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Electrochemical detection of trace cadmium in soil using a Nafion/stannum film-modified molecular wire carbon paste electrodes

Author:
Wang, Zhiqiang  Liu, Gang  Zhang, Linan  Wang, Hui  


Journal:
IONICS


Issue Date:
2013


Abstract(summary):

In this paper, a novel Nafion polymer-coated stannum film-modified carbon paste electrode was developed for the analysis of trace cadmium by square wave anodic stripping voltammetry. The electronic conductive material-molecular wire (diphenylacetylene)-was employed as the binder instead of traditional mineral oil for fabricating this electrode. It was found that the prepared electrode possessed excellent electrochemical performance and increased electron transfer rate due to the introduction of molecular wire as a binder, and exhibited a better sensitivity and stability as well as high resistance to surfactants due to the synergistic effect of Nafion and stannum film. Under the optimal conditions, the stripping peak currents showed a good linear relationship with the Cd(II) concentration in the range from 1.0 to 80.0 mu g L-1 with a detection limit of 0.13 mu g L-1 (S/N = 3). The developed electrode was further applied to the determination of Cd(II) in soil extracts with satisfactory results.


Page:
1687---1693


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