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We investigated the dissipation of 27 pesticides in five Japanese soils at three temperatures and the variability of activation energies ( E  a ). The dissipation of total pesticides extracted sequentially using water and acetone was fitted to a single first-order (SFO) model. The E  a values calculated from the dissipation rate constants of the SFO model showed a normal distribution with a median of 61.1 kJ mol -1 . The dissipation of water-extractable pesticides ( i.e. , phytoavailable pesticides) was fitted to a double first-order in parallel model with two dissipation rate constants: k  1 and k  2 . The E  a values calculated from k  1 and k  2 showed normal or lognormal distribution, and the medians of the normal distribution calculated from k  1 and k  2 were 62.8 and 45.2 kJ mol -1 , respectively. Furthermore, the method for estimating the biphasic dissipation of phytoavailable pesticides at different temperatures by using the median E  a values of the laboratory experiment was demonstrated in a field experiment.

Effects of temperature on the dissipation of total- and water-extractable pesticides in Japanese soils