Metrohm 753 Suppressor Module User Manual
Page 32
4.2 Maintenance and servicing
753 Suppressor Module / 8.753.1003 Instructions for Use
29
4.2.5
Regeneration of the suppressor
If the suppressor units are exposed to certain heavy metals (e.g. iron)
or organic contaminants for longer periods of time then these can no
longer be removed completely by the regeneration solution normally
used (20 mmol/L H
2
SO
4
). This diminishes the capacity of the suppres-
sor units which in milder cases results in a reduced sensitivity to phos-
phates and in severe cases in a strong increase in the baseline. If such
capacity problems occur then the suppressor units must be treated as
follows:
1 Disconnect suppressor from IC system
•
Disconnect suppressor from separating column and detector.
2 Regenerate suppressor
•
Rinse all 3 suppressor units one after another for about
10 min with one of the following solutions:
For heavy metal contamination
0.2 mol/L H
2
SO
4
For contamination with organic substances
0.2 mol/L H
2
SO
4
/ acetone
≥
20%
The 6.1826.050 Pump tubing is made of PVC and must not be used
for rinsing with solutions which contain acetone. In such cases a
different pump tubing or a different pump must be used for rinsing
purposes.
3 Connect suppressor to IC system
•
Reconnect suppressor to IC system. If there are still problems
with the capacity then the suppressor rotor must be ex-
changed (see section 4.2.6).