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Effect of model organic compounds on square-wave voltammetric stripping analysis at the Nafion/chelating agent mercury film electrodes
Authors:Jyh-Myng Zen  Fu-Shien Hsu  Nai-Yuen Chi  Sen-Yuan Huang  Mu-Jye Chung
Institution:

Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan

Abstract:The effect of various organic compounds on the Nafion/chelating agent mercury film electrodes (NCAMFEs) in square-wave anodic-stripping voltammetry (SWASV) is explored. Two chelating agents used to prepare the NCAMFEs are dimethylglyoxime and 2,2'-bipyridyl. Triton X-100, sodium dodecyl sulfate, albumin, gelatin, starch, camphor, and humic acid are used as model organic compounds, while cadmium, lead, and copper are used as test metal ions. The NCAMFEs are considerably more resistant to organic interferences than the Nafion-coated mercury film electrode. The implications of these interferences for the reliability and feasibility of stripping measurements using the NCAMFEs in real samples are discussed. Results presented for untreated urine and natural water samples demonstrate the analytical utility of the NCAMFEs in SWASV.
Keywords:Stripping voltammetry  Nafion  2  2'-Bipyridyl  Dimethylglyoxime
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