Metrohm 881 Compact IC pro – Anion - Manual (Page 93)

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5 Operation and maintenance
881 Compact IC pro – Anion
￭￭￭￭￭￭￭￭ 83
5.11.3 Maintenance
5.11.3.1 Parts of the suppressor
1
2
3
4
5
Figure 39 Parts of the suppressor
1 Union nut 2 Connecting piece (6.2832.010)
3 Rotor 4 Housing
5 Slot in the housing
5.11.3.2 Regenerating the suppressor
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 standard regeneration solution. The capacity of the sup-
pressor units is consequently affected, which can result in reduced phos-
phate sensitivity in less serious cases and a significant rise in the baseline in
more serious cases.
If such capacity problems occur at one or more positions, all suppressor
units must be regenerated with one of the following solutions:
￭ 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%
Caution
The pump tubings made of PVC must not be used for rinsing with solu-
tions containing organic solvents.
We recommend to use the high pressure pump for regeneration.