SELENIUM SPECIATION AND PARTITIONING WITHIN BURKHOLDERIA CEPACIA BIOFILMS FORMED ON α-AL2O3 SURFACES
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dc.contributor.author | Templeton A.S. | |
dc.contributor.author | Trainor T.P. | |
dc.contributor.author | Spormann A.M. | |
dc.contributor.author | Brown G.E. | |
dc.date.accessioned | 2021-12-29T04:38:01Z | |
dc.date.available | 2021-12-29T04:38:01Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5063929 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 19, 3547-3557 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33903 | |
dc.description.abstract | The distribution and speciation of Se within aerobic Burkholderia cepacia biofilms formed on α-Al2O3 (1-102) surfaces have been examined using grazing-angle X-ray spectroscopic techniques. We present quantitative information on the partitioning of 10-6 M to 10-3 M selenate and selenite between the biofilms and underlying alumina surfaces derived from long-period X-ray standing wave (XSW) data. Changes in the Se partitioning behavior over time are correlated with microbially induced reduction of Se(VI) and Se(IV) to Se(0), as observed from X-ray absorption near edge structure (XANES) spectroscopy.Selenite preferentially binds to the alumina surfaces, particularly at low [Se], and is increasingly partitioned into the biofilms at higher [Se]. When B. cepacia is metabolically active, B. cepacia rapidly reduces a fraction of the SeO32- to red elemental Se(0). In contrast, selenate is preferentially partitioned into the B. cepacia biofilms at all [Se] tested due to a lower affinity for binding to the alumina surface. Rapid reduction of SeO42- by B. cepacia to Se(IV) and Se(0) subsequently results in a vertical segregation of Se species at the B. cepacia/α-Al2O3 interface. Elemental Se(0) accumulates within the biofilm with Se(VI), whereas Se(IV) intermediates preferentially sorb to the alumina surface.B. cepacia/α-Al2O3 samples incubated with SeO42- and SeO32- when the bacteria were metabolically active result in a significant reduction in the mobility of Se vs. X-ray treated biofilms. Remobilization experiments show that a large fraction of the insoluble Se(0) produced within the biofilm is retained during exchange with Se-free solutions. In addition, Se(IV) intermediates generated during Se(VI) reduction are preferentially bound to the alumina surface and do not fully desorb. In contrast, Se(VI) is rapidly and extensively remobilized. | |
dc.title | SELENIUM SPECIATION AND PARTITIONING WITHIN BURKHOLDERIA CEPACIA BIOFILMS FORMED ON α-AL2O3 SURFACES | |
dc.type | Статья |
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