Metrohm 757 VA Computrace Manual de usuario descargar pdf (Pagina 49)

3.2 VA measurement modes

757 VA Computrace – Software

CV – Cyclic Voltammetry

General:

CV or Cyclic voltammetry is mainly used to investigate the re-

versibility of electrode processes and for kinetic studies. The CV

measurement mode can be set for the exploratory and determi-

nation mode by selecting

CV - Cyclic voltammetry

for the

Mode

pa-

rameter in the

EXPLORATORY SPECIFICATION

WORKING

METHOD SPECIFICATIONS

window.

Description:

For cyclic voltammetry, the voltage is once or several times

changed at a rapid but constant sweep rate to the end potential

and then decreased at the same rate back to the start potential.

The current i is measured as a function of the voltage U. The

curve registered in the last cycle is stored and its peaks can be

evaluated using linear, polynomial or exponential baselines.

cath

Start potential

Voltage step

Voltage

step time

End potential

t (

)

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 197 198

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Metrohm 757 VA Computrace Manual de usuario Pagina 49