Abstract

The concentrations of some heavy metals in lake sediments from the Sudbury-Temagami area were determined by radiochemical neutron activation, atomic absorption, and x-ray fluorescence. Data for dredge samples from 23 lakes indicate that concentration gradients for Pd, As, and Se tend to center about the Sudbury industrial complex and increase toward it. Metal concentration profiles over the top 20 cm of sediment cores from five lakes show pronounced increases in Pd, Ir, Au, As, Se, Cu, Ni, and Pb in the top 5 cm. These data suggest that one of the principal pathways for heavy metal loading of lake sediment in the area is atmospheric fallout of particulate material.

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