Settling times, phytoplankton

When trace elements are introduced into a lake by riverine and atmospheric input, they interact (1) with solutes (complex formation) and (2) with inorganic and organic (phytoplankton) particles (adsorption and assimilation). The affinity of the reactive elements for the particles, which settle through the water column, determines essentially the relative residence time of these elements and their residual concentrations and ultimate fate (Figure 10.20). 

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