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

0607136Gschwend该项目寻求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(煤烟和焦炭)。PI假设这些黑碳颗粒通常是过去高估沉积物和土壤中疏水性有机污染物(HOC)平衡化学活性的原因，以及HOC在固体和流体/生物群之间转移缓慢的原因。这项研究将提高环境管理者合理分配资源清理危险场地的能力；拥有更准确的手段来评估沉积物和土壤中的临时移动性和生物有效性，将改进需要临时移动性或生物有效性的补救设计。该项目的结果将对其他研究人员和环境工程师制定和实施修复解决方案具有价值，这项工作可能会导致一种新的土壤和沉积物污染风险评估范式(基于动力学模型)。私人投资者对港口沉积物有丰富的经验，并从有大量资料的地方挑选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.