铅镉重金属离子在铋膜电极上的相互影响  

Mutual Influence of Lead and Cadmium Ions on Bismuth Film Electrode

作　　者：韩彦超[1] 卫婷[2] 李敬[1] 贾小芳[1,3] 李冬月[1,3] 张晓伟[1,3] 汪尔康[1] 

机构地区：[1]中国科学院长春应用化学研究所电分析化学国家重点实验室,长春130022 [2]长春工程学院,长春130061 [3]中国科学院研究生院,北京100039

出　　处：《分析化学》2014年第10期1539-1543,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.21105094);863计划(No.2013AA065601);吉林省青年基金项目(20130522130JH)资助~~

摘　　要：采用原位镀铋电极的方式,以玻碳电极为工作电极,通过改变Cd2＋和Pb2＋的比例,考察不同Pb2＋和Cd2＋浓度条件下,两者同时存在时的相互影响。实验发现,Cd2＋和Pb2＋同时存在时,存在相互的影响,特别是对于Cd2＋的检测,由于Pb2＋较正的析出电位,对于Cd2＋的析出有一定的辅助作用。考察了Cd2＋和Pb2＋单独存在时的分析性能, Pb2＋沉积时间为60 s时,在1～80μg/L范围内呈线性关系,检出限为0.5μg/L；Cd2＋的沉积时间为120 s,在1～25μg/L和30～200μg/L范围内有良好的线性关系,检出限为1.0μg/L。考察了铋膜电极在不同实际水样中对Pb2＋和Cd2＋的分析,获得了较好的一致性。The mutual influence of lead and cadmium ions on “in-situ” bismuth film coated glassy carbon electrode was demonstrated using different concentration target ions by changing ratio between Pb2＋ and Cd2＋. It is found that the presence of coexisting ions can have an influence on the detection of target ions. Especially for the detection of Cd2＋, the existence of Pb2＋ can be beneficial for the deposition of Cd due to the more positive deposition potentials. And the analytical performances of Cd2＋and Pb2＋ were obtained. The detection limit is 0. 5 μg/L towards Pb2＋ with a linear range from 1-80 μg/L using 60 s deposition time. The resulting calibration plots of Cd2＋ are linear over the range from 1-25 and 30-200 μg/L with the detection limit of 1 μg/L using 120 s deposition time. The bismuth film was finally employed to determine the Pb2＋and Cd2＋in real sample with good satisfied results.

关 键 词：铅 镉 铋膜电极 溶出伏安 相互干扰 

分 类 号：O646.54[理学—物理化学]