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Fate of Dimethyldiselenide in Soil

Department of Environmental Sciences, University of California, Riverside, CA 92521-0424

View larger version (23K): [in a new window]   Fig. 1. Solubility of dimethyldiselenide (DMDSe) in autoclaved deionized water after a 24-h incubation of DMDSe in an air–water system.

View larger version (22K): [in a new window]   Fig. 2. Sorption of dimethyldiselenide (DMDSe) in an autoclaved soil after a 24-h incubation of DMDSe in an air–soil system.

View larger version (23K): [in a new window]   Fig. 3. Formation of dimethylselenide (DMSe) along with a decrease of spiked dimethyldiselenide (DMDSe) measured in the head space samples. Dimethyldiselenide symbols (top figure): , autoclaved soil (10% moisture); , autoclaved soil (100% moisture); •, non-autoclaved soil (10% moisture); , non-autoclaved soil (100% moisture).

View larger version (33K): [in a new window]   Fig. 4. Speciation of Se in the autoclaved and non-autoclaved soils. Black bars show the control soil without adding dimethyldiselenide (DMDSe). White bars show the soil spiked with DMDSe.