Metrohm 793 IC Sample Preparation Module - Manual (Page 36)

4 Malfunctions - Maintenance
793 IC Sample Prep Module/ 8.793.1003 Instructions for Use
32
4.2.5 Regeneration of the cation exchange material
If the actuator units are exposed to certain heavy metals (e.g. iron) or
organic contaminants for longer periods of time then these can no lon-
ger be removed completely by the regeneration solution normally used
(20 mmol/L HClO
4
). This diminishes the capacity of the actuator units. If
such capacity problems occur then the actuator units must be treated
as follows:
1 Disconnect SP Module A from IC system
2 Regenerate cation exchange material
x Rinse all 3 actuator units one after another for about 10 min
with one of the following solutions:
For heavy metal contamination
0.2 mol/L HClO
4
+ 0.1 mol/L oxalic acid (in case of Fe +2 /Fe +3 )
For contamination with organic substances
0.2 mol/L HClO
4
/ acetone t 20%
The 6.1826.010 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 (e.g. 709 IC Pump) must be
used for rinsing purposes.
3 Connect SP Module A to IC system
x Reconnect SP Module A to IC system. If there are still prob-
lems with the capacity then the actuator rotor must be ex-
changed (see section 4.2.6).