Spectroelectrochemical Sensing Based on Attenuated Total Internal Reflectance Stripping Voltammetry. 1. Determination of Lead and Cadmium

• Published in: Analytical chemistry (Washington) Vol. 75; no. 17; pp. 4585 - 4590
• Main Authors: Shtoyko, Tanya, Maghasi, Anne T, Richardson, John N, Seliskar, Carl J, Heineman, William R
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.09.2003
• Subjects: Analytical chemistry; Biochemistry; Chemistry; Electrochemical methods; Exact sciences and technology; General, instrumentation; Sensors; Spectrometric and optical methods; Performance evaluation; Indium oxide; Electrochemical detector; Optically transparent electrode; Cyclic voltammetry; Absorption spectrometry; Lead II; Total attenuated reflection; Cadmium II; Tin oxide; Standard curve; Electrodeposition; Spectroelectrochemistry
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac034281f

The electrodeposition and subsequent stripping of lead and cadmium on an indium tin oxide (ITO) optically transparent electrode (OTE) were monitored by attenuated total internal reflectance. Light passing through the ITO-OTE is attenuated proportionally to the concentration of metal ion and deposition time. The wavelength dependence of the optical responses of deposited Pb and Cd was determined; optimal performance based on maximum sensor absorbance was at 750 nm for Pb and at 400 nm for Cd. Calibration curves were obtained over a range of 5 × 10-8 to 5 × 10-5 M and 1 × 10-9 to 1 × 10-5 M for Pb and Cd, respectively, using change in absorbance that accompanied deposition and subsequent stripping of the electrodeposited metal from the ITO.