Collaborative Research: The Geochemistry of Aquatic Organic Colloids & Their Role in Mobilizing Synthetic Organic Contaminants in Wetland Ecosystems

9316745中国湿地是一种极其重要的自然资源，因为它们具有高生产力和生物多样性，并为一些濒危物种提供栖息地。这种独特的环境也可以用来处理水生污染物。来自农业径流、大气沉积和其他非点源的合成有机化合物(SOC)威胁着它们的生态。湿地生态系统中SOC去向和迁移的一个方面是可移动有机胶体的作用，它可以结合许多不受欢迎的有机物质，并提高一些水相浓度，远远超出平衡预期。有机胶体对湿地环境中有机碳形态和迁移性的影响研究将：(1)测量有机碳在环境区块之间的原位分布；(2)确定湿地中有机胶体的丰度和分布；(3)表征有机胶体的物理化学性质；(4)确定湿地有机胶体对有机碳的分配活性；(5)将有机胶体的性质与其与有机碳的反应倾向相关联。样本将从俄亥俄州的三个地点采集：老妇人溪、雪松沼泽和哥伦布拟议的奥伦唐吉河人工湿地。拟议的研究将加深我们对胶体在控制湿地和水生系统中有机污染物的去向和迁移中的作用的理解和提高我们的建模能力。从这个项目中获得的信息应该有助于那些负责管理生态系统的个人，并帮助工程师适当地设计和建设湿地，以修复非点源污染物。

9316745 Chin Wetlands are a natural resource of paramount importance in that they are highly productive and biodiverse, and provide shelter for a number of endangered species. This unique environment can also be "engineered" to treat aquatic pollutants. Synthetic organic compounds (SOCs) from agricultural run-off, atmospheric deposition, and other nonpoint sources threaten their ecology. One aspect of SOC fate and transport in a wetland ecosystem that is poorly understood is the role of mobile organic colloids that can bind many nonpopular organic substances and enhance some aqueous phase concentrations well beyond equilibrium expectations. The proposed study of the effects of organic colloids on the speciation and mobility of SOCs in wetland environments will (1) measure the in situ distribution of SOCs between environmental compartments, (2) determine the abundances and distribution of organic colloids in wetlands, (3) characterize the physiochemical properties of organic colloids, (4) determine the partition reactivity of wetland organic colloids to SOCs, and (5) correlate the properties of organic colloids with their propensity to react with SOCs. Samples will be collected from three sites in Ohio: Old Woman's Creek, Cedar Bog, and the proposed Olentangy River constructed wetlands in Columbus. The proposed research will better our understanding of and improve our ability to model the role of colloids in controlling the fate and transport of organic pollutants in wetlands and aquatic systems. The information accrued from this project should aid those individuals responsible for managing ecosystems, and help engineers properly design and construct wetlands for purposes of remediating nonpoint source pollutants.