4 hydroxy 4 Definition phenyl)-2,1 benzoxathiol-1,1 dioxide in 57,2 m! of sodium hydroxide solution, c(NaOH) = 0,01 mo