Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments
Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94% total soluble arsenic is sequestered by Fe(III)-(oxy)hydr...
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| Veröffentlicht in: | Chemosphere (Oxford) 2007-12, Vol.70 (2), p.329-336 |
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| creator | Gibney, Brian P. Nüsslein, Klaus |
| description | Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus
Dechloromonas in 16S rDNA clone libraries. |
| doi_str_mv | 10.1016/j.chemosphere.2007.05.094 |
| format | Article |
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After amendment with nitrate, >94% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus
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| subjects | Applied sciences Arsenic - analysis Arsenic sequestration Betaproteobacteria - growth & development Biodegradation, Environmental Biogeochemistry Biological and physicochemical properties of pollutants. Interaction in the soil DNA, Bacterial - analysis DNA, Ribosomal - analysis Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Fresh Water - analysis Fresh Water - microbiology Freshwater Geologic Sediments - analysis Geologic Sediments - microbiology Iron oxidation Massachusetts Microbial community Nitrate reduction Nitrates - analysis Oxidation-Reduction Pollution Pollution, environment geology RNA, Ribosomal, 16S - analysis Soil and sediments pollution Urbanization Water Microbiology Water Pollutants, Chemical - analysis |
| title | Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments |
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