FIGURE 6.1. A highly dynamic system: biological, chemical, and physical processes cycle selenium into and out of the water and biota .
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cn.-ICaJ AM ...w.Hlei te6tc:'don
a.qUe.,.,.. «Q:6Jlllc.
... ___neaL .rtdlOI
..
FIGURE 6.2 . Processes that immobilize selenium include chemical and microbial
reduction, adsorption, coprecipitation, and deposition of plant and animal
tissue . Mobilization processes include uptake of selenium by rooted aquatic
plants and sediment oxidation due to water circulation and mixing . Additional
mobilization processes include direct uptake of selenium by benthic invertebrates and oxidation of sediments resulting from plant roots, microorganisms,
and the burrowing activity of benthos.
Co-p1t1utlorl
cn.-ICaJ AM ...w.Hlei te6tc:'don
a.qUe.,.,.. «Q:6Jlllc.
... ___neaL .rtdlOI
..
FIGURE 6.2 . Processes that immobilize selenium include chemical and microbial
reduction, adsorption, coprecipitation, and deposition of plant and animal
tissue . Mobilization processes include uptake of selenium by rooted aquatic
plants and sediment oxidation due to water circulation and mixing . Additional
mobilization processes include direct uptake of selenium by benthic invertebrates and oxidation of sediments resulting from plant roots, microorganisms,
and the burrowing activity of benthos.