Effect of Time-Dependent Sorption on the Dissipation of Water-Extractable Pesticides in Soils

详细信息    查看全文

• 作者：Yutaka Motoki ; Takashi Iwafune ; Nobuyasu Seike ; Keiya Inao ; Takashi Otani
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：64
• 期：22
• 页码：4478-4486
• 全文大小：469K
• 年卷期：0
• ISSN：1520-5118

文摘

The dissipation behavior of water-extractable pesticides in soils is important when assessing the phytoavailability of pesticides in soils. This process is less understood than pesticide extraction with organic solvents. To elucidate the dissipation behavior of water-extractable pesticides in soils, we conducted an incubation study using 27 pesticides and five Japanese soils. The rate of decrease of the level of pesticides in water extracts was faster in soils than that of total extracts (water extracts and acetone extracts). This suggests that time-dependent sorption contributed to the difference in the dissipation between the pesticides in water and total extracts from soils. Increased apparent sorption coefficients (K_d,app) with time were positively and significantly correlated with K_d,app values of a 0 day incubation [K_d,app(t₀)]. This empirical relationship suggests that K_d,app(t₀) values can predict the time-dependent increase in K_d,app and the dissipation of water-extractable pesticides in soils.