Abstract
We present and discuss the chemical speciation of dissolved Pb (Pba) in the water column of a small kettle lake located in the Michigan upper peninsula; Paul Lake. This lake offers a semi-permanent oxic/ anoxic transition in the water column because its morphology, small surface area, and sheltering from dominant winds are conducive to the establishment of a biogenic meromixis. A more complete description of the lake can be found in Lienemann et al. (1997) where we have shown that, at the oxic/anoxic transition, Co is scavenged by the formation of MnOx at the surface of manganese oxidizing bacteria. Here, we detail the speciation of Pbd using a multi-method approach to characterize the various chemical forms under which lead is present.
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