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Atmospheric lead deposition to Okefenokee Swamp, Georgia, USA

Environmental Pollution

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Abstract

'Capsule:' Coal combustion emissions appear to be a major source of Pb in the Okefenokee wetland. Contamination of the environment from atmospheric deposition during the twentieth century is pervasive even in areas ostensibly considered pristine or remote from point sources. In this study, Pb concentrations in a Pb-210-dated peat core collected from the Okefenokee Swamp, GA were used to assess historical contaminant input via atmospheric deposition. Lead isotope ratios were determined by dynamic reaction cell ICP-MS (DRC-ICP-MS). Increases in Pb concentration occurred in the late nineteenth century and a marked rise in Pb concentrations pre-dated the widespread use of leaded gasoline within the US. The Pb-206/Pb-207 ratios of 1.19 during this period were consistent with coal combustion emissions. A later increase in Pb concentration, concurrent with a trend toward more radiogenic Pb-206/Pb-207 ratios in gasoline is consistent with an increased input of Pb from leaded gasoline emissions. However, it appears that coal combustion emissions remain a major source of Pb to the Okefenokee.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Atmospheric lead deposition to Okefenokee Swamp, Georgia, USA
Series title:
Environmental Pollution
Volume
130
Issue:
3
Year Published:
2004
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
445-451
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
445
Last page:
451
Number of Pages:
7