Metrohm 797 VA Computrace - Manual (Page 173)

6.2 Calibration techniques with CVS and CPVS
797 VA Computrace – Software
161
VA measurement modes. The parameters displayed depend on the
measurement mode selected in the
WORKING METHOD SPECIFICA-
TIONS window. With “LAT Standard addition for brighteners” fol-
lowing parameters have to be defined:
Initial mixing time (s) [ 0...80600 s ; 10 s ] (see Initial mixing time
with CVS and CPVS , section 6.3)
Time of mixing before the first measurement of
the sample solution.
Conditioning Cycles (see Conditioning cycles with CVS and CPVS ,
section 6.3)
Start potential (V) [ -5...+5 V ; 0.2 V ]
Start voltage for the cyclic conditioning sweep.
End potential (V) [ -5...+5 V ; 1.625 V ]
Final voltage for the cyclic conditioning sweep.
No. of cycles [ 0...X ; 0 ]
Number of conditioning cycles.
Pretreatment (see Pretreatment with CVS and CPVS , section 6.3)
Cleaning potential (V) [ -5...+5 V ; 1.625 V ]
Voltage applied to the electrodes during the
Cleaning time .
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 Equi-
libration potential applied to the electrodes. If the
checkbox Hydrodynamic (measurement) is not che-
cked, 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”
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 eva-
luation and results calculation. The parameters displayed depend
on the
Calibration technique selected in the WORKING METHOD