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Fate of Colloidal-Particulate Elemental Selenium in Aquatic Systems

^a Department of Environmental Sciences, University of California, Riverside, CA 92521
^b Institute of Soil & Environmental Sciences, University of Agriculture, Faisalabad, Pakistan

View larger version (57K): [in a new window]   Fig. 1. Transmission electron micrograph (A) and energy dispersive spectrum (B) of colloidal Se(0) particles formed by reduction of Se(VI) in drainage water in the presence of rice straw. Arrow shows Se(0) particle.

View larger version (15K): [in a new window]   Fig. 2. A procedure to determine Se species in water samples. Particulate Se(0) = total Se – total soluble Se plus colloidal Se(0); Colloidal Se(0) = total soluble Se plus colloidal Se(0) – total soluble Se; Se(VI) = total soluble Se – Se(IV) plus organic Se; and organic Se = Se(IV) plus organic Se – Se(IV).

View larger version (40K): [in a new window]   Fig. 3. Changes in redox potentials (Eh), pH, and concentrations of Se species at 5 cm below the surface of the water in a water column and a water–sediment system during 58 d of the experiments.