246 Understanding Your Agilent ChemStation
11 Evaluating System Suitability
Performance Test Definitions
True Peak Width W
x
[min]
Capacity Factor (USP), Capacity Ratio (ASTM) k'
where:
T
R
= retention time of peak [min]
T
0
= void time [min]
USP Tailing Factor (USP) t
where:
t
w
= distance in min between peak front and TR, measured at 5% of the peak
height
W
5.0
= peak width at 5% of peak height [min]
W
B
base width, 4 sigma, obtained by intersecting tangents through the inflection points
with the baseline (tangent peak width)
W
4.4
width at 4.4% of height (5 sigma width)
W
5.0
width at 5% of height (tailing peak width), used for USP tailing factor
W
50.0
width at 50% of height (true half-height peak width or 2.35 sigma).
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