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This article in JEQ

  1. Vol. 35 No. 2, p. 450-458
    Received: Aug 18, 2005

    * Corresponding author(s): dgstrawn@uidaho.edu


Risk Assessment Test for Lead Bioaccessibility to Waterfowl in Mine-Impacted Soils

  1. Olha Furmana,
  2. Daniel G. Strawn *a,
  3. Gary H. Heinzb and
  4. Barbara Williamsa
  1. a University of Idaho, Moscow, ID 83844-2339
    b Patuxent Wildlife Research Center, Laurel, MD 20708


Due to variations in soil physicochemical properties, species physiology, and contaminant speciation, Pb toxicity is difficult to evaluate without conducting in vivo dose-response studies. Such tests, however, are expensive and time consuming, making them impractical to use in assessment and management of contaminated environments. One possible alternative is to develop a physiologically based extraction test (PBET) that can be used to measure relative bioaccessibility. We developed and correlated a PBET designed to measure the bioaccessibility of Pb to waterfowl (W-PBET) in mine-impacted soils located in the Coeur d'Alene River Basin, Idaho. The W-PBET was also used to evaluate the impact of P amendments on Pb bioavailability. The W-PBET results were correlated to waterfowl-tissue Pb levels from a mallard duck [Anas platyrhynchos (L.)] feeding study. The W-PBET Pb concentrations were significantly less in the P-amended soils than in the unamended soils. Results from this study show that the W-PBET can be used to assess relative changes in Pb bioaccessibility to waterfowl in these mine-impacted soils, and therefore will be a valuable test to help manage and remediate contaminated soils.

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Copyright © 2006. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA