On-site analysis of arsenic in groundwater using a microfabricated gold ultramicroelectrode array
On-site analysis of arsenic in groundwater using a microfabricated gold ultramicroelectrode array
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DOI：
10.1021/ac991185z
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发表时间：
2000-05-15
影响因子：
7.4
通讯作者：
Kounaves, SP
中科院分区：
文献类型：
--
作者：
Feeney, R;Kounaves, SP
利用一个小型电池供电装置和一个微制金超微电极阵列(Au-UMEA)，实现了地下水中砷的现场快速分析。用方波阳极溶出伏安法研究了该传感器对低ppb As~(3+)的高灵敏度，研究了方波频率、脉冲幅度和沉积电位对砷的峰溶出电流的影响，改变这些理论参数，得到了与薄膜情况惊人地相似的结果。对Au-UMEA的性能进行了重复性和可靠性评估。三次稳定性试验表明，连续15次的平均相对标准偏差为2.5%。考察了检出限，在S/N为3：1的条件下，可测得0.05 ppb的As~(3+)。干扰研究是在50-500 ppb的Cu2+、Hg2+和Pb2+存在的情况下进行的。使用小型电池供电的恒电位仪对含砷地下水进行了现场分析。通过标准添加进行量化，并将这些结果与标准的EPA方法进行比较。
Rapid on-site analysis of arsenic in groundwater was achieved with a small battery-powered unit in conjunction with a microfabricated gold ultramicroelectrode array (Au-UMEA). The sensor, consisting of 564 UME disks with a unique gold surface created by electron beam evaporation, was demonstrated to be highly sensitive to low-ppb As3+ using square wave anodic stripping voltammetry, The influence of the square wave frequency, pulse amplitude, and deposition potential on the arsenic peak stripping current was investigated, Varying those theoretical parameters yielded results surprisingly similar to those for the thin Hg film case. The performance of the Au-UMEA was evaluated for reproducibility and reliability. Three stability tests showed an average relative standard deviation of 2.5% for 15 consecutive runs. Limits of detection were investigated, and 0.05 ppb As3+ could be measured while maintaining a S/N of 3:1. Interference studies were performed in the presence of 50-500 ppb of Cu2+, Hg2+, and Pb2+. On-site analysis of groundwater containing arsenic was performed with a small battery-powered potentiostat. Quantification was done through standard additions, and these results were compared to the standard EPA methodology.