Effects of Temperature on the Dissipation of Total- and Water-Extractable Pesticides in Japanese Soils
Nippon Nōyaku Gakkaishi(2020)
摘要
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 firstorder 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.
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关键词
activation energy,biphasic model,dissipation,pesticides,soil,temperature
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