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

拟议研究的重点是确定根际环境如何影响多环芳烃的老化和生物利用度。这一提议的新颖之处在于，研究人员将评估根际中可能增加或减少多环芳烃生物利用度的活动。例如，由于渗出物破坏SOM的稳定并增强多环芳烃的解吸，生物利用度可能会增加，或者通过提供新的疏水吸附表面和刺激腐殖质化反应来降低生物利用度，而腐殖质化反应可以将多环芳烃隔离在稳定的有机物中。同位素示踪技术将用于评价植被对多环芳烃生物可利用性的影响。该提案描述了一种详细的实验方法，以实现科学合理的拟议目标。

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.