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| - Hydrodynamic Modulation Voltammetry with anOscillating Microjet Electrode
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| - A new method of hydrodynamic modulation voltammetry(HMV) is introduced, based on the microjet electrode(MJE) with an oscillating nozzle position. In MJE-HMV ajet of solution is fired at high velocities from a nozzle (witha typical diameter in the range 25−50 μm) onto thesurface of a disk ultramicroelectrode (UME). The masstransport rate to the electrode is modulated by oscillatingthe lateral position of the jet between two differentcoordinates: one where the jet impinges directly on theelectrode surface and the other where the flowing stream(largely) misses the electrode. The resulting modulated(transport-limited) current in phase with the moving jetis quantitative and discriminates effectively against background processes. Studies of iridium (III) hexachloride(IrCl63-) oxidation at a Pt MJE serve to demonstrate thegeneral capabilities of the technique. For this system,detection limits are estimated to be ∼5 × 10-9 mol dm-3.In its present form, modulation frequencies of as muchas 20 Hz can be successfully employed without seriousattenuation of the current signal, and there is scope forfurther improvement through the use of smaller nozzlesand electrodes and piezoelectric positioners with improved frequency responses.
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