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

9316745中国湿地是一种极为重要的自然资源，因为它们具有高度的生产力和生物多样性，并为许多濒危物种提供了避难所。这种独特的环境也可以被“改造”来处理水生污染物。来自农业径流、大气沉降和其他非点源的合成有机化合物（soc）威胁着它们的生态。湿地生态系统中有机碳命运和运输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，并使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流动性影响的研究将(1)测量环境间有机碳的原位分布，(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区反应性。(5)将有机胶体的性质与其与soc反应的倾向联系起来。样本将从俄亥俄州的三个地点收集：老妇溪、雪松沼泽和哥伦布市拟议的奥坦奇河人工湿地。这项研究将有助于我们更好地理解和提高我们模拟胶体在控制湿地和水生系统中有机污染物的命运和运输中的作用的能力。从这个项目中积累的信息应该有助于那些负责管理生态系统的个人，并帮助工程师正确地设计和建造湿地，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.