Metrohm 872 Extension Module - Manual (Page 49)

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6 Operation and maintenance
872 Extension Module IC Module
￭￭￭￭￭￭￭￭ 41
6.1.4 Shutting down
If the instrument is shut down for a longer period of time, the entire IC
system must be rinsed as follows to rid it of salts in order to prevent elu-
ent salts from forming crystals which may cause subsequent damage.
￭ rinse all capillaries and the Dosino with methanol/ultra pure water
(1:4),
￭ rinse all pump tubings of the peristaltic pump with ultra pure water.
6.2 Door
Caution
The door is made of PMMA (polymethylmetacrylate). It must never be
cleaned with abrasive media or solvents.
Caution
Never use the door as a handle.
6.3 Eluent
6.3.1 Production
The chemicals used for the production of eluents should have a degree of
purity of at least "p.a.". Only ultra pure water (resistance > 18.2 M
Ω *cm)
may be used for dilution (this generally applies for reagents which are
used in ion chromatography).
Newly produced eluents should always be microfiltered (filter 0.45 µm).
Caution
Only microfiltered (filter 0.45 µm) eluents may be used.
The composition of the eluent has a crucial effect on the chromatographic
analysis:
Concentration An increase in the concentration generally leads
to shorter retention times and faster separation,
but also to higher background conductivity.