Abstract: Ethanolamine, diethanolamine and triethanolamine are separated by ion-pair chromatography on an ODS column and detected by their suppressive effect on the copper(II)- or cobalt(II)-catalyzed chemiluminescence emission from the luminol reaction. Post-column reaction conditions were simplex optimized using a flow injection manifold. Limits of detection (twice the peak-to-peak noise) for ethanolamine, diethanolamine and triethanolamine was 0.8, 1.2 and 0.2 nmol, respectively.