Black Carbon in Sediment/Soil Aggregates: Quantification and Characterization by Electron Microscopy and Impacts on the Sorption of Organic Compounds

[607136]该项目旨在开发电子显微镜方法，以比以前更详细地量化沉积物和土壤中的黑碳（烟灰和炭）。PIs假设，这些黑碳颗粒通常是过去对沉积物和土壤中疏水有机污染物（HOC）平衡化学活性高估的原因，也是HOC在固体和流体/生物群之间缓慢转移的原因。本研究将提高环境管理者合理配置资源以清理有害场所的能力；拥有更准确的方法来评估沉积物和土壤中HOC的流动性和生物利用度，将改善需要HOC流动性或生物利用度的修复设计。这个项目的结果将对其他研究人员和环境工程师开发和实施修复方案有价值，这项工作可能会导致污染土壤和沉积物的新的风险评估范式（基于动力学模型）。pi在港口沉积物方面有丰富的经验，并从存在大量信息的地方选择了相关的沉积物和土壤，以方便他们的工作。

0607136GschwendThis project seeks to develop electron microscopy methods to quantify black carbon (soot and char) in sediments and soils in greater detail than has been achieved previously. The PIs hypothesize that these black carbon particles often are the cause of both past overestimates of equilibrium chemical activities of hydrophobic organic contaminants (HOC) in sediments and soils and the slow transfers of HOCs between the solids and fluids/biota. This research will improve the ability of environmental managers to rationally allocate resources to clean up hazardous sites; having a more accurate means to assess HOC mobility and bioavailability in sediments and soils will improve remediation designs that require HOC mobility or bioavailability. The results of this project will be valuable to other researchers and environmental engineers developing and implementing remediation solutions and the work may result in a new risk assessment paradigm (based on kinetic models) for contaminated soils and sediments. The PIs have extensive experience with harbor sediments and have chosen relevant sediments and soils from localities where considerable information exists to facilitate their work.