In this book, the proceedings of the Third European Symposium on "Analysis of Organic Micropollutants in Water", held in Oslo (Norway), from 19 to 21 September 1983, are presented. The symposium was organized within the framework of the Concerted Ac­ tion COST 64b bis *, which has the same name and is included in the Third R&D, Programme on Environment of the Commission of the European Communi­ ties - Indirect and Concerted Actions - 1981 to 1985. The aim of the symposium was to review the progress and results achiev­ ed during the past two years, since the Second symposium, held in Killarney (Ireland) in November 1981. The programme of the symposium consisted of review papers covering dif­ ferent areas related to the analysis of the organic pollutants in water, in­ cluding sampling and sample treatment, gas and liquid chromatography, mass spectrometry and specific analytical problems for some types of compounds. We think that the volume gives a rather complete overview of these activities in Europe. Moreover, the paper presented by D. Hunt reviews the development of the new technique mass spectrometry - mass spectrometry in the United States of America. Some special sessions concerned the presentation of original contri­ butions in form of poster, the extended versions of which are published in this volume.