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Extracellular polymeric substances from Bacillus subtilis associated with minerals modify the extent and rate of heavy metal sorption.

Titelangaben

Mikutta, Robert ; Baumgärtner, Anja ; Schippers, Axel ; Haumaier, Ludwig ; Guggenberger, Georg:
Extracellular polymeric substances from Bacillus subtilis associated with minerals modify the extent and rate of heavy metal sorption.
In: Environmental Science & Technology. Bd. 46 (2012) Heft 7 . - S. 3866-3873.
ISSN 0013-936X
DOI: https://doi.org/10.1021/es204471x

Abstract

Extracellular polymeric substances (EPS) are an important source oforganic matter in soil. Once released by microorganisms, a portion may be sorbed tomineral surfaces, thereby altering the mineral̀sability to immobilize heavy metals. EPS fromBacillus subtilis were reacted with Ca-saturated bentonite and ferrihydrite in 0.01 M KCl atpH 5.0 to follow the preferential uptake of EPS-C, -N, and -P. The sorption kinetics ofPb2+, Cu2+, and Zn2+ to the resulting EPS-mineral composites was studied in single andbinary metal batch experiments ([metal]total = 50 μM, pH 5.0). Bentonite sorbed muchmore EPS-C (18.5 mg g−1) than ferrihydrite (7.9 mg g−1). During sorption, EPS werechemically and size fractionated with bentonite favoring the uptake of low-molecularweight components and EPS-N, and ferrihydrite selectively retaining high-molecularweight and P-rich components. Surface area and pore size measurements by N2 gasadsorption at 77 K indicated that EPS altered the structure of mineral-EPS associations byinducing partial disaggregation of bentonite and aggregation of ferrihydrite. Whereas mineral-bound EPS increased the extentand rate of Pb2+, Cu2+, and Zn2+ sorption for bentonite, either no effect or a decrease in metal uptake was observed forferrihydrite. The extent of sorption always followed the order Pb2+ > Cu2+ > Zn2+, which also prevailed in binary Pb2+/Cu2+systems. In consequence, sorption of EPS to different minerals may have contrasting consequences for the immobilization ofheavy metals in natural environments by inducing mineral-specific alterations of the pore size distribution and, thus, of availablesorption sites.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER104303
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 07 Aug 2015 06:59
Letzte Änderung: 07 Aug 2015 06:59
URI: https://eref.uni-bayreuth.de/id/eprint/17671