Agilent Technologies 1290 Infinity LC System System Manual And Quick Reference page 52

3
Optimization of the Agilent 1290 Infinity LC System
How to Achieve Higher Injection Volumes
One way to achieve larger injections is to use a trapping column selected by a
switching valve to capture and concentrate the injection before switching it,
i.e. injecting it, onto an analytical column, see
can be conveniently located in the Thermostatted Column Compartment.
Figure 21
52
Sample enrichment
Agilent 1290 Infinity LC System Manual and Quick Reference
Figure 21 on page 52. The valve