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UBC Theses and Dissertations
The role of colloids in providing a source of iron to phytoplankton Wells, Mark L.
Abstract
Iron-rich colloidal material was found to be associated with diatoms in the natural environment. To determine if this association could be important to the organism, the supply of iron from colloidal forms to phytoplankton was investigated. Laboratory bioassays with the marine diatom Thalassiosira pseudonana demonstrated that freshly precipitated colloidal iron could readily support diatom growth. However, when these colloids were aged or subjected to short periods of heating, the iron availability was drastically reduced. The iron availabilty was not increased with addition of the complexing agent EDTA. The reduction in availability appears to be linked to increased thermodynamic stability of the colloidal hydrous ferric oxides. The probable mechanism of this reduction is decreased colloidal dissolution rates. The supply of iron from colloids to phytoplankton appears to be determined by the chemistry of the colloidal iron material rather than by the physical association of colloidal iron and cell walls.
Item Metadata
Title |
The role of colloids in providing a source of iron to phytoplankton
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1982
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Description |
Iron-rich colloidal material was found to be associated with diatoms in the natural environment. To determine if this association could be important to the organism, the supply of iron from colloidal forms to phytoplankton was investigated. Laboratory bioassays with the marine diatom Thalassiosira pseudonana demonstrated that freshly precipitated colloidal iron could readily support diatom growth. However, when these colloids were aged or subjected to short periods of heating, the iron availability was drastically reduced. The iron
availabilty was not increased with addition of the complexing agent EDTA. The reduction in availability appears to be linked to increased thermodynamic stability of the colloidal hydrous ferric oxides. The probable mechanism of this reduction is decreased colloidal dissolution rates. The supply of iron from colloids to phytoplankton appears to be determined by the chemistry of the colloidal iron material rather than by the physical association of colloidal iron and cell walls.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-03-31
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0053299
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.