Sorption of acridine to unbonded silica and the influence of pH and counterion concentration

Persistent Link:
http://hdl.handle.net/10150/192016
Title:
Sorption of acridine to unbonded silica and the influence of pH and counterion concentration
Author:
Hunter, Douglas Ralph,1963-
Issue Date:
1989
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Aqueous batch experiments were performed at four different pH's (2, 4, 6, 8) and at three different phosphate concentrations (0.001 M, 0.01 M, 0.1 M) to investigate the effects these variables have on acridine (pKₐ = 5.6) solubility. Results indicate that acridine solubility depends on both pH and counterion concentration. Twelve laboratory column experiments were conducted to investigate the sorption of acridine onto unbonded silica. Major variables included pH, counterion type, solute concentration, and pore water velocity. These experiments provided estimates of water-solid partition coefficient (range: 33 ± 5 cm³/g at pH 7 to 44 ± 5 cm³/g at pH 4), dispersion coefficient, and mass-transfer coefficient. It is hypothesized that sorption of the acridinium ion (pH 4) exceeded that of the neutral species due to the greater free energy change resulting from electrostatic interactions over solvophobic partitioning. The average time scales for desorption were 31 seconds at pH 7 and 43 seconds at pH 4. It is suggested that acridine sorption to unbonded silica is controlled primarily by the pH of the aqueous phase.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Acridine -- Solubility.; Organic compounds -- Solubility.; Groundwater -- Quality.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Bales, Roger C.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleSorption of acridine to unbonded silica and the influence of pH and counterion concentrationen_US
dc.creatorHunter, Douglas Ralph,1963-en_US
dc.contributor.authorHunter, Douglas Ralph,1963-en_US
dc.date.issued1989en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractAqueous batch experiments were performed at four different pH's (2, 4, 6, 8) and at three different phosphate concentrations (0.001 M, 0.01 M, 0.1 M) to investigate the effects these variables have on acridine (pKₐ = 5.6) solubility. Results indicate that acridine solubility depends on both pH and counterion concentration. Twelve laboratory column experiments were conducted to investigate the sorption of acridine onto unbonded silica. Major variables included pH, counterion type, solute concentration, and pore water velocity. These experiments provided estimates of water-solid partition coefficient (range: 33 ± 5 cm³/g at pH 7 to 44 ± 5 cm³/g at pH 4), dispersion coefficient, and mass-transfer coefficient. It is hypothesized that sorption of the acridinium ion (pH 4) exceeded that of the neutral species due to the greater free energy change resulting from electrostatic interactions over solvophobic partitioning. The average time scales for desorption were 31 seconds at pH 7 and 43 seconds at pH 4. It is suggested that acridine sorption to unbonded silica is controlled primarily by the pH of the aqueous phase.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshAcridine -- Solubility.en_US
dc.subject.lcshOrganic compounds -- Solubility.en_US
dc.subject.lcshGroundwater -- Quality.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairBales, Roger C.en_US
dc.identifier.oclc213339942en_US
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