Collaborative Research: Biogeochemical Controls on Arsenic Remobilization From Sediments

0201943 拟议的项目将研究砷从沉积物中的移动，在那里它发生在与铁氢氧化物。 该项目将侧重于一个具体的研究地点，即加州奥兰查附近的北海威水库，在那里，砷向沉积物的输入受到已知持续时间和规模的工程实践的控制，这一直是研究小组进行初步研究的主题。 该项目侧重于一个特定的现场，因为该网站提供的独特机会。 预计在海威铁和砷的动员机制将相关的各种铁为主的系统，包括含水层沉积物。 此外，从沉积物中砷释放的时间尺度和这些时间尺度的因素上获得的信息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.