Methiozolin is new herbicide. It controls annual blueglass (poa annua) in various cool-and warm-season turfgrasses. The objective of this study was to investigate the fate of the herbicide, Methiozolin, under aerobic aquatic conditions in sediment-water system. According to the OECD and EPA registration guidelines for aerobic fate, flow-through system was prepared with saturated two sediments (fine texture and coarse texture). Extracts from water and sediment, ethylene glycol for volatile, 0.1N sodium hydroxide for 14CO2 and bound (unextractable) 14C-residues were quantified using liquid scintillation counter (LSC) and sample oxidizer, and furthermore characterized. No major metabolite (=10% of applied 14C) was observed in this system, whereas at least eight minor metabolites were observed at the water and sediment phase. Aerobic degradation occurred in two sediment systems, the volatile compound was observed up to 0.5% and 14CO2 was observed up to 23% during the study. And the time observed for half-life calculated by pseudo-first-order kinetics was approximately 54 days in total water-sediment system. More than 50% of the applied 14C was incorporated into sediment-bound residue.

Aerobic metabolism of methiozolin in aquatic sediment system

248th National Meeting (2014)

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