비스무스 나노분말 표지 전극의 카드뮴/납 검출특성에 관한 연구
A Study on Detection Characteristics of Cadmium and Lead for Bi Nanopowder-Labeled Electrode
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Trace analysis of Cd and Pb at surface modified thick film graphite electrode with Bi nanopowder has been carried out using square-wave anodic stripping voltammetry (SWASV) technique. Bi nanopowder synthesized by gas condensation (GC) method showed the size of 50~100 nm with BET surface area, ABET = 6.8 m² g-1. For a strong adhesion of the Bi nanopowder onto the screen printed carbon paste electrode, nafion solution was added into Bi-containing suspension. From the SWASV, it was found that the Bi nanopowder electrode exhibited a well-defined responses relating to the oxidations of Cd and Pb. The current peak intensity increased with increasing concentration of Cd and Pb. From the linear relationship between Cd/Pb concentrations and peak current, the sensitivity of the Bi nanopowder electrode was quantitatively estimated. The detection limit of the electrode was estimated to be 0.15 mg/l and 0.07 mg/l for Cd and Pb, respectively, on the basis of the signal-to-noise characteristics (S/N=3) of the response for the 1.0 μg/l solution under a 10 min accumulation.
Abstract
Trace analysis of Cd and Pb at surface modified thick film graphite electrode with Bi nanopowder has been carried out using square-wave anodic stripping voltammetry (SWASV) technique. Bi nanopowder synthesized by gas condensation (GC) method showed the size of 50~100 nm with BET surface area, ABET = 6.8 m² g-1. For a strong adhesion of the Bi nanopowder onto the screen printed carbon paste electrode, nafion solution was added into Bi-containing suspension. From the SWASV, it was found that the Bi nanopowder electrode exhibited a well-defined responses relating to the oxidations of Cd and Pb. The current peak intensity increased with increasing concentration of Cd and Pb. From the linear relationship between Cd/Pb concentrations and peak current, the sensitivity of the Bi nanopowder electrode was quantitatively estimated. The detection limit of the electrode was estimated to be 0.15 mg/l and 0.07 mg/l for Cd and Pb, respectively, on the basis of the signal-to-noise characteristics (S/N=3) of the response for the 1.0 μg/l solution under a 10 min accumulation.
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