College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
Talanta. 2010 Mar 15;80(5):1959-63. doi: 10.1016/j.talanta.2009.10.054. Epub 2009 Nov 4.
This work exploited a sequential injection lab-on-valve (LOV) system for the determination of cadmium by anodic stripping voltammetry (ASV). A miniaturized electrochemical flow cell (EFC) was fabricated in LOV, in which a nafion coated bismuth film electrode was used as working electrode. The cadmium was electrodeposited on the electrode surface in bismuth solution, and measured with the subsequential stripping scan. Under optimal conditions, the proposed system responded linearly to cadmium concentrations in a range 2.0-100.0 microg L(-1). The detection limit of this method was found to be 0.88 microg L(-1). By loading a sample volume of 800 microL, a sampling frequency of 22 determinations h(-1) was achieved. The repeatability expressed as relative standard derivation (R.S.D.) was 3.65% for 20 microg L(-1) cadmium (n=11). The established method was applied to analysis of trace cadmium in environmental water samples and the spiked recoveries were satisfactory.
本工作利用基于顺序注射的阀上实验室（LOV）系统，通过阳极溶出伏安法（ASV）测定镉。在 LOV 中制造了一个微型电化学流动池（EFC），其中使用涂覆有全氟磺酸的铋膜电极作为工作电极。将镉在铋溶液中电沉积在电极表面上，然后进行随后的溶出扫描测量。在最佳条件下，该系统对 2.0-100.0μg L（-1）范围内的镉浓度呈线性响应。该方法的检测限为 0.88μg L（-1）。通过加载 800μL 的样品体积，可实现 22 次测定 h（-1）的采样频率。对于 20μg L（-1）的镉（n=11），重复性表示为相对标准偏差（R.S.D.）为 3.65%。该方法已应用于环境水样中痕量镉的分析，加标回收率令人满意。
