Stangelmayer, Achim and Klimant, Ingo and Wolfbeis, Otto S. (1998) Optical sensors for dissolved sulfur dioxide. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 362 (1). pp. 73-76. ISSN 0937-0633
Full text not available from this repository.Abstract
Colorimetric sensing membranes for the determination of sulfur dioxide were developed and characterized. These films can be used for sensing trace amounts of sulfur dioxide both in the gas phase and in aqueous solutions. Lipophilic pH indicator ion pairs were immobilized in hydrophobic gas-permeable silicone and phenyl substituted ormosil. On exposure to SO2 the films undergo a visually detectable color change from blue to yellow. No cross-sensitivity to pH and CO2 was observed. Response times depend on the thickness of the sensing membranes, the indicator concentration in the film as well as on the respective SO2 concentration. Membranes with response times of < 1 min (t(90)) were developed. The sensitivity to sulfur dioxide depends on the pK(a) of the indicator. An increase in the pK(a) results in a lower detection Limit. The new optical SO2 sensors are chemically and mechanically stable and are easy to manufacture. The storage stability of the membranes is at least 7 months if stored in the dark.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SULFITE; ION; AIR; ELECTRODE |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2023 09:37 |
| Last Modified: | 16 Feb 2023 09:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49548 |
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