摘要
研究并提出在HNO_3-NaCl-硫脲(Tu)体系中,Nafion/玻碳(Gc)修饰电极阴极溶出伏安法测定痕量鉍的方法。表明Tu具络合协同作用,使Nation阳离子交换能力提高。本法检出限为5×10^(-9)mol/L Bi^(3+)(td:5min),电极表面易于再生,文中研究了电极过程机理,计算得[Bi(Tu)_6]^(3+)在Nafion膜中的分配系数(K_D),扩散系数(D)和选择性系数(K_H~[Bi(Tu)_6^+]^(3+))分别为7.57×10~5,5.9×10^(-11)cm^2/s及3.39。
A cathodic stripping voltammetric method for the determination of trace bismuth with Nafion/ glassy carbon modified electrode has been studied. The result demonstrates that thiourea has an effect of complex association on increasing the ability for cation exchange of Nafion film. In this way, the detection limit is 5×10-3mol/L for Bi3+(td:5min) and the electrode surface is-easily renewed. The mechanism of the electrode process is investigated and the distribution coefficient(KD) ,the diffusion coefficient(D) and the selectivity coefficient (KH[Ri(Tu)6]3+) in Nafion film were calculated to be 7. 57×105,5. 9×10-11cm2/s and 3. 39,respectively.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期405-409,共5页
Chinese Journal of Analytical Chemistry
关键词
化学修饰电极
阴极溶出
伏安法
铋
Nafion film,Chemically modified electrode,Cathodic stripping voltarometry,Bismuth.