GEOC 116 |
| Olha Furman, Soil and Land Resources Devision, University of Idaho, 1017 E. 7th St. , Ag Sci Bldg 242, Moscow, ID 83844-2339 and Daniel G. Strawn, Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID 83844. |
| Ingestion of soils contaminated with lead from mining and smelting operations is causing high rates of waterfowl deaths in the Coeur d’Alene River Basin of Idaho. The objective of this study is to investigate the effectiveness of phosphorus amendments to reduce lead bioavailability to waterfowl in contaminated seasonal wetland soils. Lead bioavailability is site-specific; dependent on soil chemistry, Pb speciation, and animal diet. In the contaminated wetlands Pb is associated with iron and manganese minerals, which may undergo reductive dissolution. Therefore, seasonal changes may affect lead mobility and bioavailability. In this study the relationship between Pb bioavailability in the reduced and oxidized P-amended soils is investigated. An in-vitro physiologically based extraction test that incorporates gastrointestinal tract parameters representative of waterfowl was developed to measure lead bioavailability to waterfowl (W-PBET). The W-PBET was correlated with an in-vivo Pb bioavailability test on Mallard ducks (bird-feeding study). Results from this study will help design remedial strategies at contaminated sites. |
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Poster Session
6:00 PM-9:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Geochemistry |