Furman Olha, Strawn Daniel G, Heinz Gary H, Williams Barbara
University of Idaho, Moscow, ID 83844-2339, USA.
J Environ Qual. 2006 Feb 2;35(2):450-8. doi: 10.2134/jeq2005.0316. Print 2006 Mar-Apr.
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.
由于土壤理化性质、物种生理学以及污染物形态的差异，如果不进行体内剂量反应研究，铅的毒性很难评估。然而，此类试验成本高昂且耗时，使得它们在受污染环境的评估和管理中不切实际。一种可能的替代方法是开发一种基于生理学的提取试验（PBET），可用于测量相对生物可及性。我们开发并关联了一种PBET，旨在测量爱达荷州科达伦河流域受矿山影响土壤中铅对水禽的生物可及性（W-PBET）。W-PBET还用于评估磷改良剂对铅生物有效性的影响。W-PBET结果与野鸭[绿头鸭（Anas platyrhynchos (L.)）]喂食研究中的水禽组织铅水平相关。在添加磷的土壤中，W-PBET铅浓度显著低于未添加磷的土壤。本研究结果表明，W-PBET可用于评估这些受矿山影响土壤中铅对水禽生物可及性的相对变化，因此将是有助于管理和修复受污染土壤的一项有价值的试验。
