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http://hdl.handle.net/10125/69395Sorption Characteristics of Dissolved Phosphorus Compounds onto Iron (Oxy)hydroxides in Seawater
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| Sulak, Daniel.pdf | 754.33 kB | Adobe PDF | View/Open |
Item Summary
| 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) |
| Keywords: | biogeochemistry |
| 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 systems. |
| Pages/Duration: | 59 pages |
| URI: | http://hdl.handle.net/10125/69395 |
| 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 (GES) |
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