Influence of Soil Particle Size Fractions and Environmental Conditions on Fate and Transport of Hormones in Soils

1067537张将进行吸附和解吸批量测试，并使用创新的土板反应器来同时检测地表径流、渗滤液和土壤中受降雨事件、老化时间和土壤深度影响的激素及其中间体。这项工作的具体目标是确定：(1)激素如何与不同的土壤成分(例如胶体)相关联或解离；以及(2)环境条件(例如土壤/水化学)将如何影响激素与土壤之间的相互作用。在膜过滤技术的帮助下，将测定反应器中固体和液体舱中与不同土壤成分和不同粒级相关的激素。等电点将确定吸附和解吸过程的动力学参数，激素和土壤成分之间的相互作用，以及在不同试验条件下调节激素-S去向和运输的可能机制。该项目不仅将增加对不同条件下激素及其结合物或中间体在土壤/水环境中的释放、去向和运输的了解，而且还将增加关于如何利用改进的基本原理将批量测试的结果与田间条件(如土板反应器模拟的)相结合的知识。这项研究中开发的结果和方法具有潜在的变革性，并可能导致描述和预测污染物在环境中的命运和迁移的范式转变。就更广泛的影响而言，这项工作的结果可以被决策者、研究人员和工程师用来制定或修改有关使用粪便和向环境排放污染物的法规。学生将接受强化培训，部落学院的本科生将参与到该项目中来。将加强内布拉斯加大学的教育和研究能力。PI将利用这个项目作为一种工具，通过卓越学院计划和工程周来培训高中生和教师，这将有助于招收不同种族的学生。

Abstract1067537 ZhangThe PI will conduct sorption and desorption batch tests, and use an innovative soil slab reactor to simultaneously detect hormones and their intermediates in surface runoff, leachate, and soil as affected by rainfall events, aging times, and soil depths. The specific objectives of this work are to determine: (1) how hormones will associate or dissociate with different soil components (e.g., colloids); and (2) how environmental conditions (e.g., soil/water chemistry) will affect interactions between hormones and soils. Hormones associated with different soil components and size fractions in the solid and liquid compartment of the reactor will be determined with the help of membrane filtration technology. The PI will determine kinetic parameters of sorption and desorption processes, interactions between hormones and soil components, and possible mechanisms governing a hormone?s fate and transport under different test conditions. This project will not only increase understanding of releases, fate, and transport of hormones, their conjugates or intermediates in the soil/water environment under different conditions, but also increase knowledge of how to bridge the results from the batch tests with field conditions (as mimicked by the soil slab reactor) using the improved fundamentals. Results and methods developed in this research are potentially transformational, and may result in a paradigm shift as to characterizing and predicting the fate and transport of pollutants in the environment. In terms of broader impacts, results from this work can be used by decision-makers, researchers and engineers to develop or modify regulations concerning the use of manure and release of pollutants into the environment. Students will receive intensive training with undergraduates from tribal colleges being involved in the project. Enhancement of educational and research capacities at the University of Nebraska will be realized. The PI will use this project as a vehicle to train high school students and teachers via the Academy of Excellence Program and the Engineering Week, which will help to recruit ethnically diverse students.