Transformation of organo-ferric peat colloids by a heterotrophic bacterium
| Autor: | Olga Yu. Drozdova, Oleg S. Pokrovsky, Olga V. Oleinikova, Sergey A. Lapitskiy, Andrey Yu. Bychkov, Emmanuele Gérard, Liudmila S. Shirokova |
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| Rok vydání: | 2017 |
| Předmět: |
Total organic carbon
010504 meteorology & atmospheric sciences Trace element chemistry.chemical_element 010501 environmental sciences 01 natural sciences Mineralization (biology) chemistry.chemical_compound Adsorption chemistry Geochemistry and Petrology Environmental chemistry Dissolved organic carbon medicine Ferric Hydroxide Carbon 0105 earth and related environmental sciences medicine.drug |
| Zdroj: | Geochimica et Cosmochimica Acta. 205:313-330 |
| ISSN: | 0016-7037 |
| Popis: | Bacterial mineralization of allochthonous (soil) dissolved organic matter (DOM) in boreal waters governs the CO 2 flux from the lakes and rivers to the atmosphere, which is one of the main factor of carbon balance in high latitudes. However, the fate of colloidal trace element (TE) during bacterial processing of DOM remains poorly constrained. We separated monoculture of Pseudomonas saponiphila from a boreal creek and allowed it to react with boreal Fe-rich peat leachate of approximate colloidal (3 kDa–0.45 µm) composition C 1000 Fe 12 Al 3.3 Mg 2 Ca 3.7 P 1.2 Mn 0.1 Ba 0.5 in nutrient-free media. The total net decrease of Dissolved Organic Carbon (DOC) concentration over 4 day of exposure was within 5% of the initial value, whereas the low molecular weight fraction of C org (LMW kDa ) yielded a 16%-decrease due to long-term bio-uptake or coagulation. There was a relative depletion in Fe over C org of 0.45 µm, colloidal and LMW fraction in the course of peat leachate interaction with P. saponiphila . Al, Mn, Ni, Cu, Ga, REEs, Y, U were mostly affected by bacterial presence and exhibited essentially the adsorption at the cell surface over first hours of reaction, in contrast to Fe, Ti, Zr, and Nb that showed both short-term adsorption and long-term removal by physical coagulation/coprecipitation with Fe hydroxide. The low molecular weight fraction (LMW kDa ) of most TE was a factor of 2–5 less affected by microbial presence via adsorption or removal than the high molecular weight (HMW) colloidal fractions ( |
| Databáze: | OpenAIRE |
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