Hi, I am working on an application right now trying to analyse acetic acid in small quantities in an aqueous medium. I am using a Perkin Elmer GC with a FFAP column and FID. When injecting my standard (made up in water from Sigma) there is a broad split peak where the acetic acid is supposed to be. I injected neat glacial acetic acid and there was a nice peak, no broadening or splitting. Then I injected water (no response as you would expect with FID). Is is possible that the water is changing the peak shape of the acetic acid and interferring? The inlet is at 200, oven at 180 and detector at 220. Also I the linear is loosely packed with quartz glass. Any comments?