NTERNATIONAL STANDARD (tso 1063 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ·MEKIYHAPOIHAH OPFAHM3AIIM HIO CTAHIAPTW3ALIИM·ORGANISATION INTERNATIONALE DE NORMALISATION Surface active agents - Determination of stability in hard water Agents de surface -- Deétermination de la stabilité a I'eau dure First edition -- 1974-12-15 ANsl Internat Doc Suct DEC 1 8 1974 1SO 1063-1974 (E) UDC 661.185 Ref. No. ISO 1063-1974 (E) Descriptors : surfactants, chemical tests, stability, hardness of water. Price based on 3 pages Copyright International Organization for Standardization Not for Resale FOREWORD ISO (the Internationat Organization 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 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 Councit. Internationat Standard ISO 1063 was drawn up by Technical Committee ISO/TC 91, Surface active agents. It was submitted directly to the ISO Council, in accordance with clause 6.12.1 of the Directives for the technical work of IsO. This International Standard cancels and replaces ISO Recommendation R 1063-1969, which had been approved by the Member Bodies of the foltowing countries : Austria Hungary Portugal Belgium India Romania Canada Iran Spain Chile Israel South Africa, Rep. of Czechoslovakia Japan Sweden Egypt, Arab Rep. of Korea, Rep. of Switzerland France Netherlands Turkey Germany New Zealand United Kingdom Poland Greece Yugoslavia No Member Body had expressed disapproval of the Recommendation. @ International Organization for Standardization, 1974 Printed in Switzerland Copyright International Organization for Standardization Not for Resale IS0 1063-1974 (E) INTERNATIONAL STANDARD Surface active agents -- Determination of stability in hard water 0 INTRODUCTION 4 PRINCIPLE Mixing of a solution of the surface active agent in differing Aknowiedge of the stability of surface active agents in hard concentrations with hard water solutions of differing water is of great importance for all the applications of these known calcium hardness. substances, since the precipitates obtained with hard water can reduce their effectiveness in practice. After leaving the solutions to stand in specified conditions, observation of their appearance, i.e. clearness, opalescence, Systematic investigations have shown that, in many tests, there is no essential difference between calcium hardness cloudiness or precipitation and magnesium hardness, so that these tests are carried out with an aqueous solution of calcium chloride of known hardness. 5 REAGENTS If, in certain cases, it is necessary to use other ions that give The reagents shali be of recognized, analytical quality. rise to hardness in water, this fact shall be mentioned in the Distilied water or water of at least equivalent purity shall be test report. used. 1 SCOPE AND FIELD OF APPLICATION 5.1 Hard water solutions, prepared according to SO 2174. This International Standard specifies a method for assessing the stability in hard water of surface active agents which are Solution St, of calcium hardness 6 meq of readily soluble at ambient temperature or slightiy higher calcium(Il) ions per litre. temperatures. Solution S2, of calcium hardness 9meq of This method is applicable to surface active agents soluble in calcium(Il) ions per litre. water at 2o°c. It can be extended to those which are Solution S3, of calcium hardness 12 meq of soluble at approximately 50 °c. calcium(1l) ions per litre. 2 REFERENCES Graduated pipettes (excluding blow