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DIVISION S-2-SOIL CHEMISTRY

Quinoline Sorption on Kaolinite–Humic Acid Complexes

^a Soil Science Program, Dep. of Agronomy, Pennsylvania State Univ., University Park, PA 16802 USA
^b Dep. of Civil and Environmental Engineering, Pennsylvania State Univ., University Park, PA 16802 USA
^c Dep. of Chemistry, Ohio State Univ., Columbus, OH 43210 USA

jdc7{at}psu.edu

Adsorption of quinoline and background electrolyte (LiCl) onto specimen kaolinite was measured as a function of surface-bound humic acid (HA) concentration , pH (3–10), and ionic strength (1–10 mM). Complexation of HA on the kaolinite surface (4.5 mg C kg^-1) reduced the point of zero net charge (pznc) for kaolinite by more than one pH unit and resulted in a significant increase in negative surface charge. Maximum sorption of quinoline occurred near its pK_a for all sorbents. Below the pK_a, quinoline sorption increases with increasing pH and decreasing proton competition. Above the pK_a, sorption is reduced in parallel with (but offset to a higher pH from) the ionized fraction. Competition with Li⁺ for surface sites is apparent from diminished quinoline adsorption with increasing ionic strength, but sorption of the ionized form of quinoline is always favored and kaolinite exhibits selectivity for cationic quinoline over . However, increasing f_OC diminishes quinoline sorption and selectivity and increases sorption reversibility relative to uncoated kaolinite. Humic acid alone exhibits lower selectivity for quinoline . The results indicate that mineral-sorbed humic substances can diminish retention of cationic quinoline despite an increase in overall cation-exchange capacity.

Abbreviations: BET, Brunauer–Emmett–Teller • CPMAS-NMR, cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy • DOC, dissolved organic C • EGME, ethylene glycol monoethyl ether • f_OC, mass fraction of soil organic C • HA, humic acid • NHC, N heterocyclic compound • PAC, polycyclic aromatic compound • pznc, point of zero net charge • TOC, total organic C

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