Soil-atmosphere exchange of persistent organic pollutants: Determination of concentration gradients with passive samplers

本工作旨在促进对土壤在控制多环芳烃等持久性有机污染物的环境迁移中的作用的理解。为检测土壤和大气之间污染物的浓度(或逸度)梯度而开发的无源采样器将能够测量污染物运动的方向是进入土壤还是离开土壤，以回答土壤是污染物的汇还是源的问题。污染物交换行为的季节模式将与环境参数有关，如土壤水分含量、吸附能力、温度等。对比具有不同土壤特性和污染物输入历史的监测点的通量行为将有助于识别影响污染物迁移的关键景观特征。这项研究与伙伴机构通过涡旋协方差方法了解大气边界层内通量的持续努力相协调，将增强数据解释能力，并导致估计这些污染物的时间平均土壤-大气通量。

The present work aims to advance the understanding of the role of soils in controlling the environmental transport of persistent organic pollutants such as polycyclic aromatic hydrocarbons. Passive samplers developed to detect concentration (or fugacity) gradients of contaminants between soils and the atmosphere will enable measurement of whether the direction of contaminant movement is into or out of the soil in order to answer the question whether soils are sinks or sources for pollutants. Seasonal patterns of contaminant exchange behavior will be linked to environmental parameters, such as soil water content, sorption capacity, temperature, etc. Contrasting the flux behavior at monitoring locations that have different soil characteristics and contaminant input histories will aid in the identification of the key landscape features influencing contaminant mobility. Coordination of this study with ongoing efforts by partner institutions to understand flux within the atmospheric boundary layer by eddy covariance methods will augment data interpretive abilities and lead to estimations of time-averaged soil-atmospheric flux of these contaminants.