Metrohm 833 IC Liquid Handling Unit - Manual (Page 90)

9 Troubleshooting - maintenance
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
82
9.2.6 Suppressor module / Sample preparation module
The 1.753.0010 Suppressor Module and the 1.793.0010 sample
preparation module have the same technical construction so their
maintenance is described jointly. Wherever the different chemistry
requires a different treatment for the modules this is expressly
mentioned in the text.
9.2.6.1 Regenerating the actuator units
If the suppressor units of the suppressor module or the cation
exchanger units of the sample preparation module come into contact
with certain heavy metals (e.g. iron) or organic contaminants for a
longer period of time then these can no longer be completely removed
with the regeneration solutions normally used (50 mmol/L H
2
SO
4
or 50
mmol/L HClO
4
). This affects the capacity of the actuator units of the
module. If such capacity problems occur then the actuator units must
be treated as follows:
1 Disconnect suppressor module/sample preparation
module from IC system
• Disconnect the module from column and detector.
2 Regenerate suppressor module
• Rinse all 3 actuator units in sequence for approx. 10 min with
one of the following solutions:
Contamination with heavy metals
0.2 mol/L H
2
SO
4
+ 0.1 mol/L oxalic acid (for Fe 2+ /Fe +3 )
Contamination with organic substances
0.2 mol/L H
2
SO
4
/ acetone ≥ 20%
Regenerate sample preparation module
• Rinse all 3 actuator units in sequence for approx. 10 min with
one of the following solutions:
Contamination with heavy metals
0.2 mol/L HClO
4
+ 0.1 mol/L oxalic acid (for Fe 2+ /Fe +3 )
Contamination with organic substances
0.2 mol/L HClO
4
/ acetone 20%
The 6.1826.050/6.1826.010 Pump tubing consists of PVC and must
therefore not be rinsed with solvents that contain acetone. In this case
you should either use different pump tubing or use a different pump
for rinsing.