THE USE OF SOLID-PHASES FOR OFF-LINE COLLECTION IN SUPERCRITICAL-FLUID EXTRACTION WITH MODIFIERS

Recent advances in supercritical fluid extraction have involved the ex ploration of several new sorbents for solid-phase trapping during off- line collection. This article describes some experiments using physica l supports-such as glass beads, synthetic silica beads, and stainless steel balls-and chemical adsorbents-such as octadecyl-and cyano-modifi ed silica-for the collection of a set of test analytes. The authors va ried the collection and desorption temperatures and the modifiers.