PERSISTANCE OF NAPL CONTAMINANTS IN NATURAL SUBSURFACE SYSTEMS

非水相有机液体是一种广泛存在的污染物 地下土壤和地下水。从人类健康的角度来看，这些 有机液体特别值得关注，因为它们往往代表 长期污染源，创造多样和持久的途径 以备最终的人类接触。本项目拟开展的工作是 旨在调查影响人类健康的过程 阿司匹林的包封性、持久性、转运、生物利用度和毒性 自然地下环境中的有机液体成分。它 代表一个基础研究计划，该计划建立在以前和 目前由NIEHS资助的项目，并将实验室和数学 模拟调查。子项目A侧重于 苯、甲苯、二甲苯(BTX)和氯化溶剂化合物。它的 具体目标与调查物理因素的影响有关 有机液体包裹率和质量的化学非均质性 传递、影响和量化的倍数，耦合 关于污染物去向和迁移的过程。我们将特别注意 旨在通过CLOSE阐明微生物过程 与项目1调查人员合作。因此，建议的工作是 旨在逻辑地扩展在以前的NIEHS中获得的知识- 受资助的项目要考虑多个过程的相互作用， 化学和物理异质性对这些过程的影响， 以及复杂的NAPL混合物的行为和命运。虽然是定向的 主要是对自然产生的衰减进行调查 过程中，从这些研究中获得的知识将立即 应用程序来设计更有效的补救策略。

Nonaqueous phase organic liquids are widespread contaminants of subsurface soils and groundwater. From a human health perspective, these organic liquids are of particular concern because they tend to represent long-term sources of pollution and create diverse and persistent pathways for eventual human exposure. The work proposed in this project is directed towards the investigation of processes which influence the entrapment, persistence, transport, bioavailability, and toxicity of organic liquid components in the natural subsurface environment. It represents a fundamental research program which builds upon previous and current NIEHS-funded projects and integrates laboratory and mathematical modeling investigations. Subproject A focuses on the behavior of benzene, toluene, xylene (BTX) and chlorinated solvent compounds. Its specific aims relate to the investigation of the influence of physical and chemical heterogeneities on organic liquid entrapment and mass transfer, and the quantification of the influence of multiple, coupled processes on contaminant fate and transport. Special attention will be directed to the elucidation of microbial processes through close collaboration with Project 1 investigators. Thus, the work proposed is designed to logically extend the knowledge gained in previous NIEHS- funded projects to consider the interaction of multiple processes, the influence of chemical and physical heterogeneities on these processes, and the behavior and fate of complex NAPL mixtures. Although directed primarily at the investigation of naturally occurring attenuation processes, the knowledge gained from these studies will have immediate applications to the design of more effective remediation strategies.