Metrohm 850 Professional IC AnCat MCS User Manual download pdf (Page 81)

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4 Operation and maintenance

850 Professional IC – AnCat – MCS

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4.3 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.

4.4 Eluent

4.4.1 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 MΩ*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.

pH pH changes result in shifts in the dissociation

equilibria and hence changes in the retention

times.

Organic solvents The addition of an organic solvent (e.g. metha-

nol, acetone, acetonitrile) to aqueous eluents

generally accelerates lipophilic ions.

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Metrohm 850 Professional IC AnCat MCS User Manual Page 81