• 대한화학회지
• /
• 제36권5호
• /
• pp.652-660
• /
• 1992

폴리아민 리간드인 diethylenetriamine(dien), triethylenetetramine(trien), tetraethylenepentamine(tetren), 및 pentaethylenehexamine(penten)을 Chloromethylated Polystyrene $({\circledP}-) 수지에 반응시켜 각기 {\circledP}_L-Dien, {\circledP}_L-Trien, {\circledP}_L-Tetren 및 {\circledP}_L-Penten 수지를 합성한 후 Bjerrum법으로 pH를 측정하여 산해리상수 및 금속과의 안정도상수를 결정하였으며, Van't Hoff 식에 의해 {\Delta}H와 {\Delta}G도 구하였다. 이들 수지의 안정도상수(log k1)는 금속이온의 종류에 따라 Cu(Ⅱ) > Ni(Ⅱ) > Cd(Ⅱ) > Zn(Ⅱ) > Co(Ⅱ)의 순으로 감소하였으며, 수지중 주게 원자인 질소수가 증가함에 따라 {\circledP}_L-Dien < {\circledP}_L-Trien < {\circledP}_L-Tetren < {\circledP}_L-Penten의 순으로 증가하였다. 그리고 pH 변화에 대한 금속이온의 흡착량 및 분리도를 시험해 본 결과 이들 금속이온과의 안정도 상수값의 순서와 일치하였다.

• 한국환경보건학회지
• /
• 제29권2호
• /
• pp.62-68
• /
• 2003

Differential pulse voltammetry (DPV) using nafion-coated glassy carbon electrodes modified with Tetren(tetraethylene pentamine)-glycerol showed sensitivity for determining lead (II) at low concentration. The Lead (II) was accumulated on the electrode surface by the formation of the complex in an open circuit, and the resulting surface was characterized by medium exchange, electrochemical reduction, and differential pulse voltammetry. Various experimental parameters, such as the composition of modifier, preconcentration time, pH of electrolyte (0.1 M acetate buffer), and parameters of differential pulse voltammetry, were optimized. The initial potential was applied for 50 s, the electrode was scanned from -0.9 to -0.3 V, and the anodic peak current was measured at -0.604 V $\pm$ 0.015 V (vs. Ag/AgCl). The calibration plot was obtained in the range 1.0$\times$10$^{-8}$ M~l.0$\times$10$^{-6}$ M with pH 4.5 buffer solution. The detection limit (3$\sigma$) it as low as 5.0$\times$ 10$^{-9}$ M. This method is applied to the determination of lead(II) in a certified reference material and the result agrees satisfactorily with the certified value.