Investigation of carbon paste electrodes as supports for gold films in potentiometric stripping determination of coper(II) and mercury(II) traces

Abstract

Carbon paste electrodes containing either silicone or paraffin oil as pasting liquids have been investigated as possible supports for gold film formed either in situ or by electrodeposition. These electrodes, preplated with a thin gold film, were tested for stripping potentiometric determinations of traces of copper(II) and mercury(II). A detailed study has shown that the results obtained using these inexpensive and easily prepared electrodes are comparable with those obtained using conventional glassy carbon electrodes. Under optimized experimental conditions, low detection limits and good precision werw obtained. Compared with mercury film electrodes , the copper determination was more favorable on gold film electrodes due to lower RSD and higher slope of calibration curves.