Project 4: Dynamic Transport and Exposure Pathways of Contaminants in Karst

项目4的目标是确定岩溶地下水系统中有机污染物混合物的释放、流动性、持久性和可能途径的主要归宿和迁移过程。本项目将使用邻苯二甲酸二（2-乙基己基）酯（DEHP）作为模型半极性有机物，三氯乙烯（TCE）作为模型非极性有机物。该项目将确定影响岩溶地下水中DEHP和TCE的归宿和迁移的主要机制，其特征是可变导管和/或扩散主导的流动;评估截留和移动的非水性TCE对溶解DEHP归宿和迁移的影响;评估波多黎各北方岩溶地下水系统的潜在污染途径和暴露;并探讨DEHP污染物从无衬里垃圾填埋场向岩溶地下水系统的潜在释放和淋溶机制。具体的施舍将通过定义的实验获得 这些活动涉及水文地球物理系统一级的数据评价和综合，以及实验室一级的潜在污染源、归宿和迁移过程的物理建模。

The objective of Project 4 is to determine the principal fate and transport processes for the release, mobility, persistence, and possible pathways of mixtures of organic contaminants toward potential exposures and/or remediation zones in karst groundwater systems. The Project will use Di(2-ethylhexyl) phthalate (DEHP) as a model semipolar organic and trichloroethylene (TCE) as a model nonpolar organic. The project will determine the major mechanisms influencing the fate and transport of DEHP and TCE in karst groundwater characterized by variable conduit and/or diffusion dominated flow; assess the effect of trapped and mobile non-aqueous TCE on the fate and transport of dissolved DEHP; assess potential contamination pathways and exposure through the karstic groundwater system in northern Puerto Rico; and explore the mechanisms for potential release and leaching of DEHP contaminants from unlined landfills into karst groundwater systems. Specific alms will be attained through defined experimental activities, which Involve data evaluation and integration at the hydrogeophysical system level and physical modeling of potential contaminant sources and fate and transport processes at the laboratory-scale level.