The geochemical speciation of transition metals and chelating agents ultimately determines bioavailability, solubility, and the transport of nutrient or cytotoxic metals. There is wide use of phosphonate-containing chelating agents as herbicides, corrosion inhibitors, and detergent builders. Their presence in the environment necessitates a geochemical understanding of their behavior. Our research focuses on determining the reaction kinetics of ligand exchange reactions involving phosphonate-containing chelating agents and nickel. Capillary electrophoresis with ultraviolet spectrophotometric detection was used to monitor nickel(II) cyclohexaneethylenediaminetetraacetate (NiCDTA) production following the addition of CDTA to N,N-bis(phosphonomethyl)glycinenickel(II) (NiBPMG) solution. Initial rates were determined over a pH range and at varying chelating agent concentrations. A pathway for the ligand exchange reaction is proposed.

Influence of pH on ligand exchange rate with phosphonate-containing chelating agents

249th National Meeting (2015)

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