Use of ultramicroelectrodes for determining lead in natural waters by stripping voltammetry

Anin situ obtained graphite-fiber-based thin-film mercury microelectrode was used for determining lead(II) in natural water by stripping voltammetry without removing oxygen and using no supporting electrolyte. Under the optimum voltammetric conditions (E _el = -1.2 V,t _el = 5 min,c _Hg(II) = 1 x 10^-7 M, ΔE = 40 mV, v= 105 mV/s), the calibration graph was linear in the range of actual lead(II) concentrations in natural waters. At a lead(II) concentration of 0.002 mg/L, the RSD was 11%.