Abstract
Abstract The geochemistry and distribution of Cu, Cr, Zn, Pb, Ni, Co, V and As were investigated in bottom and suspended sediment in the St. Marys River, Ontario/Michigan. Elevated concentrations, above background, of Fe, Mg, Ca, Mn, Pb, Zn, and As in suspended and bottom sediments were observed at the Canadian shore in the vicinity of the Algoma Steel slag dump. A further increase in the concentrations of these elements, particularly in the bottom sediment, existed near the Algoma Steel slip. In this area, the concentrations of Pb, Zn and As in bottom sediments (1865, 4600 and 92 µg/g, respectively) were many times greater than in the other sections of the river. However, the concentrations of Cr, Cu and Ni in suspended and bottom sediment increased at several locations along the St. Marys River indicating several different sources of these trace elements. The maximum concentrations of Cr, Cu and Ni in the bottom sediments were 1004, 102 and 53 µg/g, respectively. Generally, the concentrations of trace elements were considerably lower in the suspended sediments than in the bottom sediments. Concentration profiles of Cr, Zn and Pb and dating of sediment cores for Lake George in the lower St. Marys River system showed that metal contamination peaked between 1957 and 1965.
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