摘要
研究了镉(Ⅱ)-铜铁试剂络合物的伏安行为,在0.15mol·L^(-1)NH_4Ac(pH6.7)、0.5 mmol·L^(-1)Cup溶液中,用单扫示波极谱得到一灵敏的Cd(Ⅱ)-Cup络合吸附波。峰电位E_P=-0.69 V(vs.SCE),峰电流与镉(Ⅱ)浓度在0.01～1.5μmol·L^(-1)范围内成正比,检出限为5.0mol·L^(-1)。用等摩尔系列法测得络合物的络合比为1:2,表观稳定常数为6.1×10^(11)。用线性扫描和循环伏安法、常规脉冲极谱等手段研究络合物电极反应机理。实验表明,该体系为可逆吸附波。
Voltammetric behaviour of the cadmium(Ⅱ)-cupferron complex is investigated. In 0.15 mol·L^(-1)NH_4Ac(pH 6.7)supporting electrolyte containing 0.5 mmol·L^(-1) Cup, a sensitive adsorptive complex wave of Cd(Ⅱ)-Cup is obtained by using linear sweep oscillopolarography. The peak potential E_p is -0.69V(vs. SCE), the peak current i_D is directly proportional to the concentration of Cd(Ⅱ) from 0.01～1.5μmol·L^(-1). The limit of detection is 5.0 nmol·L^(-1). By using equimolar series method, the composition of the complex and the conditional stability constant determined to be 1:2 and 6.1×10^(11), respectively. The electrode reaction mechanism for the complex is studied by using linear sweep and cyclic voltammetry, NPP etc., and which indicates the reversible electrode process with an adsorption.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
1992年第4期527-533,共7页
Journal of Beijing Normal University(Natural Science)
基金
Project Supported by NSFC and Foundation of Lab of Electroanalytical Chemistry
Changchun Institute of Applied Chemistry
Acedemia Sinica
关键词
络合吸附波
镉
铜铁试剂
adsorptive complex wave
cadmium
cupferron
