Electrochemical flow sensor for in-situ monitoring of total metal concentrations

Joseph Wang, B. Tian, Jianyang Wang
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引用次数: 13

Abstract

An electrochemically-based submersible probe for in-situ monitoring of the total content of dissolved metal species is described. The flow-through sensor relies on the coupling of an internal on-line acidification of the collected samples with potentiometric stripping detection of the metals released from their complexes. The optimisation and characterisation of the new remote sensor have been carried out with trace measurements of cadmium and lead in the presence of EDTA and NTA. Elevated levels of these ligands (e.g. 0.05 and 1.0 mM EDTA and NTA, respectively) had no effect upon the cadmium and lead peaks, as compared to the complete disappearance of the response without the internal acid delivery. Such real-time measurements of the total form of dissolved heavy metals hold great promise for environmental and industrial monitoring. Other in-situ speciation sensing schemes are anticipated based on the versatility of the renewable-reagent flow probe.
用于现场监测总金属浓度的电化学流量传感器
介绍了一种用于现场监测溶解金属总含量的电化学潜水探针。流动传感器依赖于所收集样品的内部在线酸化与从其络合物中释放的金属的电位溶出检测的耦合。在EDTA和NTA存在的情况下,对镉和铅进行了痕量测量,并对新型遥感器进行了优化和表征。这些配体水平的升高(例如,EDTA和NTA分别为0.05和1.0 mM)对镉和铅峰没有影响,相比之下,没有内部酸输送的反应完全消失。这种对溶解重金属总形态的实时测量对环境和工业监测具有很大的前景。基于可再生试剂流动探针的多功能性,预计其他原位物种形成传感方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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