Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient - Manual (Page 96)

5.11 High Capacity Metrohm Suppressor Module (MSM-HC)
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86 ￭￭￭￭￭￭￭￭
850 Professional IC Anion MSM-HC LP Gradient
The MSM-HC consists of 3 suppressor units, which are used for suppres-
sion, regenerated with sulfuric acid or rinsed with ultra pure water in rota-
tion. In order to record every new chromatogram under comparable con-
ditions, you should normally work with a freshly regenerated suppressor.
Caution
The MSM-HC must never be switched over in a dry state, as there is a
risk of jamming. If the MSM-HC is in a dry state, the MSM-HC must be
rinsed for at least 5 minutes before it may be switched over.
Caution
In the case of reduced capacity or high backpressure, the MSM-HC
must be regenerated (see Chapter 5.11.3.1, page 86), cleaned (see
Chapter 5.11.3.2, page 87) or replaced (see Chapter 5.11.3.3, page
90).
5.11.3 Maintenance
5.11.3.1 Regenerating the MSM-HC
If the suppressor units are loaded for a longer period with certain heavy
metals (e.g. iron) or organic impurities, these can no longer be completely
removed with the regeneration solution (100 mmol/L H
2
SO
4
) normally
used. The capacity of the suppressor units is consequently affected, which
can result in reduced phosphate sensitivity in less serious cases and a sig-
nificant rise in the baseline in more serious cases. If such capacity prob-
lems occur at one or more positions, the suppressor units must be regen-
erated:
Regenerating the MSM-HC
1 Disconnecting the MSM-HC from the IC system
￭ Disconnect the capillaries of the MSM-HC from the separation
column and MCS (if used) or the detector.