Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 86, Issue -, Pages 94-98Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2017.11.021
Keywords
Heavy metals; Electrochemical analysis; Electrode size; Dielectrophoretic effect; Water pollution; Electro-optics
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Electrochemical sensors can be used to create portable, attractive, high-sensitivity devices to detect heavy ions in water at a reasonable cost. A novel method of measuring local redox on an electrode using the differential reflectivity measured on an approximately 6 micron diameter spot using a He/Ne laser beam is described. Field focusing and electrode modification enhance the sensitivity, making the method ideal for miniaturization and multiplexing multiple analytes on a monolith electrode. The method is demonstrated by detecting Pb, Hg, and As ions at ppb and ppt levels.
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