Recently in Japan, pesticides have been detected in crops exceeding the uniform residue limit set by the Japanese Positive List System. One of the reasons is that crops take up residual pesticides from soil resulting from previous applications. Some of the pesticides adsorbed to soil particles were eluted to soil water and taken up by plants via roots. Hence, estimation of the amount of water�extractable pesticides in soils is important to predict the amount of crop pesticide residues. In this study, about 20 pesticides were added to five Japanese soils. The test tubes were incubated in the dark at 25 � 2 �C for 0, 2, 7, 14, 30, 60 and 120 days. After each incubation period soil samples were successively extracted with water and acetone. The water�extractability of pesticide residues in soils was not constant but decreased during the aging process. The degree of decline of the water�extractability increased with increasing soil organic carbon content.

Effect of aging time on water�extractability of pesticide residues in Japanese soils

248th National Meeting (2014)

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