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Dissolved Organic Matter Contribution to Seawater Alkalinity and its Molecular Level Information

Title
Dissolved Organic Matter Contribution to Seawater Alkalinity and its Molecular Level Information
Authors
Wu, Rui
Date Issued
2011
Publisher
포항공과대학교
Abstract
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.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000000899254
http://oasis.postech.ac.kr/handle/2014.oak/1073
Article Type
Thesis
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