Metrohm 797 VA Computrace - Manual (Page 201)

6.3 Different settings and options with CVS and CPVS
797 VA Computrace – Software
189
• Determination parameters on the
Determination tab of the EDIT
WORKING METHOD PARAMETERS window are different (see
Determination for other modes section 5.2, and check the pa-
rameters for the Calibration technique you are using Calibration
techniques with CVS and CPVS, section 6.2)
• Different
Technique options ( Batch with solution exchange is not
applicable with CVS and CPVS, see also Working method speci-
fications window section 5.2)
• With CVS and CPVS, the RDE/SSE electrodes are used (see CVS -
Cyclic Voltammetric Stripping section 3.2, and CPVS - Cyclic
Pulse Voltammetric Stripping , section 3.2)
• Substances parameters on the
Substances tab of the EDIT WOR-
KING METHOD PARAMETERS window settings are different (see
Substances for other modes section 5.2, and under the Ca-
libration technique you are using Calibration techniques with
CVS and CPVS, section 6.2)
• Some result details are different (see
• Note: If both No. of
conditioning measurements [ 1...100 ; 1 ]
and Auto Std.dev (%) [ >0.1 ; 1 ] are activated, the conditioning
is finished as soon as the first of the two criterias is reached.
Additional conditioning after sample transfer (only active with
MLAT and RC Sample with response curve , and if
Initial electrode conditioning is activated)
If this option is activated, an additional electrode
conditioning is started after sample addition. This
option can only be activated, if Initial electrode
conditioning is activated.
• Result details with CVS and CPVS section 6.3, and Results sec-
tion 5.5)
Pretreatment with CVS and CPVS
There is no deposition possible with CVS and CPVS. For the equi-
libration you can choose a specific
Equilibration potential , which is
positive enough to prevent metal deposition on the electrode (with
the other modes, the
Start potential is taken as Equilibration poten-
tial , See Pretreatment for other modes section 3.4 ).
Initial mixing time with CVS and CPVS
With CVS and CPVS, there is no “Initial purge time” (see Purging
section 3.4 ), since purging is not necessary (Reasons: solid state
electrode is less sensitive against oxygen interferences; measuring
at higher current; measuring in the positive voltage range). There is
an “Initial mixing time” instead.
In the exploratory mode, you can find this field in the
EXPLORA-
TORY SPECIFICATION window. In the determination mode, you can