Metrohm 850 Professional IC Anion MCS Prep 2 - Manual (Page 101)

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4 Operation and maintenance
850 Professional IC – Anion – MCS – Prep 2
￭￭￭￭￭￭￭￭ 91
In order to record every new chromatogram under comparable condi-
tions, you should normally work with a freshly regenerated suppressor.
Caution
The MSM must never be switched over in a dry state, as there is a risk
of jamming. If the MSM is in a dry state, the MSM 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 must be
regenerated (see Chapter 4.11.3.1, page 91), cleaned (see Chapter
4.11.3.2, page 92) or replaced (see Chapter 4.11.3.3, page 95).
4.11.3 Maintenance
4.11.3.1 Regenerating the MSM
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 (50 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 signifi-
cant rise in the baseline in more serious cases. If such capacity problems
occur at one or more positions, the suppressor units must be regenerated:
Regenerating the MSM
Regenerate the MSM as follows:
1 Disconnecting the MSM from the IC system
￭ Disconnect the MSM from the separation column and detector.
2 Regenerating the MSM
Caution
The pump tubing made of PVC must not be used for rinsing with
solutions containing organic solvents. In this case, other pump
tubing must be used for rinsing.