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DlELECTRIC constants of liquids and gases in binary and ternary systems have become increasingly important in the evaluation of kinetic data, stability constants, and acid dissociation constants (3,7,8,11,12,13). Because of the paucity of such data, the dielectric constants of 14 binary systems of common solvents were determined (Tables I and

This investigation was undertaken to define better some of the factors which influence the elution chromatography of rock and sediment organic matter containing high molecular weight components.The separation efficiencies of a normal paraffin hydrocarbon, n-octadecane-1 -C14, of an aromatic hydrocarbon, phenanthrene-9-C14, and of an aliphatic acid, octadecanoic-1 -C14 acid, in the presence of asphaltic petroleum or of Recent marine sediment organic matter have been determined on alumina columns. The presence of high molecular weight material on the columns caused the retention of some of the radioactive eluates beyond their normal points of effluence. Experimental evidence suggests association of asphaltic material with at least some of the Cl4-labeled substances. The relative inefficiency of chromatographic separations of the three tracer compounds was noted even in the absence of bituminous material.Chromatography is one the primary tools in the analysis of petroleum and of Recent marine sediment organic matter. The chromatographic analysis of petroleum distillate fractions is now routine; separation efficiencies in distillate fractions have been studied by Fink, Lewis, and Weiss (S), among others. In certain types of investigations, however, such as in geochemical studies, it is desirable to work with samples in their original state rather than with distillate fractions. This poses some difficulty because, as Witherspoon (10) has shown, crude petroleum has colloidal components. Winniford (9) reported that the molecular weights of the asphaltene colloids may go as high as 300,000. These high molecular weight particles seem to interfere with the chromatographic separations of petroleum constituents. Kleinschmidt (S), therefore, suggested the removal of the asphaltenes