BEHAVIOR OF FLUORINE CONTAINED SURFACE ACTIVE AGENTS IN NATURAL WATERS

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Analytical methods of perfluorooctanoic acid (PFOA) in waters were developed using by gaschromatograph (ECD) (HP-5890 II) and ionchromatograph (Dionex DX-AQ).Behavior of PFOA in natural waters :1) Biodegradation rates of PFOA in aerobic and anaerobic natural waters at 30ﾟC were determined. After about fifty days no degradation of PFOA was observed in both conditions.2) Uptakes of PFOA from waters to montmorillonite, artificial soil and Suwa-lake sediments were determined. As the results of this expriments, the uptake is not seemed to be adsorption to the solid phase, and only partitioning of PFOA between solid phase and water. Organic carbon is not the key of the uptake of PFOA from water to solid phase.Ecotoxicity tests : Ecotoxicity tests of PFOA by Selenastrum capricornutum, Daphnia magna, Oryzias latipes and Paratya compressa improvisa were carried out at the National Institute for Environmental Studies. The toxicities of PFOA for these aquatic organisms are less than Irgasan (2,4,4'-trichloro-2'-hydroxy-diphenyl ether), which is imported, widely used as a disinfectant, and determined in the effluents of sewage treatment plants.As a result of this study, we propose the necessity of the complete disclosure and warning about the toxicities and risks of chemicals to citizen as well as the regulation of chemicals by the Goverment.