Applications of 13C tracer studies and stable isotope geochemistry to determine rhizosphere alteration of PAH bioavailability in contaminated geomedia.

0337453尼科尔斯拟议研究的重点是确定根际环境如何影响多环芳烃老化和生物利用度。 这项提议的新颖之处在于，研究人员将评估根际的活动，这可能会增加或减少PAH的生物利用度。 例如，生物利用度可以增加的结果，渗出物不稳定的SOM和增强PAH的解吸或减少提供新的疏水吸附表面和刺激腐殖化反应，起到螯合多环芳烃在稳定的有机物质。 同位素示踪技术将用于评估植被对PAH生物利用度的影响。该提案描述了实现拟议目标的详细实验方法，具有科学合理性。

0337453 Nichols The focus of the proposed research is to determine how the rhizosphere environments impact PAH aging and bioavailability. The novel aspect of this proposal is that the researchers will evaluate activity in the rhizosphere that could both increase or decrease PAH bioavailability. For example, bioavailability could be increased as the result of exudates destabilizing SOM and enhancing the desorption of PAH or decreased by providing new hydrophobic sorption surfaces and stimulating humification reactions that act to sequester PAHs in stable organic matter. Isotopic tracer techniques will be used to evaluate the impact of vegetation on PAH bioavailability. The proposal described a detailed experimental approach for accomplishing the proposed objectives that is scientifically sound.