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(e)
Movement of the needle, and discharge of the lead
volume
Move the needle into the injection port.
The syringe discharges the lead volume (vl) + air
volume (va/2) + dead volume (vd) of sample into the
injection valve.
vd: Dead volume (the instrument inside parameter)
vi: Injection volume (the sample net volume to the flow path)
vl: Lead volume (forward part, cut volume)
vr: Rear volume (rearward part, cut volume)
va: Air volume (the air volume which sample is sandwiched.)
Figure 2-16 Discharging the Lead Volume
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2.2.3
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