Metrohm 940 Professional IC Vario ONE/SeS/LPG - Manual (Page 12)

2.2 Intended use
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940 Professional IC Vario ONE/SeS/LPG (2.940.1450)
Metrohm CO
2
Suppressor (MCS)
The Metrohm CO
2
Suppressor (MCS) removes the CO
2
from the eluent
flow. This lowers the background conductivity, improves detection sensi-
tivity and minimizes the injection peak and carbonate peak.
Detector
Metrohm offers a series of different detectors for various analysis tasks. A
suitable detector type must be ordered as a separate accessory.
Sample degasser
The sample degasser removes gas bubbles and dissolved gases from the
sample.
Low-pressure gradient
Up to three different eluents can be mixed using the low-pressure gradi-
ent. They are mixed in the low-pressure zone, i.e. before the eluent is fed
to the high-pressure pump.
Separation column
The intelligent separation column separates different components accord-
ing to their interactions with the column. Metrohm separation columns
are equipped with a chip where their technical specifications and history
(start-up, operating hours, etc) are stored.
2.2 Intended use
The 940 Professional IC Vario ONE/SeS/LPG is used for the determination
of anions or polar substances using sequential suppression using ion chro-
matography when the complex separation problem requires the use of
gradients.
Sequential suppression consists of:
￭ Chemical suppression with a Metrohm Suppressor Module (MSM) and
subsequent
￭ CO2 suppression with the Metrohm CO2 Suppressor (MCS).
Background conductivity is reduced to a minimum with sequential sup-
pression.
The low-pressure mixing valve and two additional eluent degassers in the
lower plug-in are used for the controlled mixing of up to three eluents.
The instrument can also be used as needed for the determination of cati-
ons or anions without chemical suppression.
The present instrument is suitable for processing chemicals and flammable
samples. Usage of the 940 Professional IC Vario therefore requires the