[Empirical expressions for the chromatographic peak width at inflection points and base].
From EMG function and linear regression, the projective distances on abscissa between inflection points in the left side (TL) or in the right side (TR) and the apex of a chromatographic peak which the asymmetry at 0.1 height fraction is within 1.09-3.00 can be expressed as: TL = -0.7898 + 0.8219 W(0.1,L), TR = 0.03536 + 0.4582 W(0.1,L), where W(0.1,L) is the projective distance on abscissa between the point at 1/10 height fraction in the left side and the apex. The correlation coefficients are all over 0.998 and the relative error limits are within -0.65%-0.40% and -0.39%-0.67%, respectively. The relationship between the peak width at base Wb and the peak width at half height W(0.5) or the peak width at 1/10 height fraction W(0.1) can be expressed as: Wb = 0.04827 + 1.6907 W(0.5), Wb = 1.9066 + 0.5300 W(0.1). The correlation coefficients are all over 0.999 and the relative error limits are within -0.54%-0.69% and -1.05%-1.40%, respectively.
Shi
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Department of Chemistry, University of Science and Technology of China, Hefei, 230026.
Su
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Wu
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