Abstract
Microwave-induced plasma atomic emission detection is examined for supercritical fluid chromatograpiy detection with binary methanol/ carbon dioxide mobile phases. Spectra are obtained and compared with pure helium plasmas, plasmas with added carbon dioxide, and added binary mobile phases. Trends of molecular emission intensities and species were examined as functions of metianol/carbon dioxide composition ratios and supercritical fluid pressures. Adding carbon dioxide to the pure helium plasma reduced and/or eliminated molecular bands from OH and N 2 + while producing intense bands of CN, C 2 , NH, and N 2
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