| Summary: | 碩士 === 國立中興大學 === 化學系 === 92 === Mixed valence ruthenium oxide-ruthenium cyanide (mvRuOx-RuCN) - modified screen-printed electrode (mvRuOx-SPE) was used for sensitive detection of alcohols and aldehydes by flow injection analysis (FIA). Cyclic voltammetric studies with the bare mvRuOx-SPE films show obvious redox peak at ~1.10 V vs. Ag/AgCl, which can help in mediating the alcohols and aldehydes oxidation reaction. Optimized FIA conditions of applied potential = 1.10 V and flow rate = 0.2 mL/min are used for detection of ethanol in 0.01 M H2SO4 solution. Linear detecting range of 10 μM ~ 10 mM, r =0.9994 for ethanol and 10 μM ~ 5 mM, r = 0.9987 for formaldehyde were obtained. The detection limits (S/N = 3) are 5 μM for both analytes. Repeated injection of ethanol up to 24 h didn’t show any variation in the detection signals. The electrodes can be easily extended into practical applications. In HPLC system, we combine ORH-801 analytical column to separate the standard solutions of glucose, formaldehyde, methanol and ethanol. We choose Taiwan beer, whiskey, rice wine and red wine for real samples. This chemical modified electrode has the advantages of high stability, good sensitivity, cheap and easy in preparation. It can be combined with column for separation.
|
|---|
