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The field of aquatic chemistry begins with a focus on the speciation of solutes in aqueous solution (i.e. protonation level, complex formation with protons, hydroxide ions, metal ions, and ligands) and with pathways and rates of reaction. It now has been extended to include speciation and chemical reactions at solid/water interfaces. Expert's research focuses on metal-organic interactions: (i) how naturally-occurring and anthropogenic organic compounds influence the speciation, solid-water partitioning, and chemical reactions of metallic elements; and (ii) how natural concentrations of dissolved metal ions and loadings of metal (hydr)oxide solid phases influence the speciation, solid-water partitioning, and chemical reactions of naturally-occurring and anthropogenic organic compounds. Regarding speciation work, Expert's group has been developing capillary electrophoresis as an analytical tool. His group has extensive experience with the homogeneous solution reactions of industrial chelating agents and agricultural chemicals. Expert also has extensive experience with biochemicals exuded by organisms into soil and sediment interstitial waters. As far as solid/water interfaces are concerned, Expert has extensive experience regarding pathways and rates of oxidation-reduction, complex formation, and catalysis reactions involving (hydr)oxides of the first row transition metals and aluminum. Expert's work is primarily laboratory-based. He also has extensive experience with the quantitative treatment of equilibrium speciation and reaction kinetics using computer-based programs.

"Estimating Dermal Exposure to Chromium in Contaminated Lands: Pertinent (Bio)geochemistry", Rifkin and Associates (1997)."Manganese and Iron Deposition in Power Plant Cooling Water Systems", Public Service Electric & Gas Corporation, Newark, Newark New Jersey (1986-1987).