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Anaerobic Degradation of Atrazine and Metolachlor and Metabolite Formation in Wetland Soil and Water Microcosms

^a USDA-NRCS, Oregon State Univ., ALS Bldg., Rm. 3017, Corvallis, OR 97331
^b Agric. Res. Stn., P.O. Box 9061, Virginia State Univ., Petersburg, VA 23806

View larger version (19K): [in a new window]   Fig. 1. The oxidation–reduction potential (Eh) and soil pH of a tidal wetland soil incubated at 24°C in the laboratory for 112 d.

View larger version (18K): [in a new window]   Fig. 2. Dissipation of atrazine and metolachlor in (a) anaerobic soil and (b) water above the soil over 112 d of incubation at 24°C.

View larger version (33K): [in a new window]   Fig. 3. Metabolite concentrations of (a) atrazine in water above the soil, (b) atrazine in anaerobic soil, (c) metolachlor in water above the soil, and (d) metolachlor in anaerobic soil. Concentrations were monitored over 112 d, while microcosms were incubated at 24°C.