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Sorption Characteristics of Dissolved Phosphorus Compounds onto Iron (Oxy)hydroxides in Seawater

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Title:Sorption Characteristics of Dissolved Phosphorus Compounds onto Iron (Oxy)hydroxides in Seawater
Authors:Sulak, Daniel
Contributors:Ruttenberg, Kathleen (advisor)
Oceanography (department)
Global Environmental Science (department)
Date Issued:2007
Publisher:University of Hawaiʻi at Mānoa
Place of Publication:Honolulu
Abstract:Sorption of phosphorus (P) compounds by iron (Fe) (oxy)hydroxides significantly
influences dissolved P concentrations in marine environments. This research offers
comparisons of the kinetics and extent of the sorption of phosphate (PO4), adenosine monophosphate (AMP), adenosine triphosphate (ATP), and glucose 6-phosphate
(G6P) onto the Fe phases ferrihydrite, goethite, and hematite. Isotherm experiments
were conducted in which artificial seawater solutions containing various concentrations of a single P compound were mixed with a single Fe-phase and allowed to
equilibrate for three days. Kinetics experiments in which several identical samples
were shaken at a constant temperature and sacrificed in a time series were also carried
out. For all P compounds, the extent and rate of uptake from solution was in the
order ferrihydrite ≫ goethite > hematite. The extent of uptake of P onto ferrihydrite and goethite was of the order PO4 >G6P>ATP>AMP, while for hematite the
order was ATP>PO4 >AMP>G6P. While PO4 and organic P compounds displayed
similar sorption behavior, there exist differences in the sorption capacities and affinities of different P compound/Fe-phase combinations. The different sorption behavior
for the various P compound/Fe-oxide combinations has important implications for
the potential release of sorbed P compounds and the bioavailability of P in aquatic
Pages/Duration:59 pages
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Rights Holder:Sulak, Daniel
Appears in Collections: Global Environmental Science Theses

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