Measurements of Association and Partition Equilibria of n-Alkylbenzenes with Fulvic Acid, Humic Acid, Sodium Dodecylbenzenesulfonate, n-Dodecane, and 1-Octanol in Aqueous Media by Headspace Gas Chromatography

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dc.contributor.advisorHussam, Abul
dc.contributor.authorEljack, Mahmoud
dc.creatorEljack, Mahmoud
dc.date.accessioned2014-08-28T03:14:42Z
dc.date.available2014-08-28T03:14:42Z
dc.date.issued2013-08
dc.description.abstractNatural organic matter (NOM) such as humic acids (HA), fulvic acids (FA), and humin in soils and sediments plays an important role in partitioning, binding, and transport of organics and metal ions in nature. We have developed an equilibrium headspace gas chromatographic (HSGC) technique and the theory to study the association and partitioning of n-alkylbenzenes (benzene, toluene, ethylbenzene, n-propylbenzene, and n-butylbenzene) with aqueous FA, HA, and sodium dodecylbenzenesulfonate (SDBS). The alkylbenzenes were chosen because they are the major constituents of gasoline and also toxic to human health and the environment. The precise measurement of n-alkylbenzenes in the vapor phase in equilibrium with the liquid phase allowed determination of solute - monomer surfactant (S), association constants (K<sub>11</sub>), solute- aggregate, S<sub>n</sub>, association constant (K<sub>n1</sub>), critical aggregation constants for FA, HA, and SDBS. It also allowed measurements of the mole fraction based partition coefficients (K<sub>x</sub>), infinite dilution activity coefficients of solute inside the aggregate pseudo-phase (&gamma;m), and the transfer free energies of alkyl chain -CH<sub>2</sub>- and benzene from aqueous to aggregate pseudo-phase. Theory shows that the parameters can be calculated without the concentration of the solute. All measurements were made at infinite dilution (<10</super>-6</super> mole fraction) where solute-solute interactions are nonexistent. Almost no such studies could be found in the literature and, therefore, constitute a fundamental contribution in this field.
dc.format.extent165 pages
dc.identifier.urihttps://hdl.handle.net/1920/8787
dc.language.isoen
dc.rightsCopyright 2013 Mahmoud Eljack
dc.subjectAnalytical chemistry
dc.subjectPhysical chemistry
dc.subjectAssociation and Partition Equilibria of n-Alkylbenzenes with Fulvic Acid
dc.subjectHumic Acid
dc.subjectSodium Dodecylbenzenesulfonate
dc.subjectFulvic acid
dc.subjectHeadspace Gas Chromatography
dc.subjectHumic acid
dc.subjectLiquid Liquid Extraction
dc.subjectMeasurements of Association and Partition Equilibria of n-Alkylbenzenes with Fulvic Acid
dc.subjectHumic Acid
dc.subjectSodium Dodecylbenzenesulfonate
dc.subjectN-Dodecane
dc.subjectAnd 1-Octanol in Aqueous Media by Headspace Gas Chromatography
dc.titleMeasurements of Association and Partition Equilibria of n-Alkylbenzenes with Fulvic Acid, Humic Acid, Sodium Dodecylbenzenesulfonate, n-Dodecane, and 1-Octanol in Aqueous Media by Headspace Gas Chromatography
dc.typeDissertation
thesis.degree.disciplineChemistry
thesis.degree.grantorGeorge Mason University
thesis.degree.levelDoctoral

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