Atmospheric lead deposition to Okefenokee Swamp, Georgia, USA
| Autor: | Brian P. Jackson, P. V. Winger, Peter J. Lasier |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Geologic Sediments
Peat Georgia Health Toxicology and Mutagenesis Air pollution Coal combustion products Toxicology medicine.disease_cause Swamp Soil medicine Gasoline Isotope analysis Vehicle Emissions geography Air Pollutants Radiogenic nuclide geography.geographical_feature_category General Medicine History 20th Century Pollution Deposition (aerosol physics) Coal Lead Environmental chemistry Environmental science Physical geography Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 130(3) |
| ISSN: | 0269-7491 |
| Popis: | 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 210Pb-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 206Pb/207Pb 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 206Pb/207Pb 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. |
| Databáze: | OpenAIRE |
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