Abstract
Voltammetric analysis of mercury ions was developed using paste electrodes (PEs) with DNA and carbon nanotube mixed electrodes. The optimized analytical results of the cyclic voltammetry (CV) of the 1∼14 ng L(-1) Hg(II) concentration and the square wave (SW) stripping voltammetry of the 1∼12 ng L(-1) Hg(II) working range within an accumulation time of 400 seconds were obtained in 0.1 M NH(4)H(2)PO(4) electrolyte solutions of pH 4.0. For the relative standard deviations of the 1 ng L(-1) Hg(II), which were observed at 0.078% (n = 15) at the optimum conditions, the low detection limit (S/N) was pegged at 0.2 ng L(-1) (7.37 × 10(-13)M) for Hg(II). The results can be applied to assays in biological fish kidneys and wastewater samples.