Combining molecular-level characterization techniques with field and “meso-scale” experimentation, we investigate the complex biogeochemical interactions that control arsenic mobility and bioavailability in anaerobic environments.  A specific motivation for this research comes from the problem of arsenic uptake into rice and contamination of the food chain, with broader implications for understanding of processes that mobilize arsenic and other elements into aquatic environments (e.g., groundwaters or surface waters used as drinking water supplies).  The vision for this research theme is to develop cost-effective approaches to control arsenic mobilization under complex and temporally-variable environmental conditions.  This research integrates techniques including arsenic speciation analysis via HPLC-ICP-MS, synchrotron-based X-ray absorption spectroscopy, and whole-cell biosensor assays.

People: Lena, Hyun, Anita, Xuhui