HR: 14:40h
AN: B13G-05    [Abstracts]
TI: Organic Acid Concentrations in Rivers Within the Amazon River Drainage Basin
AU: * Skoog, A
EM: annelie.skoog@uconn.edu
AF: Department of Marine Sciences University of Connecticut, 1080 Shennecossett Road, Groton, CT 06360,
AB: The composition of the dissolved organic matter pool in both fresh and marine waters is largely unknown. Concentrations of low-molecular-weight organic acids (oxalate, citrate, glycolate, formate, acetate, succinate) have been determined in Brasilian (18 rivers sampled) and Peruvian (19 rivers sampled) rivers within the Amazon River drainage basin. Succinate concentrations were below the detection limit in all rivers. The dominant acid varied among the sampled rivers, indicating that organic acid concentrations depend on river basin characteristics. Organic-acid carbon comprised a highly significant, but variable, fraction of total dissolved carbon, with a range of 3-90%, indicating that organic-acid-derived carbon may be an important source of biologically labile carbon within the Amazon River drainage basin.
DE: 0428 Carbon cycling (4806)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting