Dissolved Organic Matter Contribution to Seawater Alkalinity and its Molecular Level Information
- Dissolved Organic Matter Contribution to Seawater Alkalinity and its Molecular Level Information
- Wu, Rui
- Date Issued
- Two species p. minimum (dinoflagellate) and s. costatum (diatom) are studied to evaluate the
contribution of dissolved organic matter to seawater alkalinity. Dissolved organic matter produced
from dinoflagellate contributes more than that from diatom to seawater alkalinity. During
phytoplankton incubation, there was ~70μmol/kg ΔAT (measured alkalinity subtract calculated
alkalinity) change due to dissolved organic matter from p. minimum and ~40μmol/kg for s.
costatum. The results suggest that dissolved organic matter from different classes of phytoplankton
have unique capacity of proton acceptance. Electrospray-ionization mass spectrometry (ESI-MS)
shows that the major contributors are from low molecular weights less than 600. Dissolved organic
matters with molecular weights at 149, 245, 299, 334 and 413 is the main causes of alkalinity
increase in a dinoflagellate species p. minimum, whereas in diatom species s. costatum they are 157,
204 and 281.
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