Collaborative Research: Biogeochemical Controls on Arsenic Remobilization From Sediments

0201943 O‘Day拟议的项目将审查与氢氧化铁有关的沉积物中砷的动员情况。该项目将集中在加利福尼亚州奥兰查附近的北海威水库这一特定的研究地点，在那里，砷进入沉积物的过程由已知持续时间和规模的工程实践控制，这是研究小组初步研究的主题。该项目将重点放在一个特定的现场，因为该地点提供了独特的机会。预计海威的铁和砷动员机制将与各种以铁为主的系统有关，包括含水层沉积物。此外，所获得的关于沉积物中砷释放的时间尺度和支配这些时间尺度的因素的信息将增进对接触孔隙水和地下水中砷浓度的动力学控制的了解。

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.