1992-4. The Case of the Mystery Gradient Peak April 1, 1992 Sometimes you can solve a problem without gaining the satisfaction of understanding its cause. LCGC 10(4) 294-296 (1992) John W. Dolan Tags: air bubbles, bubbles, case study, column problems, contamination, equilibration, extra peaks, extracolumn effects, ghost peaks, gradient elution, outgassing