The shift in the potential of the zinc stripping current maximmn observed in anodic stripping voltammetry is related to the free energy of the reaction between ionic zinc and a complexing anion. The model was tested using the zinc hydroxyl system; the agreement with experimental results was excellent.The findings suggest the existence of the aqueous complex, Zn( OH ):, which has been reported only once beEore. The stability constant calculated here is in good agreement with the single published value.Anodic stripping voltammetry from thin layers and hanging drops of mercury was developed and used for determining the concentrations and the extent of organic chelation of some trace metals in natural waters (e.g. Matson 1968; Fitzgerald 1970; Seitz 1970; Zirino and Healy 1972; Bradford 1972). A phenomenon associated with the technique that has received scant attention is the shift in the potential of the stripping current maximum (the so-called stripping peak potential, EP) with changes in the activity oE a complexing anion in the test solution. The phenomenon is implied by the equations of Roe and Toni ( 1965) and was discussed by Matson (1968) high intensity ultraviolet light (Armstrong and Tibbitts 1968) to break up the naturally occurring chelators, and thus suggested that shifts in E, could be caused only by inorganic ligands. Nicholson and Shain ( 1964) showed that in stationary polarography a shift in the potential of the peak oxidation current with varying complexing anion activity requires that the reaction between the metal cation and the complexing anion be fast relative to the rate at which the metal cation is oxidized from the mercury electrode. Bradford ( 1972)
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