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(c)
Sampling
The syringe aspirates one-half of the air volume (va/2)
while needle is moving to the sample vial.
The syringe aspirates the waste volume (vw) + injection
volume (vi) of sample after the needle has moved into
the sample vial.
vd: Dead volume (the instrument inside parameter)
vi: Injection volume (the sample net volume to the flow path)
vw: Waste volume (the air volume of the lead and rear part of a sample)
va: Air volume (the air volume which sample is sandwiched.)
Figure 2-37 Sampling
2 - 43
2.2.3
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