Metrohm 753 Suppressor Module Supplement - Manual

METROHM Ltd. CH-9101 Herisau (Switzerland)
753 Suppressor Module
8.753.1023 Supplement to 8.753.1003 Instructions for Use
This supplement contains corrections and supplements to the 8.753.1003 Instructions for
Use. All page numbers quoted refer to said 753 Instructions for Use.
Regeneration of the suppressor p. 29
The following instructions on how to regenerate the Metrohm Suppressor Module re-
place section 4.2.5 of the 753 Instructions for Use:
Regenerating a suppressor operating at reduced capacity
If the suppressor units are exposed to certain heavy metals (e.g. iron) or organic
contaminants for long periods of time, 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 suppressor units, which, in milder cases, results in reduced sensitiv-
ity to phosphates and, in severe cases, in a strong increase in the baseline. If such
capacity problems occur at one or more points, treat the suppressor units affected
as follows:
1 Disconnect suppressor from IC system
• Disconnect suppressor from separating column and detector.
2 Regenerate suppressor
• Rinse each suppressor unit for about 15 min with one of the following
solutions:
Contamination with heavy metals
1 mol/L H
2
SO
4
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%
The 6.1826.050 pump tubing is made of PVC and must not be used
for rinsing with solutions containing acetone. In such cases, use a
different pump tubing or a different pump for rinsing purposes.
3 Connect suppressor to IC system
• Reconnect suppressor to the IC system. If the capacity problems persist,
replace the suppressor rotor (see section 4.2.7).
753 Suppressor Module, 8.753.1023
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