ISO 9101:1987 界面活性剤—界面張力の測定—液滴体積法 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation 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 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting.

International Standard ISO 9101 was prepared by Technical Committee ISO/TC 91, Surface active agents.

Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.

0 Introduction

Interfacial tension is a fundamental property of the interface between two immiscible or partially miscible liquids. These two liquids may contain surface active agents which reduce the interfacial tension, but it is generally not possible to predict their detergent and emulsifying activities from measurements of the interfacial tension alone. .

1 Scope and field of application

This International Standard specifies a test method, by measuring the drop volume, for the determination of the interfacial tension between two liquid phases.

It is particularly suitable for the measurement of the interfacial tension between two solutions of surface active agents in aqueous or organic solvents, and provides some advantages compared with the method by drawing up liquid films (ISO 6889), which are the following:

• determination of interfacial tension between two liquid phases containing all types of surface active agents, including cationic surface active agents;
• accurate measurement of low interfacial tensions of the order of 1 mN/m;
• repeatability standard deviation less than ± 0,5 mN/m (acceptable for control in industrial laboratories);
• determination of interfacial tension of viscous liquids;
• determination of interfacial tension on only small amounts of the solution;
• time dependence of the interfacial tension can be measured using a simple automatic apparatus.

2 References

3 Definition