Metrohm 797 VA Computrace - Manual (Page 169)

6.2 Calibration techniques with CVS and CPVS
797 VA Computrace – Software
157
Cleaning time (s) [ 0...80600 s ; 0 s ]
Time during which the Cleaning potential is ap-
plied to the electrodes.
Equilibration potential (V) [ -5...+5 V ; 1.625 V ] (This pa-
rameter is with CPVS part of the sweep)
Voltage applied to the electrodes during the
Equilibration time .
Equilibration time (s) [ 0...80600 s ; 5 s ] (This parameter is
with CPVS part of the sweep)
Waiting time before starting the sweep; with
Equilibration potential applied to the electrodes. If
the checkbox Hydrodynamic (measurement) is not
checked, the stirrer is switched off during that
time.
Sweep
The sweep parameters depend on the mode (see
CVS - Cyclic Voltammetric Stripping section 3.2,
and CPVS - Cyclic Pulse Voltammetric Stripping
section 3.2)
Substances tab with Calibration technique “LAT Record
intercept value”
The Substances tab of the EDIT WORKING METHOD PARAMETERS
window contains parameters for the definition and recognition of
substances, for the definition of standard solutions, for peak evalu-
ation and results calculation. The parameters displayed depend on
the
Calibration technique selected in the WORKING METHOD SPE-
CIFICATIONS window. With “LAT Record intercept value” following
parameters have to be defined:
Substance [ 24 characters ; ]
Substance name. For the assignment of a found
peak to this substance the checkbox on the left
side of the substance name must be checked.
With CVS:
Peak pos. +/- (V) [ -5...+5 V ; 0 V ]
Position of the peak voltage for the substance and
tolerance for this verification voltage.
With CPVS:
Step potential [ read only ; step 1: 0.2 V ]
Displays the potential values, which are defined in
the window
edit stripping steps .
Bsln .
Parameters for baseline evaluation (details see
Baseline , section 5.2). Click the button to open
the BASELINE window for the selected substance.
Peak evaluation [ Height, Area, Derivative, Coulometric ; Coulomet-
ric ]
Selection of peak evaluation quantity:
Height
Peak height from baseline to peak maximum.