Metrohm VoltIC pro I - Manual (Page 14)

Application Bulletin 356
Installation instruction for «VoltIC pro I»
Page 14 of 18
3.6 Starting a determination
The hyphenated analysis of IC and VA follows the cycle
described below:
All sample information (sample ID, dilution factor, etc…) is
programmed in MagIC Net
TM
.
MagIC Net TM triggers VA Computrace software by remote
signal.
VA Computrace software will feeds back information to
MagIC Net
TM
after preparing the measuring cell (before
sample transfer) and after VA analysis has been finished
and the cell has been prepared for the next analysis.
Please follow the steps below for system startup:

Close all applications

Turn on all instruments (843 Pump Station should be
switched on after the 797 VA Computrace, otherwise
pumps start pumping)

Start MagIC Net
TM
and check if all hardware
components have been recognized and available in the
configuration window.

Load method «VoltICpro.imet» in MagIC Net
TM

Start VA Computrace and check if hardware
components have been recognized

Load «Det of Zn Cd Pb Cu_IC_VA.mth» in VA
Computrace software

Under «Settings»  «General Settings» 
«Automation» activate «Remote Start» and «End of
Sample» and click «OK» (This must be done with
every restart of VA Computrace software as these
settings are not saved!)

Prepare both systems:
Ion chromatograph
o Equilibrate the system («Start HW»)
o Check for stable system pressure (+/- 0.1
MPa) on both channels; remove air bubbles
manually if necessary
o Check for stable baselines (anion channel:
~0.9 µS/cm, cation channel: ~680 µS/cm for
the mentioned eluents, refer 2.2)
VA
o Check working electrode and reference
electrode; refill if necessary
o Check nitrogen pressure, performance of
working electrode (create new drops)
o Perform electrode check

Start the VA method (VA will wait for trigger signal from
MagIC Net
TM
)

Enter the amount of standards and standard
concentrations in MagIC Net TM

Enter sample table in MagIC Net
TM
For quantitative analysis, samples subjected to cation
analysis are normally acidified, whereas anion analysis is
normally carried out with unmodified samples. Method
«VoltICpro.imet» includes only one sample for anion, cation
and heavy metal analysis. Method «VoltICpro_mod.imet»
includes 2 sample vials on the rack for each sample (an
unmodified one for anion determination and an acidified one
for cation and heavy metal determination). According to the
method «VoltICpro_mod.imet» the position of the vial for
anion determination should be defined in the column
«sample position» and the position of the vial for cation and
heavy metal determination is the subsequent one.
Both methods «VoltICpro.imet» and «VoltICpro_mod.imet»
include variable sample volume for VA analysis (0.2 mL –
10 mL). The desired sample volume is entered as «Value 1»
(see sample table below).
As the VA Computrace software calculates with a fixed
sample volume of 10 mL, the difference to 10 mL is dosed
by the optional Dosino (ultrapure water) directly into the VA
vessel.