河川水および海水中における殺菌剤イソプロチオランの残存

抄録

Persistence of isoprothiolane, diisopropyl 1, 3-dithiolan-2-ylidenemalonate (Fuji one ^®), in river water and sea water was investigated. Isoprothiolane in water samples was quantitated and identified by a gas chromatograph equipped with an electron capture detector and a gas chromatographic-mass spectrometric technique.
Isoprothiolane residues at Chikugo river and Ariake sea sites were detected throughout the year. The maximum concentration was observed in August when it has been applied to paddy fields. After that, the concentrations reduced by degrees. However, the low levels were found in waters in January and March 1981. The detection of the chemical in this period may suggest that the appleed chemical has combined with soil surface in paddy fields and flown out gradually from these fields. The levels of isoprothiolane ranged from 0.001 to 4.2 μg/l in Ariake sea and from 0.001 to 224 μg /l in rivers and agricultural drainage.