Aquatic Sciences Meeting, Albuquerque 2001

CS25 Organic Carbon Dynamics

Date: Wednesday, February 14, 2001, Time: 4:30:00 PM

Location: Acoma/Zuni/Tesuque

Satterberg, J, M, University of Washington, Seattle, USA, jsatterb@u.washington.edu

Arnarson, T, , University of Washington, Seattle, USA,

Keil, R, G, University of Washington, , USA,

Lessard, E, , University of Washington, Seattle, USA,

SORPTION STUDIES OF ORGANIC MATTER FROM VARIOUS PHYTOPLANKTON TO MULTIPLE MINERAL SURFACES

The organic remains of phytoplankton form a primary signature in sedimentary systems that allows for the evaluation of, and reconstruction of, past events. The integrity and comprehensiveness of this signal is determined, in part, by the interactions between organic matter and mineral. This study was designed to assess if the organic matter of different phytoplankton taxa (diatoms, dinoflagellates, and prymnesiophytes), sorb differently to sediments. An additional objective of this study was to evaluate the hypothesis that what determines the degree of adsorption is the sediment structure itself. Cytoplasm from four phytoplankton species, Phaeocystis sp., Gymnodinium sanguineum, Scrippsiella trochoidea and Ditylum brightwellii was repeatedly exposed to three minerals; montmorillonite, kaolinite and chlorite, in order to quantify sorption. Results indicat that the organic matter of various phytoplankton species absorbs differently to different sediments. The most reactive species also varies for each mineral. The total amount of organic matter adsorption also ranged, with montmorillonite being the most reactive sediment and kaolinite being the least reactive.

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Aquatic Sciences Meeting, Albuquerque 2001

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