摘要
在HAc-NaAc(pH=3.50)的溶液中,Cu2+与茜素红S生成配合物,该配合物在滴汞电极上于-0.18 V(vs.SCE)产生一个灵敏的配合吸附波。用单扫描示波极谱法与循环伏安法研究了该体系的极谱行为和反应机理。试验表明,该极谱波属于有吸附性的不可逆过程,测得电极反应电子转移数n=2,H+反应数n′=2。用单扫描示波极谱法可以测定痕量Cu2+,测定的线性范围为0.005～0.100 mg/L,该方法用于环境水样与茶叶中痕量铜的测定,结果令人满意。
It was found that in a HAc-NaAc buffer medium of pH3.50 , the complex of Cu （ Ⅱ ） and alizarin red S gave a sensitive complexing adsorptive wave.Its 2nd derivative peak potential was -0.18 V （vs.SCE）. The polarographic behavior and the mechanism of the electrode reaction were studied by single sweep oscillopolarography and cyclic voltammetry. The electrode reaction system was adsorptive nonreversible process. The number of electron transfer was found to be 2, and the number of H^＋ involved in the reaction was also 2. The linear relationship between peak height and the concentration of Cu（ Ⅱ ） held in the range of 0.005-0.100 mg/L by single sweep oscillopolarography. The method was used satisfactorily in the determination of copper in the environmental water and Teas samples.
出处
《安徽工业大学学报（自然科学版）》
CAS
2007年第4期403-405,共3页
Journal of Anhui University of Technology（Natural Science）
关键词
单扫描极谱法
铜
茜素红S
配合吸附波
single-sweep oscillopolarography
copper
alizarin red S
complex adsorptive wave
