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The Sorption of Pyrene and Anthracene to Humic Acid-Mineral Complexes: Effect of Fractional Organic Carbon Content

Department of Agronomy, The Ohio State Univ., Columbus, OH 43210

^* Corresponding author (onken{at}ude1.edu).

ABSTRACT

Carbon-normalized distribution coefficients (K_oc) of organic solutes appear to increase as the amount of organic C in a system decreases. This study was conducted to determine the effect of fractional organic C content (f_oc) on the sorption of anthracene and pyrene. Batch-sorption experiments were conducted on reagent CaCO₃, a geologic calcite, and a montmorillonite to measure anthracene and pyrene sorption. An organic C-free mineral surface and two surface loadings of humic acid (HA) were evaluated. The K_oc of anthracene and pyrene varied with f_oc as well as with the underlying mineral surface. The sorption of anthracene and pyrene to all HA-mineral complexes increased with increases in f_oc, while K_oc for the compounds decreased. In higher f_oc systems (>3 x 10^–5), isotherms were C-type curves indicative of partitioning. In lower f_oc systems (<3 x 10^–5), isotherms were commonly L and S-type curves indicative of adsorption and condensation. Sources of potential experimental artifact examined were loss of HA from the mineral surface to solution, dissolution of CaCO₃ during the experiment, and loss of NOS to experimental glassware or volatilization. None were found to contribute to the observations made. Our results suggest that adsorption-condensation of pyrene and anthracene created more surface excess than predicted by partitioning alone as evidenced by the large experimental K_oc values obtained.

B.M. Onken, present address: Dep. of Plant and Soil Sciences, Univ. of Delaware, 149 Townsend Hail, Newark, DE 19717-1303.

Received for publication August 28, 1995.

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