Dr. Yong Cai's group conducts research in the field of environmental bioinorganic chemistry, biogeochemistry, and bioanalytical chemistry. Various research projects in his laboratory address many interrelated, molecular-level questions regarding the environmental fate and health effect of environmentally important metals and metalloids, such as mercury (Hg) and arsenic (As). Biogeochemical cycling of mercury in aquatic environments. Environmental fate and transformation of arsenic. Metabolism, toxicology, and clinical efficacy of arsenic compounds. Environmental implications of engineered nanomaterials.