Neurauter, Gerhard and Klimant, Ingo and Wolfbeis, Otto S. (2000) Fiber-optic microsensor for high resolution pCO(2) sensing in marine environment. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 366 (5). pp. 481-487. ISSN 0937-0633
Full text not available from this repository.Abstract
A fast responding fiber-optic microsensor for sensing pCO(2) in marine sediments with high spatial resolution is presented. The tip diameter varies typically between 20 and 50 mu m. In order to make the pi-I-indicator 8-hydroxypyrene-1,3,6-trisulfonate soluble in the ethyl cellulose matrix, it was lipophilized with tetraoctylammonium as the counterion [HPTS-(TOA)(4)]. The microsensor was tuned to sense very low levels of dissolved carbon dioxide which are typically present in marine systems. The detection limit is 0.04 hPa pCO(2) which corresponds to 60 ppb CO2 of dissolved carbon dioxide. A soluble Teflon derivative with an extraordinarily high gas permeability was chosen as a protective coating to eliminate interferences by ionic species like chloride or pH. Response times of less than 1 min were observed. The performance of the new microsensor is described with respect to reproducibility of the calibration curves, dynamic range, temperature behavior, long term stability and storage stability. The effect of hydrogen sulfide as an interferent, which is frequently present in anaerobic sediment layers, was studied in detail.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CARBON-DIOXIDE; OXYGEN; MICROELECTRODE; SENSORS; PERFORMANCE; MICROSCALE; BIOFILMS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 May 2022 10:18 |
| Last Modified: | 31 May 2022 10:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42778 |
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