My research interests lie in the broad area of environmental sciences, particularly with respect to environmental chemistry, analytical chemistry, and biogeochemistry of biomedically important contaminants, in particular toxic metals and metalloids (mercury and arsenic, for instance). Examples of my research work include:

Environmental Chemistry: Speciation, fate, transport, transformation, and bioaccumulation of mercury in natural aquatic environments (e.g., the Everglades) as well as in contaminated sites (through industrial mercury discharge or mercury mining); Transformation and transport of arsenic species from natural and anthopogenic sources in the environment.

Analytical Chemistry: Development and application of methodology for speciation of chemically specific metal as well as for fractionation of geochemically defined toxic metal species; Development of techniques for physiologically defined metal species and application of these techniques to study metabolism of toxic metals in biological systems.

Biogeochemistry: Biogeochemical cycling of mercury at the ecosystem level; Controls of geochemical factors (e.g., natural organic matter) and processes (e.g., redox reaction) on speciation, mobility, reactivity, and bioavailability of mercury and arsenic species; Synoptic analysis of environmental data and implications on environmental monitoring, remediation, management, and policy.