Metrohm 833 IC Liquid Handling Unit - Manual (Page 44)

6 833 IC Liquid Handling Sample Preparation Unit
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
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6 833 IC Liquid
Handling Sample
Preparation Unit
This instrument version consists of the 833 IC Liquid Handling Unit
basic instrument and the 1.793.0110 Sample Preparation Module.
33 Sample preparation module
34 Sample preparation
connection
with permanently attached inlet
and outlet capillaries
35 Connection cable
connection cable to 833 IC Liquid
Handling Unit
Fig. 11: 1.793.0110 Sample Preparation Module
6.1 Connection to modular IC system for
neutralization
The 833 IC Liquid Handling Sample Preparation Unit is frequently used
for the neutralization of an alkaline sample for anion determination with
chemical suppression. Excessive amounts of strong bases (e.g. 30%
NaOH) should not be fed into the sample preparation module. In order
to ensure an adequate capacity for the exchange of Na + ions for H +
ions under all circumstances only a small fraction of the sample is fed
into the sample preparation module through a sample loop (e.g. 20 µL).
The analyte anions are retained on a downstream enrichment column,
then re-eluted with the eluent in counterflow and transferred to the
separating column.
This means that the necessary instrument configuration corresponds to
the Modular IC System 6 (MIC 6 Advanced: anion system with
chemical suppression, enrichment and matrix elimination), extended by
the 833 IC Liquid Handling Sample Preparation Unit. Samples with
a low load for the capacity of the sample preparation module can also
be added directly to the sample preparation module and transferred to
the sample loop. Switching then corresponds to the system described
in Section 6.2.
1
3
2
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