Temporal and Spatial Trends of Organochlorine Pesticides in Great Lakes Precipitation

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• 作者：Ping Sun ; Sean Backus ; Pierrette Blanchard ; and Ronald A. Hites
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：April 1, 2006
• 年：2006
• 卷：40
• 期：7
• 页码：2135 - 2141
• 全文大小：492K
• 年卷期：v.40,no.7(April 1, 2006)
• ISSN：1520-5851

文摘

Organochlorine pesticide concentrations in precipitationsamples collected from 1997 to 2003 at seven IntegratedAtmospheric Deposition Network sites around the Great Lakesare reported. The 28-day volume weighted mean concentrations of several pesticides, including mages/gifchars/gamma.gif" BORDER=0 >-hexachlorocyclohexane (HCH), endosulfan, hexachlorobenzene, chlordane,and DDE, showed significant seasonal trends. For current-use pesticides (endosulfan and mages/gifchars/gamma.gif" BORDER=0 >-HCH), their concentrationspeaked in late spring to summer just after their agriculturalapplication. For the banned pesticides, higher concentrations were observed in the winter due to their enhancedpartitioning to particles and scavenging by snow. Long-termdecreasing trends were observed for several pesticidessuch as mages/gifchars/gamma.gif" BORDER=0 >-HCH and DDE. On the other hand, mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-HCH showedsignificant increasing concentrations as a function oftime at Brule River, Eagle Harbor, and Sleeping Bear Dunes.Generally, Chicago had the highest concentration ofchlordanes, dieldrin, and DDT, indicating that urban areascould be a source for these compounds to precipitation.For mages/gifchars/gamma.gif" BORDER=0 >-HCH and endosulfans, Point Petre had the highestconcentrations due to the application of these pesticidesin the surrounding areas.