Metrohm 850 Professional IC Anion MSM-HC - LP-Gradient - Manual (Page 97)

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5 Operation and maintenance
850 Professional IC Anion MSM-HC LP Gradient
￭￭￭￭￭￭￭￭ 87
2 Regenerating the MSM-HC
Caution
The pump tubings made of PVC must not be used for rinsing with
solutions containing organic solvents. In this case, other pump
tubings must be used for rinsing.
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-HC (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-HC to the IC system
￭ Reconnect the MSM-HC to the IC system. If the capacity problems
remain, the MSM-HC rotor A must be replaced (see Chapter
5.11.3.3, page 90).
5.11.3.2 Cleaning the MSM-HC
It may be necessary to clean the MSM-HC in the following cases:
￭ Increased backpressure onto the connection tubings of the MSM-HC.
￭ Blockage of the MSM-HC which cannot be eliminated (solutions can
no longer be pumped through the MSM-HC).
￭ Jamming of the MSM-HC which cannot be eliminated (MSM-HC can
no longer be switched over).