A novel sensor that combines electrochemistry, spectroscopy, and selective partitioning into a film has been developed.  The sensor consists of an optically transparent electrode (OTE) coated with a selective film.  Sensing is based on the change in optical signal for attenuated total reflectance at the OTE that accompanies electrochemical modulation of analyte that has partitioned into the film.  Selectivity for the analyte relative to other solution components is obtained by choice of film material, electrolysis potential, and wavelength for optical monitoring. Detection by absorbance and fluorescence has been demonstrated. The sensor has selectivity and ruggedness for applications that involve complex samples in harsh environments such as the determination of ferrocyanide in nuclear waste. The sensor is also suitable for environmental applications such as detecting metal ions in subsurface water at the Hanford Site.

Spectroelectrochemical sensor for detecting metal ions in harsh environments

245th National Meeting (2013)

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