Spectroelectrochemical Sensor: Development and Applications
This paper is being submitted to the 215th ECS (Electrochemical Society) Meeting, San Francisco, California | May 24-29, 2009 The spectroelectrochemical sensor concept uses electrochemistry to modulate an optical signal to give improved selectivity. The sensor consists of an optically transparent electrode/waveguide coated with a thin film that preconcentrates the analyte. The sensor concept was first demonstrated with ferricyanide and later it was shown to work on a complex sample by detecting ferrocycanide in radioactive Hanford tank waste. Nafion, partially sulfonated polystyrene-block-polyethylene-ran-butylene)block-polystyrene (SSEBS), and quaternized poly(vinylpyridine) (QPVP) are examples of polymers used for the thin film. Detection limits achieved by the sensor are 10-5 to 10-8 M using change in absorbance as the mode of detection and about 10-10 M using fluorescence. A sensor has been developed for detection of [Re(dmpe)3]+ where dmpe = dimethylphosphinoethane, which serves as a nonradioactive analogue for complexes of radioactive 99Tc. Some polycyclic aromatic hydrocarbons have appropriate electrochemical and spectroscopic properties for spectroelectrochemical detection as demonstrated for 1-hydroxypyrene and its conjugate 1-hydroxypyrene-glucuronide.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1013950
- Report Number(s):
- PNNL-SA-65142; KP1504010; TRN: US1102535
- Resource Relation:
- Conference: 215th ECS Meeting: 35 Years of Chemical Sensors - An Honorary Symposium for Professor Jiri Janata's 70th Birthday Celebration, May 24-29, 2009, San Francisco, CA: ECS Transactions, 19(6):129-134
- Country of Publication:
- United States
- Language:
- English
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