Metrohm 872 Extension Module Suppression – MCS - Manual (Page 34)

3.7 Metrohm CO
2
Suppressor (MCS)
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
26 ￭￭￭￭￭￭￭￭
872 Extension Module Suppression – MCS
6 Connecting the regeneration solution outlet capillary
￭ Guide the other end of the outlet capillary labeled with waste reg.
into a sufficiently large waste container and fasten it there.
3.7 Metrohm CO
2
Suppressor (MCS)
3.7.1 General information on the MCS
The Metrohm CO
2
Suppressor (MCS) removes the CO
2
from the eluent
flow. This reduces the background conductivity, improves the detection
sensitivity and minimizes the injection and carbonate peaks.
CO
2
can reach the eluent flow through the sample itself or arise through
the suppression reaction in the MSM/. The CO
2
peak is effectively mini-
mized through connection of the MCS between the MSM and detector.
The principle of the MCS is based on the gas permeability of the fluoropol-
ymer membrane inside the degassing cell of the MCS. The eluent is guided
through a capillary with a fluoropolymer membrane inside the degassing
cell. A vacuum is generated in the degassing cell by the pump, at the
same time, the pump sucks CO
2
-free air – ambient air is aspired through a
CO
2
adsorption cartridge (11-4), which removes the CO
2
. The pressure
and concentration difference in the degassing cell in comparison to the
inside of the capillary now causes the CO
2
to diffuse out of the eluent
flow.
3.7.2 Connecting MCS
The MCS is connected between the MSM and detector.