AssayIndex
Chromatography

Tailing factor (T)

Peak shape measure at 5 % of peak height: (a + b)/2a. USP convention; related to but not identical with the asymmetry factor.

Related terms

Asymmetry factor (As)
Peak shape measure taken at 10 % of peak height: the width of the rear half divided by the width of the front half. Symmetric = 1.00. Above 1.50 the index marks integration unreliable.
see also Rule AX-R12

Where this term appears

The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.