Temporal trends of semivolatile organic contaminants in great lakes precipitation

Matt F. Simcik, Raymond M. Hoff, William M.J. Strachan, Clyde W. Sweet, Ilora Basu, Ronald A. Hites

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Precipitation was sampled around the Great Lakes as part of the Integrated Atmospheric Deposition Network (IADN) from 1991 to 1997. Many of the monthly volume weighted mean concentrations of the analytes have significantly decreased during the last 6 years with firstorder half-lives on the order of 3 ± 2 years. There was little, if any, spatial variability in the observed half-lives, suggesting similar loss processes for the various lakes and suggesting that the decrease in precipitation concentrations reflects a regional decrease in environmental levels. The first-order half- lives of organochlorine pesticide concentrations in Great Lakes precipitation were not significantly different than the corresponding atmospheric gasphase, lake water, and biota half-lives, suggesting that the entire system is at or near long-term equilibrium.

Original languageEnglish (US)
Pages (from-to)361-367
Number of pages7
JournalEnvironmental Science and Technology
Issue number3
StatePublished - Feb 1 2000


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