Mohr, Gerhard J. and Wolfbeis, Otto S. (1996) Optical nitrite sensor based on a potential-sensitive dye and a nitrite-selective carrier. ANALYST, 121 (10). pp. 1489-1494. ISSN 0003-2654, 1364-5528
Full text not available from this repository.Abstract
A membrane responsive to nitrite has been developed which is composed of plasticized PVC, the anion carrier benzylbis(triphenylphosphine) palladium(II)chloride, and the potential-sensitive dye (PSD) rhodamine B octadecyl ester perchlorate, On exposure to nitrite, fluorescence intensity increases, while the wavelengths of both the excitation and emission maxima remain unchanged, The sensor membrane exhibits its highest sensitivity to nitrite in the 5 to 5000 mg l(-1) range, and the detection limit is 0.5 mg l(-1). The signal change on exposure to 100 mmol l(-1) nitrite is as high as +95%. The effect of pH is significant: from pH 5.0 to pH 9.0 and in the absence of nitrite, the fluorescence intensity changes almost linearly by around -9% per pH unit, In addition, the sensor is cross-sensitive to pH: the relative signal change from plain buffer to 1 mmol l(-1) nitrite is smaller by 65% at pH 9.0 than at pH 5.0, The selectivity coefficients relative to nitrite were determined by the separate solution method at pH 7.13 and were found to be 8 x 10(-3) for nitrate, 1.6 x 10(-3) for chloride, 8 x 10(-4) for hydrogencarbonate, and 3 x 10(-4) for sulfate, The lifetime of the sensor membrane is limited by leaching of the PSD, which is in the range of 13% h(-1).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTOLUMINESCENT PROPERTIES; OCTADECYLRHODAMINE-B; CHEMICAL SENSORS; MEMBRANE; ELECTRODES; NITRATE; WATER; optode; nitrite sensor; anion sensor; fluorescence; polarity probe |
| 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: | 22 Jun 2023 09:08 |
| Last Modified: | 22 Jun 2023 09:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51427 |
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