1991-1. Sample Adsorption in Liquid Chromatography Injection Valves January 1, 1991 When fixed-volume injections produce variable peak sizes, sample adsorption may be the cause. LCGC 9(1) 22-26 (1991) John W. Dolan Tags: autosamplers, case study, injection valves, loop filling, PEEK, precision problems, sample problems, solvent choices, stainless steel