Abstract
The speciation of arsenic in the environment is controlled by reduction, methylation, and oxidation processes and is therefore influenced by redox conditions. However, in the lakes studied, speciation was found to be far from thermodynamic equilibrium. A Superfund site is a major source of As to the watershed, with the Aberjona River being the main conduit for As found in the Mystic Lakes. Total As concentrations in the water column decrease downstream, from >100 nM in the Hall's Brook Storage Area (HBSA), where As(III) enters via reducing ground-water, to <20 nM in the Lower Mystic Lake (LML); the sediments of all the lakes are sinks for As.
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