Clothianidin Decomposition in Missouri Wetland Soils.

Clothianidin (CTN), a commonly used neonicotinoid pesticide, is mobile in soil resulting in a high leaching potential into surface, ground and soil pore waters. However, CTN can also persist in soil for multiple years. The presence of clothianidin and other neonicotinoids in the environment has potential to effect ecosystem functions and non-target taxa. The objective of this study is to investigate the effect of oxic and anoxic soil conditions on the half-life of CTN in Missouri wetland soils. Five wetland soils will be incubated under oxic and anoxic conditions for 60 days to examine the effect on CTN decomposition. Clothianidin decomposition will be quantified using high performance liquid chromatography (HPLC). Sorption experiments will be performed to determine the solid-to-solution partition coefficient (K_d) values for CTN reacted with wetland soils. Ultimately, the goal of this study is to elucidate the effect of an extended wetland hydroperiod on CTN decomposition in wetlands managed by Missouri Department of Conservation (MDC).The results of this study will influence wetland management decisions which could help to mitigate negative impacts associated with CTN. Clothianidin soil half-life values will contribute to existing knowledge and potentially provide clarification to factors contributing to CTN half-life variability.