Add time:08/07/2019 Source:sciencedirect.com
Lead speciation in many aqueous geochemical systems is dominated by carbonate complexation. However, direct observations of Pb2+ complexation by carbonate ions are few in number. This work represents the first investigation of the equilibrium Pb2++CO32-⇌PbCO30 over a range of ionic strength. Through spectrophotometric observations of PbCO30 formation at 25 °C in NaHCO3–NaClO4 solutions, PbCO30 formation constants of the form CO3β1=[PbCO30]/[Pb2+][CO32-] were determined between 0.001 and 5.0 molal ionic strength. Formation constant results were well represented by the equation: logCO3β1=(6.789±0.022)-4.088·I0.51+1.5I0.5+(0.244±0.012)I
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