Developing an understanding of dissolved organic matter dynamics in the giant Lake Baikal by ultrahigh resolution mass spectrometry

To elucidate the molecular characteristics of dissolved organic matter (DOM) in Lake Baikal, 3D excitation-emission matrix spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) were employed. From the linear relationship between the humic-like peak intensities (exc...

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Bibliographic Details
Published in:Limnology 2014-04, Vol.15 (2), p.127-139
Main Authors: Sugiyama, Yuko, Hatcher, Patrick G, Sleighter, Rachel L, Suzuki, Tomoyo, Wada, Chizuru, Kumagai, Tetsu, Mitamura, Osamu, Katano, Toshiya, Nakano, Shin-ichi, Tanaka, Yuji, Drucker, Valentin V, Fialkov, Vladimir A, Sugiyama, Masahito
Format: Article
Language:English
Subjects:
Aromatic compounds
Biomedical and Life Sciences
Dissolved organic carbon
Dissolved organic matter
Ecology
Emissions
Environment
Fourier transforms
Freshwater & Marine Ecology
Geochemistry
Lakes
Life Sciences
Limnology
Mass spectrometry
Photodegradation
principal component analysis
Principal components analysis
Research Paper
River mouth
Water analysis
Water sampling
watersheds
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Summary:To elucidate the molecular characteristics of dissolved organic matter (DOM) in Lake Baikal, 3D excitation-emission matrix spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) were employed. From the linear relationship between the humic-like peak intensities (excitation/emission = 305 nm/430 nm) and dissolved organic carbon (DOC) concentrations in the water samples extending from the Selenga River mouth to offshore (central lake in the south basin), allochthonous DOM appeared to be a main contributor to the DOC concentrations. However, DOM with fewer fluorophores dominated in the South Basin of the lake at stable DOC concentrations of ca. 0.84 mg C l⁻¹. Meanwhile, FT-ICR MS analysis and subsequent principal component analysis across the transect revealed a transition of compounds with high H-deficiency (aromatic) to compounds with low H-deficiency (aliphatic) that dominate pelagic open-lake water. We believe that this molecular change is induced by photo-degradation, which mainly alters aromatic compounds.
ISSN:1439-8621
1439-863X
DOI:10.1007/s10201-014-0424-5