Metrohm 850 Professional IC Anion MCS Prep 3 - Manual (Page 102)

4.10 Sample preparation module (SPM)
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850 Professional IC –Anion – MCS – Prep 3
Caution
In the case of reduced capacity or high backpressure, the SPM must be
regenerated (see Chapter 4.10.3.1, page 92), cleaned (see Chapter
4.10.3.2, page 93) or replaced (see Chapter 4.10.3.3, page 95).
4.10.3 Maintenance
4.10.3.1 Regenerating the SPM
If the neutralization units are loaded with certain heavy metals (e.g. iron)
or organic impurities, these can no longer be completely removed with
the regeneration solution (100 mmol/L HClO
4
) normally used. The capacity
of the neutralization units is affected by this, which can lead to a reduced
detection sensitivity. If such capacity problems occur at one or more posi-
tions, the neutralization units must be regenerated:
Regenerate the SPM
Regenerate the SPM as follows:
1 Disconnecting the SPM from the system
￭ Switch off the instrument.
￭ Disconnect capillary connections of the SPM from the system.
2 Regenerate the SPM
Caution
The pump tubings made of PVC must not be used for rinsing with
solutions containing organic solvents. In this case, other pump
tubings must be used for rinsing.
￭ Rinse the 3 neutralization units with the following solutions for
about 15 minutes each:
– 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%