CAJ | 학술논문

用碳纳米管和纳米TiO2混合修饰碳糊电极,用循环伏安法考察了修饰电极测量Cu的优化条件及其电化学稳定性。结果表明,在pH=5.5的HAc-NaAc缓冲溶液中,当Cu2＋在修饰电极表面富集200 s、电位扫描速率控制在60 mV/s时,修饰电极在循环伏安图上能出现1个灵敏氧化峰,峰电位为0.141V,利用这个峰可以对Cu进行检测。峰电流与Cu2＋的浓度在1.0×10-7～1.0×10-4 mol/L的范围内成良好线性关系,相关系数为0.994 4,检出限为1.43×10-8mol/L。
용탄납미관화납미TiO2혼합수식탄호전겁,용순배복안법고찰료수식전겁측량Cu적우화조건급기전화학은정성。결과표명,재pH=5.5적HAc-NaAc완충용액중,당Cu2＋재수식전겁표면부집200 s、전위소묘속솔공제재60 mV/s시,수식전겁재순배복안도상능출현1개령민양화봉,봉전위위0.141V,이용저개봉가이대Cu진행검측。봉전류여Cu2＋적농도재1.0×10-7～1.0×10-4 mol/L적범위내성량호선성관계,상관계수위0.994 4,검출한위1.43×10-8mol/L。
Nanotubes and nano-TiO2 mixed to modify carbon paste electrode,optimum conditions for detection of trace copper at the modified electrode and the electrochemistry stability of the modified electrode were investigated by cyclic voltammetry.There was a sensitive oxidation peak in the cyclic voltammogram at 0.141 V characteristic of trace copper in 0.10 mol/L HAc-NaAc buffer whose pH value was 5.5 when the accumulation time was 200 s and the potential scan rate was 60 mV/s.There was a good liner relationship between the peak current and Cu2＋ concentration in a range of 1.0×10-7～1.0×10-4 mol/L with a correlation coefficient of 0.994 4,and the detection limit was 1.43×10-8 mol/L.