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7 metrohm co2 suppressor (mcs), 1 general information on the mcs, 2 connecting mcs – Metrohm 872 Extension Module Suppression – MCS User Manual

Page 34: Metrohm co, Suppressor (mcs), General information on the mcs, Connecting mcs, 7 metrohm co

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3.7 Metrohm CO

2

Suppressor (MCS)

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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.