Dependence of acridine adsorption on ligand hydration enthalpy

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1393· OSTI ID:6875131

Matzner, R; Bales, R C ^[1]

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1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Hydrology and Water Resources

The environmental fate of acridine is of concern because of its toxic and teratogenic properties. It is found in tobacco smoke, air pollution source effluents, recent lake sediments, wood preservative wastewater, wastewater treatment plant biosludge, and contaminated groundwater. The effect of the aqueous solution pH and ligand type (H[sub 2]PO[sup [minus]][sub 4], HPO[sup 2[minus]][sub 4], H[sub 2]CO[sub 3], HCO[sup [minus]][sub 3], Cl[sup [minus]], and ClO[sup [minus]][sub 4]) on acridine adsorption to silica was studied in a series of continuous-flow column experiments. The extent of acridine adsorption at solution pH's above its pK[sub a] was enhanced when H[sub 2]CO[sub 3]/HCO[sup [minus]][sub 3] was used as a buffer rather than H[sub 2]PO[sup [minus]][sub 4]/HPO[sup 2[minus]][sub 4], due to more exothermic hydration enthalpy of the H[sub 2]CO[sub 3]/HCO[sup [minus]][sub 3] buffer. The greater polarity of the acridinium cation and/or acridinium cation/ligand complexes at solution pH's below the pK[sub a] of acridine minimized the effect of differences in ligand hydration enthalpies on acridine adsorption. These results suggest that acridine mobility in groundwater would be buffer dependent.

• OSTI ID: 6875131
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 168:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ACRIDINES
ADSORPTION
AROMATICS
AZAARENES
AZINES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHLORATES
CHLORIDES
CHLORINE COMPOUNDS
ENVIRONMENTAL TRANSPORT
GROUND WATER
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
MASS TRANSFER
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLLUTION
PYRIDINES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
WATER
WATER POLLUTION