Quinoline sorption to subsurface materials: role of pH and retention of the organic cation

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00148a013· OSTI ID:5621851

Zachara, J M; Ainsworth, C C; Felice, L J; Resch, C T

The sorption of quinoline (pK/sub a/ = 4.94) was investigated on low-organic-carbon subsurface materials that varied in pH. Sorption isotherms were measured from 10/sup -7/ to 10/sup -4/ M quinoline and were found to be nonlinear. The resulting Freundlich constant (K/sub F/), based on total aqueous quinoline concentration, were poorly correlated with subsoil properties, including organic carbon. Higher sorption in the acidic subsoils and favorable coefficients for regression of K/sub F/, normalized to cation-exchange capacity vs. the ionization fraction (Q), point to the importance of ion exchange of the protonated compound. When the subsoil pH is adjusted, it is shown that sorption parallels the ionization fraction and retention of the organic cation far exceeds that of the neutral species. Calculations of surface speciation and thermodynamic parameters of sorption (..delta..H/sup 0/, ..delta..S/sup 0/) point to ion exchange and/or surface protonation at pH, levels exceeding pK/sub a/ by greater than 2 log units. It is suggested that in subsurface materials of low carbon content, quinoline sorption is controlled by pH the nature and capacity of the exchange complex, and groundwater ion composition. 46 references, 5 figures, 4 tables.

• Research Organization: Pacific Northwest Lab., Richland, WA
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5621851
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 20:6; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AROMATICS
AZAARENES
AZINES
CHEMICAL COMPOSITION
CHEMISTRY
GROUND WATER
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
ION EXCHANGE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PYRIDINES
QUINOLINES
RESPONSE MODIFYING FACTORS
SOIL CHEMISTRY
SORPTION
WATER