Assessment of an ultramicroelectrode array UMEA) sensor for by Xudong Xie

By Xudong Xie

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Assessment of an ultramicroelectrode array UMEA) sensor for the determination of trace concentrations of heavy metals in water

Bestellen Sie jetzt und wir liefern, sobald der Artikel verfügbar ist. Sie erhalten von uns eine email mit dem voraussichtlichen Lieferdatum, sobald uns diese info vorliegt. Ihr Konto wird erst dann belastet, wenn wir den Artikel verschicken.

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1 Ir UMEAs The cyclic voltammetric behavior of the newly developed iridium UMEAs is shown in figure 18. Scan rates of cyclic voltammetry vary from 5 mV/s to 30 V/s. , 5 mV/s and 10 mV/s, 20 mV/s, 50 mV) the UMEAs display a slight peak shaped cyclic voltammogram, which is indicative of the transition of the mass transport from radial diffusion to linear diffusion (SANDISON 41 6. Analytical Performance of Ultramicroelectrode Arrays ET AL. 2002). The slight decrease in measurement currents observed at a scan rate of 5 mV/s provides an evidence of the onset of linear diffusion.

Cottrell state, and steady- and quasi-steady state. 03 s (Fig. 22a and appendix 4), which is proved by the current decay with the reciprocal of the square root of time (t-1/2) (Fig. 22b) (ANDREWS & HARRIS 1998). After approximate 10 s the current falls to a constant value, suggesting that the steady state was attained (Fig. 0E-06 Current (A) Current (A) 6. 04 t-1/2 (s) (f) Fig. 22: Plots of the chronoamperometric response of Ir-UMEA, (a) current vs. t in 1 s; (b) current vs. t-1/2 in 1 s; (c) current vs.

Theory Cyclic voltammetry is mainly used for studying dynamic electrochemistry, such as thermodynamics and kinetics of electron transfer (HEINZE 1984, GOSSER 1993). For a reversible reaction system and a macroelectrode, the following information can be obtained from a cyclic voltammogram (Tab. 1) (MONK 2001). Tab. 314 J K-1 mol-1) T = temperature (Kelvin) For microelectrodes, a sigmoidal cyclic voltammogram is observed at a certain timescale, because the mass transport is dominated by radial diffusion.

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