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

应用 13C 示踪剂研究和稳定同位素地球化学来确定受污染地介质中 PAH 生物利用度的根际变化。

• 批准号: 0337453
• 负责人: Elizabeth Nichols
• 金额: --
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0337453&HistoricalAwards=false
• 关键词: Applications; 13C; tracer; studies; stable

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.

0337453 Nichols 拟议研究的重点是确定根际环境如何影响 PAH 老化和生物利用度。 该提案的新颖之处在于，研究人员将评估根际中可能增加或减少 PAH 生物利用度的活动。 例如，由于渗出物破坏 SOM 的稳定性并增强 PAH 的解吸，可以提高生物利用度，或者通过提供新的疏水性吸附表面和刺激腐殖化反应（将 PAH 螯合在稳定的有机物中）来降低生物利用度。 同位素示踪技术将用于评估植被对多环芳烃生物利用度的影响。该提案描述了实现科学合理的拟议目标的详细实验方法。