KMID : 1059519980420010028
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Journal of the Korean Chemical Society 1998 Volume.42 No. 1 p.28 ~ p.35
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Anodic Stripping Voltammetric Determination of Cadmium(¥±) Using Alga-Modified Carbon Paste Electrodes
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Bae Zun-Ung
Choi Jung-Eun Chang Hye-Young
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Abstract
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Microorganisms such as alga are able to uptake toxic and heavy metal ions. After Cd(¥±) was preconcentrated on the carbon paste electrode constructed by incorporating alga (Anabaena), it was determined with differential pulse anodic stripping voltammetry. A well-defined oxidation peak of Cd(¥±) was obtained at - 0.75 V vs. SCE. We investigated the optimum conditions using the peak, which are the effect of the amount of alga, pH, ionic strength, temperature, and preconcentration time on the preconcentration of Cd(¥±) and that of the reduction time and potential on the reduction of Cd(¥±) preconcentrated. Calibration curve for the determination of Cd(¥±) was linear over the range of 1.0¡¿10-6 M to 8.0¡¿10-6 M (R=0.9978) and the detection limit was 5.0¡¿10-7 M. The relative standard deviation was 3.1% (n=6) for 7.0¡¿10-6 M Cd(¥±). In regeneration of the electrode surface with 0.1 M HCl, the response was reproducible continuously by 10 times.
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