Metrohm 797 VA Computrace - Manual (Page 56)

3 General settings for exploratory and determination mode
797 VA Computrace – Software
44
DC – Sampled Direct Current
General:
DC or Sampled Direct Current voltammetry is the classic,
simplest voltammetric measurement mode with limited sensitivity.
It is mainly used for the investigation of reversible redox systems.
The DC measurement mode can be set for the exploratory and de-
termination mode by selecting
DC - Sampled direct current for the
Mode parameter in the EXPLORATORY SPECIFICATION or WOR-
KING METHOD SPECIFICATIONS window.
Description:
For DC voltammetry, the direct voltage applied to the working elec-
trode is continuously changed and the resultant current i which
flows measured as a function of the voltage U. For DME and SMDE
this normally provides wave-shaped curves which can be evaluated
in the exploratory mode using the tangent method.
U
t
t (i)
Start potential
Voltage step
Voltage step time
Half-wave voltage
Wave current
i
U
t (i)