Copper speciation in estuaries and coastal waters
Thesis (Ph. D .)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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| Formaat: | Thesis |
| Taal: | eng |
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Massachusetts Institute of Technology
2014
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| Online toegang: | http://hdl.handle.net/1721.1/84844 |
| _version_ | 1826212164590895104 |
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| author | Kogut, Megan Brook, 1972- |
| author2 | Bettina Voelker. |
| author_facet | Bettina Voelker. Kogut, Megan Brook, 1972- |
| author_sort | Kogut, Megan Brook, 1972- |
| collection | MIT |
| description | Thesis (Ph. D .)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002. |
| first_indexed | 2024-09-23T15:17:03Z |
| format | Thesis |
| id | mit-1721.1/84844 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:17:03Z |
| publishDate | 2014 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/848442019-04-11T11:33:27Z Copper speciation in estuaries and coastal waters Cu speciation in estuaries and coastal waters Kogut, Megan Brook, 1972- Bettina Voelker. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis (Ph. D .)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002. Includes bibliographical references. The goals of this dissertation are to better understand the sources and the Cu binding ability of ligands that control Cu toxicity in estuaries and harbors, where elevated Cu concentrations have caused documented toxic effects on microorganisms, fish, and benthic fauna. I modified and improved a commonly used approach to determine metal speciation (competitive ligand exchange adsorptive cathodic stripping voltammetry, CLE-ACSV). Using this new approach to chemical Cu speciation and an old approach to physical Cu speciation (filtration), I show that riverine humic substances, filtrable, recalcitrant and light absorbing molecules from degraded plant material, can account for all of the Cu binding in the Saco River estuary. This finding directly supports the hypothesis that terrestrial humic substances might be the most important source of Cu ligands for buffering Cu toxicity in coastal locations with freshwater inputs. However, fieldwork in coastal waters with large inputs of both Cu and suspended colloids (Boston Harbor, Narragansett Bay, and two ponds on Cape Cod) shows that some Cu present in these samples is inert to our competitive ligand exchange method for at least 48 hours. These results support the hypothesis that a significant fraction of the Cu present in these samples is physically sequestered in colloidal material, with the remaining fraction complexed by humic substances. Previous studies of Cu speciation were not able to distinguish between strongly complexed Cu and inert Cu, and our analytical approach should be used further to determine the role of colloids in Cu speciation in all natural waters. by Megan Brook Kogut. Ph.D . 2014-02-10T16:53:31Z 2014-02-10T16:53:31Z 2002 2002 Thesis http://hdl.handle.net/1721.1/84844 51883651 eng M.I.T. 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. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 160, [8] leaves application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Kogut, Megan Brook, 1972- Copper speciation in estuaries and coastal waters |
| title | Copper speciation in estuaries and coastal waters |
| title_full | Copper speciation in estuaries and coastal waters |
| title_fullStr | Copper speciation in estuaries and coastal waters |
| title_full_unstemmed | Copper speciation in estuaries and coastal waters |
| title_short | Copper speciation in estuaries and coastal waters |
| title_sort | copper speciation in estuaries and coastal waters |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/84844 |
| work_keys_str_mv | AT kogutmeganbrook1972 copperspeciationinestuariesandcoastalwaters AT kogutmeganbrook1972 cuspeciationinestuariesandcoastalwaters |