Low molecular weight α-hydroxy carboxylic and dicarboxylic acids in reducing marine sediments |
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| Authors: | Edward T Peltzer Jeffrey L Bada |
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| Institution: | Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, U.S.A.;Scripps Institution of Oceanography and Institute of Marine Resources University of California, San Diego La Jolla, CA 92093, U.S.A. |
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| Abstract: | The occurrence and distribution of low molecular weight α-hydroxy carboxylic and dicarboxylic acids was studied in reducing marine sediments collected in the Santa Barbara Basin and the Cariaco Trench. Four compounds were found to occur in both basin sediments: glycolic, lactic, oxalic and succinic acids. In general concentrations were low (? 1 μmol/g for the hydroxy acids and ? 100μmol/g for the dicarboxylic acids), and generally decreased with depth. Subsurface maxima were observed for lactate and succinate in the Santa Barbara Basin. Both the vertical profiles and lactate enantiomer ratios suggested microbial origin and control for the distribution of these compounds. A preliminary model for the microbial mediation of the early diagenesis of organic compounds in reducing marine sediments is presented. |
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