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Stability of Ferrihydrite-Humic Acid Coprecipitates under Iron-Reducing Conditions.
Mejia, Jacqueline; He, Shaomei; Yang, Yu; Ginder-Vogel, Matthew; Roden, Eric E.
Afiliación
  • Mejia J; Department of Civil and Environmental Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
  • He S; Department of Geoscience , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
  • Yang Y; Department of Bacteriology , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
  • Ginder-Vogel M; Department of Civil and Environmental Engineering , University of Nevada-Reno , Reno , Nevada 89557 , United States.
  • Roden EE; Department of Civil and Environmental Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
Environ Sci Technol ; 52(22): 13174-13183, 2018 11 20.
Article en En | MEDLINE | ID: mdl-30354092
Recent studies have suggested the potential for release of iron (hydr)oxide-bound organic carbon (OC) during dissimilatory iron oxide reduction (DIR). However, the stability of iron (hydr)oxide-bound OC in the presence of a natural microbial consortium capable of driving both OC metabolism and DIR has not been resolved. Pure ferrihydrite (Fhy) and Fhy-humic acid coprecipitates (Fhy-HA) were inoculated with a small quantity of freshwater sediment and incubated under anoxic conditions in the presence and absence of H2 or glucose as electron donors for DIR. H2 promoted DIR led to release of ca. 1 mM dissolved organic carbon (DOC). However, comparable amounts of DOC were released from both pure Fhy and Fhy-HA, similar to DOC levels in mineral-free, inoculum-only controls. These results suggest that the observed DOC release during H2-promoted DIR originated from OC contained in the inoculum as opposed to the much larger pool (ca. 38 mM) of OC in the Fhy-HA. Thus, DIR preferentially released sorbed OC with low aromaticity (inoculum OC) versus highly aromatic OC (HA) coprecipitated with iron oxide. Our findings provide new insight into the extent and mechanisms by which DIR is likely to influence aqueous/solid-phase OC partitioning in anoxic soils and sediments.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Sustancias Húmicas Idioma: En Revista: Environ Sci Technol Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Sustancias Húmicas Idioma: En Revista: Environ Sci Technol Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos