Metrohm 788 IC Filtration Sample Processor - Manual (Page 112)

4 Operation
788 IC Filtration Sample Processor
104
4.6.5 Method "Preconc"
Application
Preconcentration of samples with very low concentrations in an precon-
centration column (trace analysis). This method is not planned for us-
age together with the ultra-filtration cell. However, if ultra-filtration is
done, the preconcentration time in line 8 has to be increased to main-
tain a sufficient filtering time, but without complete consuming of the
sample solution.
Interconnection
Siehe section. 2.6.3.
Installation of the preconcentration column
The preconcentration column, either consisting of the 6.1006.200 Met-
rosep Anion preconcentration cartridge and the 6.2828.010 glass car-
tridge holder or the 6.1006.300 preconcentration column, is installed at
the injection valve of the 733 IC Separation Center instead of the sam-
ple loop (see Fig. 25). It is important to install the sample inlet from the
788 IC Filtration Sample Processor at connection 2 of the injection valve
in order to run the preconcentration column for the enrichment and the
sample injection in the opposite direction.
1 2
4 5
3 6
1 2
4 5
3 6
Fig. 25: Installation of the preconcentration column
Waste Sample Sample Waste
Sample injection Preconcentration
IC column
Preconc. column
Eluent IC column Eluent