Journal of the American Chemical Society · 2003 · 56 citations · 8 references
Natural SciencesBiochemistryChemistryAnalytical ChemistryChemical KineticsSpectroscopyFluorescence SpectroscopyLaser SpectroscopyOptical SpectroscopyOxidation ReactionsPhotochemical KineticsPhotochemistryCavity Ring-down SpectroscopyDissolved OxygenOxygen Reduction Reaction KineticsPhotochemical Reaction KineticsPigment ReductionReduction KineticsSpectroscopic Kinetics
The kinetics of methylene blue reduction by ascorbic acid in acetonitrile was investigated by cavity ring-down spectroscopy. Because of our high sensitivity we were able to use very low concentrations (1-10 nM) of the dye. Under these conditions, we observed a second-order loss of dye as well as a competing back reaction with dissolved oxygen. The use of an inexpensive diode laser and a relatively simple setup should make ultratrace kinetic studies more accessible.
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