Metrohm 797 VA Computrace - Manual (Page 74)

3 General settings for exploratory and determination mode
797 VA Computrace – Software
62
Time of inert gas purging before the first measurement of the
sample solution.
Conditioning of solid state electrodes
Solid state electrodes (particularly carbon electrodes) can be elec-
trochemically regenerated by a freely selectable number of condi-
tioning cycles. For every cycle, the voltage is changed at a sweep
rate of 1 V/s to the
end potential and then decreased at the same
rate back to the start potential .
Start potential (V) [ -5...+5 V ; -1.2 V ]
Start voltage for the cyclic conditioning sweep.
End potential (V) [ -5...+5 V ; -0.1 V ]
Final voltage for the cyclic conditioning sweep.
No. of cycles [ 0...X ; 0 ]
Number of conditioning cycles.
Note: With the electroplating bath modes different default values
are set (see section 6.3 Conditioning cycles with CVS and CPVS)
Pretreatment
The pretreatment of the electrode before starting a sweep can con-
sist of the following three steps:
• The cleaning potential can be used to clean solid state
electrodes with a stationary surface which are contaminated
with the products of the electrode redox processes.
• The deposition potential is used for electrochemical en-
richment in stripping voltammetry.
• During the
Equilibration time , the start potential of the
sweep is applied to the electrode.