Abstract
The properties of sulphur dioxide as mobile phase in supercritical fluid chromatography have been examined. With neat supercritical sulphur dioxide polysiloxane and silica stationary phases were stripped from the columns and clogged the restrictors. The injector rotors needed frequent replacement and epoxy glued fused silica columns went to pieces. With a mixture of 20% sulphur dioxide in carbon dioxide, the problems were significantly reduced, but not completely. A series of columns were examined and all were eventually degraded, with the exception of a porous graphitic carbon column. The adsorptive properties of this material was too high, however, to be of any practical use with the SO2−CO2 mixture. The retention of polycyclic aromatic hydrocarbons as well as several other compounds was significantly reduced in 20% SO2 in CO2, compared to the retention in neat carbon dioxide, and good peak shapes were obtained before the columns became degraded. Before further progress can be made, however, capillary columns with stationary phases which can better withstand mixtures of sulphur dioxide and carbon dioxide are needed.
Published Version
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