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Sorption and Degradation Characteristics of Phosmet in Two Contrasting Australian Soils

School of Resource Management, The University of Melbourne, Victoria 3010, Australia

View larger version (9K): [in a new window]   Fig. 1. Phosmet chemical structure.

View larger version (14K): [in a new window]   Fig. 2. Phosmet sorption isotherms for the Ferrosol (0–3 mg L-1) at depths of 0 to 0.05 m (), 0.05 to 0.1 m (), 0.1 to 0.2 m (), and 0.2 to 0.3 m (•), with fitted Freundlich isotherms (0.05–0.1, 0.1–0.2, 0.2–0.3 m) and a fitted linear isotherm (0–0.05 m) (——).

View larger version (14K): [in a new window]   Fig. 3. Phosmet sorption and desorption isotherms for the Podosol (0–7 mg L-1) at depths of 0 to 0.05 m (ads: , des: ); 0.05 to 0.1 m (ads: , des: ); 0.1 to 0.2 m (ads: , des: ); and 0.2 to 0.3 m (ads: •, des: ); with fitted Freundlich isotherms for sorption (——) and desorption (——).

View larger version (16K): [in a new window]   Fig. 4. Phosmet degradation in the Ferrosol at depths of 0 to 0.05 m (), 0.05 to 0.1 m (), 0.1 to 0.2 m (), and 0.2 to 0.3 m (•).

View larger version (14K): [in a new window]   Fig. 5. Phosmet degradation in the Podosol at depths of 0 to 0.05 m (), 0.05 to 0.1 m (), and 0.1 to 0.2 m ().