Metrohm 850 Professional IC Anion MCS Gradient - Manual (Page 98)

4.11 Metrohm Suppressor Module (MSM)
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850 Professional IC –Anion – MCS – Gradient
Note
The high pressure pump can be used for regeneration. For this,
remove the guard column and separation column and connect the
capillary directly to the MSM (regenerate in opposite direction).
￭ Rinse the 3 suppressor units with the following solutions for
about 15 minutes each:
– Contamination with heavy metals:
1 mol/L H
2
SO
4
+ 0.1 mol/L oxalic acid
– Contamination with organic cationic complexing
agents:
0.1 mol/L H
2
SO
4
/ 0.1 mol/L oxalic acid / acetone 5%
– Severe contamination with organic substances:
0.2 mol/L H
2
SO
4
/ acetone ≥ 20%
3 Connecting the MSM to the IC system
￭ Reconnect the MSM to the IC system. If the capacity problems
remain, MSM rotor A must be replaced (see Chapter 4.11.3.3,
page 91).
4.11.3.2 Cleaning the MSM
It may be necessary to clean the MSM in the following cases:
￭ Increased backpressure onto the output capillaries of the MSM.
￭ Blockage of the MSM which cannot be eliminated (solutions can no
longer be pumped through the MSM).
￭ Jamming of the MSM which cannot be eliminated (MSM can no longer
be switched over).