Handling The Eluent; Manufacturing Eluent - Metrohm 930 Compact IC Flex Oven/ChS Manual

5.5 Handling the eluent

5.5 Handling the eluent
5.5.1

Manufacturing eluent

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54
Replacing the preheating capillary
In order to make threading the column inlet capillary into the column
oven's preheating grooves easier, we recommend loosening the screws for
the holder plate a little, but not removing them all the way.
1 Guide the column inlet capillary into the column oven via one of the
recesses at the bottom (14-1).
2 Push the column inlet capillary into the outer preheating groove
(14-3) from the bottom. Continue pushing it through under the
holder plate until it comes back out the top.
3 Carefully bend the column inlet capillary downward and push it
through the inner preheating groove until it comes out at the bottom
edge of the holder plate.
Careful handling of the eluent ensures stable analysis results. Keep the fol-
lowing general measures in mind when handling the eluent:
The supply bottle with the eluent must be connected as indicated in
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chapter 3.6, page 20. This is particularly important for eluents with vol-
atile solvents (e.g. acetone).
Avoid condensation in the eluent bottle. Drop formation can change
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the concentration ratio in the eluent.
In the case of very sensitive measurements, we recommend that the
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eluent be stirred constantly with a magnetic stirrer (e. g. the
2.801.0010 with 6.2070.000).
To protect the IC system from foreign particles, we recommend aspirat-
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ing the eluent via an aspiration filter (see Chapter 3.6, page 20)
(6.2821.090). This aspiration filter must be replaced as soon as it turns
yellow but at least every 3 months.
Chemicals used for manufacturing eluents must have a purity grade of at
least "p.a.". They may be diluted only by using ultrapure water (resistance
> 18.2 MΩ*cm). (These specifications apply generally for all reagents used
in ion chromatography.)
Newly manufactured eluents always need to be microfiltered (0.45 µm fil-
ter).
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930 Compact IC Flex Oven/ChS (2.930.2200)