Metrohm 757 VA Computrace - Manual (Page 45)

3.2 VA measurement modes
757 VA Computrace – Software
35
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
determination mode by selecting
DC - Sampled direct current for
the Mode parameter in the EXPLORATORY SPECIFICATION or
WORKING METHOD SPECIFICATIONS window.
Description:
For DC voltammetry, the direct voltage applied to the working
electrode 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)