Abstract
Mobility and leaching potential of Acetamiprid, (E) -N1- [ (6-chloro-3-pyridyl) methyl] -N2-cyano-N1-methylacetamidine (ATP) and its soil degradation products (degradates) in the field were investigated by the analysis of soil and water using two analytical methods. In addition to them, importance of microbial degradation of ATP in soil was evaluated by comparison of the degradation speed of ATP in sterilized and unsterilized soils.
The two different analytical methods were developed to determine the residual amounts of ATP and its soil degradates in water sample. One is a method for only ATP determination in water (P method), and another is a common moiety method for the determination of ATP and its soil degradates in water (C method) . The limit of detections (LOD) of the P method was 0.05ppb and fortified recoveries of ATP ranged from 82 to 98%. The LOD of the C method was also 0.05ppb and fortified recoveries of ATP and its soil degradates ranged from 78 to 90%.
ATP and its soil degradates were only detected in the upper part of the soil layer and they were not detected in the leachate passed through the soil layer. Only 1% of ATP applied was detected in run off water from the soil surface. Based on these results, it was estimated that leachability and run-off of ATP from soil surface was very small.
Further, it was considered that the degradation factor of ATP in soil was mainly due to microorganism.
