Abstract
Determination of cadmium(II) ion with a perfluorinated sulfonated polymer-ethylenediamine(nafion-en) modified glassy carbon electrode was studied. It was based on the chemical reactivity of an immobilized layer(nafion-en) to yield complex $[Cd(en)_2]^{2+}$. The reduction peak potential by differential pulse voltammetry(DPV) was observed at $-0.780({\pm}0.005)V$ vs. As/AgCl. The linear calibration curve was obtained in cadmium(II) ion concentration range $5.0{\times}10^{-7}-2.0{\times}10^{-5}M$, and the detection limit(3s) was $2.20{\times}10^{-7}M$. The detection limit of nafion-en modified glassy carbon electrode has been shown about 14 higher sensitivity than a bare glassy carbon electrode.
Perfluorinated sulfonated polymer-ethylenediamine(Nafion-en)이 화학수식된 유리탄소전극을 사용하여 Cd(II) 이온의 정량에 대해 연구하였다. Cd(II) 이온의 착화제인 ethylenediamine(en)을 nafion에 고정시켜 유리탄소전극 표면에 수식하면 이 수식전극의 en은 Cd(II) 이온과 $[Cd(en)_2]^{2+}$의 착물을 형성한다. Nafion-en이 화학수식된 유리탄소전극에서 시차펄스전압전류법에 의한 Cd(II) 이온의 환원봉우리전위는 $-0.780({\pm}0.005)V$(vs. Ag/AgCl), 측정범위는 $5.0{\times}10^{-7}-2.0{\times}10^{-5}M$, 검출한계(3s)는 $2.20{\times}10^{-7}M$이었다. Nafion-en이 화학수식된 유리탄소전극의 검출한계가 수식되지 않은 유리탄소전극에 비해 약 14배 정도 향상되었다.