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Naturally occurring organic compound...

Stanford University.

Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation.
Author:	Yoon, Tae Hyun.
Description:	180 p.
Notes:	Adviser: Gordon E. Brown, Jr.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4490.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Environmental Sciences.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3145579
ISBN:	0496045415

Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation.
Yoon, Tae Hyun.

Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation. - 180 p.

Adviser: Gordon E. Brown, Jr.

Thesis (Ph.D.)--Stanford University, 2004.

For oxalate anion, a representative LMW organic used in this study, we could find at least four different oxalate species at or near the boehmite/water interface using in-situ ATR-FTIR spectroscopy. Among these species, we predicted the coordination geometry as a bidentate side-on structure with a 5-membered ring structure using quantum chemical simulation methods. The adsorption of macromolecular organic compounds, such as Suwannee River fulvic acid (SRFA) at the boehmite/water interface have also been examined and showed that these humic substances are adsorbed at the boehmite/water interface predominantly in an outer-sphere adsorption mode. The impact of these macromolecular organic compounds on pollutant speciation and partitioning was also tested using XSW fluorescence yield measurement of Pb(II) and As(V) species in the interfacial region between organic thin films (i.e., PAA) and single crystal mineral substrates (i.e., alpha-Al2O3((0001) and (1-102)) and alpha-Fe2O3 (0001)). Under the conditions examined, it was observed that the majority of Pb(H) ions are preferentially bound to the PAA layer, suggesting that the binding sites at the PAA layer out-compete those of the alpha-Al2O3 (1-102) surface. However, it was also observed that the competing mineral surfaces follow the reactivity trend with respect to Pb(II) sorption, alpha-Fe2O 3 (0001) > alpha-Al2O3 (1-102) > alpha-Al 2O3 (0001)). In the last chapter, an application of a novel spectromicroscopic technique, STXM, is presented to demonstrate its capabilities as a potential probe for various colloidal particles in aqueous suspension. STXM images and XANES spectra at the Al K-edge (E = 1559.6 eV) of various Al-containing minerals and synthetic oxides are shown to demonstrate the capability of this spectromicroscopic tool to identify different Al-containing mineral colloids in multi-phase mixtures in aqueous solution.

ISBN: 0496045415Subjects--Topical Terms:

212393
Environmental Sciences.

Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation.
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245 1 0 $a Naturally occurring organic compounds at the mineral-water interfaces: Their interactions with mineral surfaces and impacts on pollutant speciation.
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500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4490.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a For oxalate anion, a representative LMW organic used in this study, we could find at least four different oxalate species at or near the boehmite/water interface using in-situ ATR-FTIR spectroscopy. Among these species, we predicted the coordination geometry as a bidentate side-on structure with a 5-membered ring structure using quantum chemical simulation methods. The adsorption of macromolecular organic compounds, such as Suwannee River fulvic acid (SRFA) at the boehmite/water interface have also been examined and showed that these humic substances are adsorbed at the boehmite/water interface predominantly in an outer-sphere adsorption mode. The impact of these macromolecular organic compounds on pollutant speciation and partitioning was also tested using XSW fluorescence yield measurement of Pb(II) and As(V) species in the interfacial region between organic thin films (i.e., PAA) and single crystal mineral substrates (i.e., alpha-Al2O3((0001) and (1-102)) and alpha-Fe2O3 (0001)). Under the conditions examined, it was observed that the majority of Pb(H) ions are preferentially bound to the PAA layer, suggesting that the binding sites at the PAA layer out-compete those of the alpha-Al2O3 (1-102) surface. However, it was also observed that the competing mineral surfaces follow the reactivity trend with respect to Pb(II) sorption, alpha-Fe2O 3 (0001) > alpha-Al2O3 (1-102) > alpha-Al 2O3 (0001)). In the last chapter, an application of a novel spectromicroscopic technique, STXM, is presented to demonstrate its capabilities as a potential probe for various colloidal particles in aqueous suspension. STXM images and XANES spectra at the Al K-edge (E = 1559.6 eV) of various Al-containing minerals and synthetic oxides are shown to demonstrate the capability of this spectromicroscopic tool to identify different Al-containing mineral colloids in multi-phase mixtures in aqueous solution.
520 # $a Research presented in this thesis is collectively aimed at addressing the following questions: (1) How do naturally occurring organic compounds interact with mineral surface under hydrous conditions? (2) What is the impact of these organic compounds on the speciation, transport and bioavailability of heavy metal pollutants? (3) What is the optimal experimental and/or theoretical strategy to probe mineral-water interfaces and extract detailed information on the species sorbed at such interfaces?
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