Skip To Content

Evaluating a Peak’s Line Shape on a Chromatogram

January 4, 2010
by Arvin Moser, Team Manager, Application Scientists, ACD/Labs

The line shape of a peak on a chromatogram can offer some insight into the presence of a functional group. However, issues with the instrument are also known to affect the line shape for a peak.

The GC/MS EI+ Total Ion Chromatogram/Current (TIC) below shows five peaks. All of the peaks with the exception of the peak at 1.8 minutes exhibit a symmetrical line shape. The asymmetry of the peak at 1.8 minutes is typical for a structure containing an acidic group (i.e. -COOH).


The peak at 1.8 minutes is 2-ethylhexanoic acid.




Your email address will not be published. Required fields are marked *