Abstract
Oxidative and reductive amperometric detection of phenols, nitroaromatic compounds and a cyclic ketone is demonstrated in packed capillary column supercritical fluid chromatography (SFC). The detection was performed in combination with isobaric, as well as, pressure programmed SFC separations, using a 25 μ platinum electrode and carbon dioxide modified with a low concentration (1–5%) of methanol as the mobile phase. A relative standard deviation in the peak height of ca. 5% ( n = 10) was found for ng injections of analyte in combination with both oxidative and reductive detection. The detection limit was determined to be 250 pg for oxidative detection of 2,6-dimethylphenol and 100 pg for reductive detection of 1,3-dinitrobenzene.
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