Fibre-optic fluorosensor for sulphur dioxide |
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Authors: | Otto S Wolfbeis Ashutosh Sharma |
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Institution: | Analytical Division, Institute of Organic Chemistry, Karl-Franzens University, A-8010 Graz Austria |
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Abstract: | A fibre-optic sensor for continuous measurement of sulphur dioxide is described. It is based on the dynamic quenching of the fluorescence of a polynuclear aromatic hydrocarbon benzo(b)fluoranthene] which is immobilized in silicone polymer. Sulphur dioxide is shown to be an efficient quencher; Stern-Volmer graphs are given which describe the relation between SO2 concentration and relative fluorescence. Detection limits are about 0.01% (v/v) SO2 in air; the useful range is from 0.01–6% (v/v). Other gases likely to occur in air were found to be inert, except for oxygen which also acts as a dynamic quencher. Its interference is negligible for SO2 levels below 6% in air at constant oxygen pressure, because the quenching efficiency of SO2 is about 26 times higher than that of oxygen. For varying oxygen levels, a two-sensor technique is suggested. |
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