18
Intended use
Alternating precleaning of a sample
Basics
The precleaning of a sample is used in chromatography,
for example in the following cases:
Preseparation or separation of heavily retarding substances
Precleaning samples, alternating and time-delayed on differ-
ent precolumns
Optimization of analysis times
Note:
Several valves can be connected with each other to
preclean sample alternating on different precolumns
for the analysis.
Fig. 17
Alternating sample precleaning – sample is filled in the
precolumn B
Precolumn B is filled with sample by pump A and flushed
directly to the analytical column. Simultaneously, precolumn B
is prepared by pump B with a second solvent. The solvent is fed
through detector B to the waste container.
Injection
on precolumn
Pump B
Eluent B
Pump A
Eluent A
Waste
Detector B
Detector A
Precolumn B
Precolumn A
Column
Injection
