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An Oxygen Sensor Based on Ru(bpy)2+3/Agar Gel Modified Electrode for the Determination Dissolved Oxygen in Organic Solvents

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A novel oxygen sensor was fabricated and applied as a sensor for dissolved oxygen in some organic solvents. The sensor, based on the use of Tris(2, 2′-bipyridine) ruthenium(III)/agar (Ru(bpy)2+3/agar) gel modified electrode, showed an ECL (Electrogenerated chemiluminescence or Electrochemi-luminescence) response to oxygen in organic solvent. Detection experiments using this sensor were conducted with toluene, xylene, ethanol, butanol, and dibutyl ester, and we found that the Ru(bpy)2+3/agar gel system had good stability and electrochemical activity. The ECL intensity was linear with the concentrations of oxygen from 0 to 100% (O2/N2 v/v) in toluene and xylene, the correlation coefficient were 0.9950 with a RSD of 0.033 (n = 10) and 0.9943 with a RSD of 0.026 (n = 10), respectively. The sensor possessed stability and precision for oxygen determination. We also discussed the ECL of Ru(bpy)2+3/agar in ethanol, butanol, and dibutyl ester. In ethanol, butanol, and dibutyl ester, the correlation coefficient of ECL intensity with the concentrations of oxygen was below 0.99 when the concentration is varied from 0 to 50% (O2/N2 v/v). This work provided a new way for immobilizated Ru(bpy)2+3 and the application of detection oxygen in organic solution. Our work shows the new sensor had satisfying response characters to the dissolved oxygen in toluene and xylene, and the ECL intensity presented total oxygen concentration. Furthermore it had response when the concentration of the oxygen was low in dibutyl ester.


Document Type: Short Communication


Publication date: December 1, 2006

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