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Free Content The role of colloid chemistry in providing a source of iron to phytoplankton

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Culture experiments with the coastal marine diatom Thalassiosira pseudonana (WHOI clone 3H) demonstrate that, as an iron source, freshly prepared colloidal ferric hydroxide can produce better cell yield than the more crystalline goethite or hematite, Ageing or heating of the prepared ferric hydroxide stock causes a reduction in cell yield. This reduction appears to be related to increased thermodynamic stability of the colloid as suggested by thermogravimetric analysis and relative dissolution rates. The reduction in cell yield can be prevented by the addition of the chelating agent EDTA prior to, but not after, ageing or heating of the ferric hydroxide stock. These results suggest that the ability of colloidal iron to provide a source of metal for phytoplankton is related to the thermodynamic stability of the colloid.

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Document Type: Research Article

Publication date: November 1, 1983

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  • The Journal of Marine Research, one of the oldest journals in American marine science, publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. Biological studies involving coupling between ecological and physical processes are preferred over those that report systematics. The editors strive always to serve authors and readers in the academic oceanographic community by publishing papers vital to the marine research in the long and rich tradition of the Sears Foundation for Marine Research. We welcome you to the Journal of Marine Research.
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