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Einsiedl, F. ; Hertkorn, N. ; Wolf, M. ; Frommberger, M. ; Schmitt-Kopplin, P. ; Koch, B.P.*

Rapid biotic molecular transformation of fulvic acids in a karst aquifer.

Geochim. Cosmochim. Acta 71, 5474-5482 (2007)

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The study of molecular transformation processes of dissolved organic carbon (DOC) in the environment significantly contributes to a better understanding of the global biogeochemical organic matter cycle. In an oxic karst groundwater system, in which the most powerful abiotic DOC degradative reactions, photodegradation and metal-mediated redox chemistry, are at best marginal contributors, a near complete turnover of fulvic acids (FAs) has been observed within decades (not, vert, similar60 years). Depletion of oxygen for a very extensive range of aliphatic and aromatic carbon chemical environments has been confirmed as well as the formation of novel classes of compounds, suggesting a major contribution from biotic processes. From these results we infer that FAs must be perceived as a rather active participant in the global carbon cycle. Molecular-level alterations of such magnitude and rapidity on such short-time scales ought to be considered as widespread in the processing of “refractory” DOC in the environment.

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