摘要
用电化学方法和扫描电镜对沉积晶体图象的观察,剖析了碳纤维微电极上汞膜的形成过程,提出了优化汞膜的实验条件;导出了碳纤维微汞膜电极上单扫描溶出电流方程式。通过搅拌和支持电解质对溶出峰电流影响的研究,提出了一个简化的分析手续,开发了CFME在ASV中的应用,Cu^(2+),Pb^(2+),In^(3+)和Cd^(2+)同时测定的检测限达3.0,0.6,1.2和0.5ppb,Zn^(2+)的检出限为1.3ppb。
In this paper, the forming processes of mercury film on CFME are studied. By means of thescanning electron microscope, the mercury crystal pattern is observed. The optimun experimentalconditions for the formation of mercury are recommended. The single sweep anodic stripping cu-rrent equation for the carbon fiber microdisc mercury film electrode is presented. The applicationof CFME to ASV is further developed for the simultaneous trace determinations of Cu^(2+), Pb^(2+),In^(3+) and Cd^(2+) with the detection limit of 3.0, 0.6, 1.2 and 0.5ppb, respectively, the detectionlimit of Zn^(2+) is about 1.3ppb. Passing through the study of the effects of stirring and supportingelectrolyte concentration on stripping eak current, a simple procedure is proposed. It is of im-portant significance for the trace analysis in particular case.
基金
国家自然科学基金
中科院长春应化所电化学分析开放研究室资助
关键词
碳纤维
微电极
汞膜电极
Carbon fiber microelectrode
anodic stripping voltammetry
edge-effect
mercury-film electrode
