Collaborative Research: Biogeochemical Controls on Arsenic Remobilization From Sediments

提议的项目将研究砷在沉积物中与铁氢氧化物结合时的动员情况。该项目将集中在一个特定的研究地点，即加利福尼亚州奥兰卡附近的北海威水库，在那里，砷进入沉积物是由已知持续时间和规模的工程实践控制的，这是研究小组初步研究的主题。该项目专注于一个特定的场地，因为该场地提供了独特的机会。预计海威地区铁和砷的运移机制可能与包括含水层沉积物在内的多种铁主导系统有关。此外，在沉积物中砷释放的时间尺度上获得的信息以及控制这些时间尺度的因素将增加对接触孔隙水和地下水中砷浓度的动力学控制的理解。

0201943 O'Day The proposed project will examine the mobilization of arsenic from sediments where it occurs in association with iron oxyhydroxides. The project will focus on a specific study site, North Haiwee Reservior near Olancha, California, where the input of arsenic to the sediments is controlled by engineering practices of known duration and magnitude and which has been the subject of a preliminary study by the research group. The project focuses on a specific field site because of the unique opportunities that site offers. It is anticipated that the mechanisms of iron and arsenic mobilization at Haiwee will be relevant to a variety of iron-dominated systems including aquifer sediments. Further, the information that is obtained on the timescales for arsenic release from sediments and the factors governing these timescales will increase understanding of the kinetic controls on arsenic concentrations in contacting porewaters and groundwaters.