HR: 1340h
AN: OS33A-0993    [Abstracts]
TI: Molecular Characterization of the Refractory Components of Terrestrially-derived DOM in Marine and Freshwaters of Southern New Zealand
AU: * Peake, B M
EM: bpeake@uci.edu
AF: Univeristy of Otago, Department of Chemistry, Dunedin, OT 9054, New Zealand
AU: Gonsior, M
EM: mgonsior@chemistry.otago.ac.nz
AF: Univeristy of Otago, Department of Chemistry, Dunedin, OT 9054, New Zealand
AU: Cooper, W J
EM: wcooper@uci.edu
AF: University of Cal., Irvine, Dept. of Civ. Environ. Engr., Irvine, Ca 92697, United States
AU: Cooper, W T
EM: cooper@chemmail.chem.fsu.edu
AF: Florida State University, Dept. Chem. and Biochem., Tallahassee, FL 32306, United States
AB: The molecular composition of dissolved organic matter (DOM) in samples collected from a freshwater river in Doubtful Sound (167.0167 E, 45.4097 S) and along a transect extending from neritic water (170.7522 E, 45.7687 S) across the Subtropical Convergence (171.0273 E, 45.7818 S) into Subantarctic Surface Water (171.4125 E, 457976 S) have been measured using ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Approx. 600 molecular formulae have been identified which are common to these four very different water masses and attributed to the refractory portion of the DOM. These molecular formulae have been assigned to nine classes of homologous series containing only containing carbon, hydrogen and oxygen. We suggest that these nine compositionally related families represent specific lignin degradation products resulting from side-chain oxidation, demethylation and aromatic ring opening.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 1055 Organic and biogenic geochemistry
DE: 4806 Carbon cycling (0428)
DE: 4850 Marine organic chemistry (0470, 1050)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting