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Titel (primär) Bacterial communities in Bangladesh aquifers differing in aqueous arsenic concentration
Autor Sultana, M.; Härtig, C.; Planer-Friedrich, B.; Seifert, J.; Schlömann, M.;
Journal / Serie Geomicrobiology Journal
Erscheinungsjahr 2011
Department PROTEOM;
Band/Volume 28
Heft 3
Sprache englisch;
Keywords Arsenic contamination; Bangladesh; Microbial community analysis; T-RFLP; As(III) oxidation
Abstract At Titas, Bangladesh, two aquifers of different arsenic concentrations and redox conditions were investigated to link variations in geochemistry to in situ bacterial diversity characterized byT-RFLP 10 (terminal restriction fragment length polymorphism) and clone library analysis. Although the shallow aquifer was characterized by reduced gray sediments with a higher share of easily mobilized sedimentary arsenic (2.6% was easily mobilized from 18 mg/kg of total arsenic available in sediments) and higher aqueous arsenic 15 concentrations of 120 ± 6 ìg/L (45% arsenite), the deeper aquifer consisted of brown oxidized sediments with lower aqueous arsenic concentrations, predominantly as arsenate (60 ± 6 ìg/L; 3% arsenite)and a higher share of tightly bound arsenic (only 0.6% of 53 mg/kg total sorbed arsenic was easily mobilized). The bacterial 20 communities of both aquifers were dominated by putative aerobic or denitrifying populations of Pseudomonas, Elizabethkingia and Pantoea. The shallow aquifer was more diverse in bacterial populations of aerobic, facultative and anaerobic bacteria, an observation which may be correlated to more variable geochemical 25 conditions resulting in arsenic mobilization and re-sorption. The deeper aquifer showed higher abundance of aerobic bacterial populations including the presence of iron-oxidizing Sideroxydans possibly of importance for the sorption of arsenic on oxidized iron hydroxides. From the arsenic-affected shallow aquifer, As(III) ox30 idizing isolates of Comamonas and Microbacterium were obtained, which may provide information on suitable conditions for arsenic immobilization useful for future bioremediation efforts.
ID 10950
dauerhafte UFZ-Verlinkung
Sultana, M., Härtig, C., Planer-Friedrich, B., Seifert, J., Schlömann, M. (2011):
Bacterial communities in Bangladesh aquifers differing in aqueous arsenic concentration
Geomicrobiol. J. 28 (3), 198 - 211