ISOTOPIC EVALUATION OF Pb OCCURRENCES IN THE RIVERINE ECOSYSTEMS OF THE KANKAKEE WATERSHED, ILLINOIS-INDIANA

摘要

Environmental background levels of Pb were mes- sured in ponds, river waters, sediments, suspended sediments, rocks, and air particulates within Kankakee watershed during the period of 1995 to 199. Stable isotopic Pb distinguished air- borne Pb and its incorporation into riverine wetland sediments from geogenic Pb measured in river sediments. The provenance of the naturally-occurring Pb is from carbonate bedrock and con- tributes comparable concentrations in riverbank sediments(25.9- 30.4 mg kg~-1)as Pb found in wetland sediments(18.6-24.8 mg kg~-1).