Electrochemical detection of trace concentrations of cadmium and lead with a boron-doped diamond electrode:: Effect of KCl and KNO3 electrolytes, interferences and measurement in river water
Electrochemical detection of trace concentrations of cadmium and lead with a boron-doped diamond electrode:: Effect of KCl and KNO3 electrolytes, interferences and measurement in river water
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DOI：
10.1002/elan.200302794
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发表时间：
2004-02-01
期刊：
影响因子：
3
通讯作者：
Smart, RR
中科院分区：
文献类型：
--
作者：
Babyak, C;Smart, RR
十亿分之几的镉和铅的水平，使用方波阳极溶出伏安法与硼掺杂的金刚石电极检测。KCl和KNO 3中的校准曲线（10分钟沉积时间）在低浓度（1-5 ppb）下是非线性的，这是由于这些金属的沉积机制。镉的优选电解质是KCl，而铅可以在任一电解质中测量。校准曲线线性部分（5分钟沉积时间）中镉的最低浓度分别为KCl和KNO 3中的10 ppb和50 ppb，KNO 3中铅的最低浓度为10 ppb。铅或铜的存在抑制镉的溶出峰，但铅的溶出峰不受镉的影响，并通过添加铜增强。对某河流水样进行了镉和铅的分析，镉的分析结果用电感耦合等离子体原子发射光谱法进行了确认。电化学测定表明，河流样品中的一部分铅与样品中的络合物结合。
Parts-per-billion levels of cadmium and lead were detected using square-wave anodic stripping voltammetry with a boron-doped diamond electrode. Calibration plots (10-minute deposition time) in KCl and KNO3 were non-linear at low concentrations (1-5 ppb) due to the deposition mechanism of these metals. The preferred electrolyte for cadmium was KCl, while lead could be measured in either electrolyte. The lowest concentrations included in the linear portion of the calibration plot (5 minute deposition time) for cadmium were 10 ppb and 50 ppb in KCl and KNO3, respectively, and 10 ppb for lead in KNO3. The presence of either lead or copper suppressed the cadmium stripping peak, but the lead stripping peak was unaffected by cadmium, and enhanced by the addition of copper. A river water sample was analyzed for cadmium and lead, and the cadmium results were confirmed using ICP-AES spectrometry. It was determined electrochemically that a fraction of lead in the river sample was bound by complexing material in the sample.