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Toxic chemicals and trace metals from urban and rural louisiana lakes: recent historical profiles and toxicological significance.

Sediment cores collected from lakes in rural and urban/industrial areas of Louisiana were dated using 137 Cs, sectioned, and analyzed for a wide range of pollutant chemicals deposited during the period 1950-1991. Mutagenicity testing also was performed on extracts from the core sections. Statistical and other comparisons of chemical data indicated that annual loadings of polycyclic aromatic hydrocarbons, chlorinated chemicals, and trace metals were not significantly different in the urban lake vs the rural lake over the historical period compared. Mutagenic activity was detected in both lakes, primarily in sediments deposited between 1955 and 1980, with minimal activity before and after that period. This was a time of widespread industrial and agricultural activity in Louisiana, before restrictions on chemical releases to the environment were instituted and enforced.