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This article in JEQ

  1. Vol. 35 No. 2, p. 450-458
     
    Received: Aug 18, 2005
    Published: Mar, 2006


    * Corresponding author(s): dgstrawn@uidaho.edu
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doi:10.2134/jeq2005.0316

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

Abstract

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