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dc.contributor.authorPang, L.en
dc.contributor.authorClose, M. E.en
dc.contributor.authorNoonan, Michael J.en
dc.contributor.authorFlintoft, M.en
dc.contributor.authorVan den Brink, P.en
dc.date.accessioned2008-06-15T23:00:22Z
dc.date.issued2005en
dc.identifier.citationPang, L., Close, M. E., Noonan, M. J., Flintoft, M. J., & van den Brink, P. (2005). A laboratory study of bacteria-facilitated cadmium transport in alluvial gravel aquifer media. Journal of Environmental Quality, 34(1), 237-247.en
dc.identifier.issn0047-2425en
dc.identifier.urihttps://hdl.handle.net/10182/536
dc.description.abstractColloids, including bacteria, can dramatically accelerate the transport of heavy metals in ground water. Batch and column experiments were conducted to investigate adsorption of cadmium (Cd) onto Bacillus subtilis spores or Escherichia coli vegetative cells and Cd transport in alluvial gravel aquifer media in the presence of these bacteria. Results of the batch experiments showed that adsorption of Cd onto the bacteria was (i) positively related to solution pH, bacterial concentration, and negative surface charge, but inversely related to Cd concentration and (ii) a rate-limited nonlinear process, but adsorption onto E. coli was much less. For column influent Cd concentrations of about 4 mg/L and bacterial concentrations of ≥10⁵ colony-forming units (cfu)/mL, there was a significant increase in total Cd effluent concentrations. In comparison with controls that did not have bacteria-facilitated transport, Cd traveled 17 to 20 times faster when it traveled with mobile bacteria. However, Cd traveled mostly 2 to 3 times slower during the desorption phase under the influence of bacteria retained in the column. The difference between total and dissolved Cd concentrations was significant during Cd cotransport with B. subtilis spores, but this concentration difference was very small during Cd cotransport with E. coli, suggesting an adsorption-dominant mechanism during Cd cotransport with the spores and the possibility of Cd chelation by the dissolved membrane vesicles secreted from E. coli cell walls. Bacteria-facilitated transport of heavy metals may pose a threat to ground water quality in sites such as landfills and following land disposal of industrial and domestic effluent and sludge.en
dc.format.extent237-247en
dc.language.isoenen
dc.publisherAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of Americaen
dc.relationThe original publication is available from - American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America - https://doi.org/10.2134/jeq2005.0237en
dc.relation.urihttps://doi.org/10.2134/jeq2005.0237en
dc.rightsCopyright © 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of Americaen
dc.subjectcadmiumen
dc.subjectheavy metalsen
dc.subjectgroundwateren
dc.subjectbacteriaen
dc.subjectAgronomy & Agricultureen
dc.subject.meshBacillus subtilisen
dc.subject.meshEscherichia colien
dc.subject.meshSpores, Bacterialen
dc.subject.meshColloidsen
dc.subject.meshIndustrial Wasteen
dc.subject.meshSoil Pollutantsen
dc.subject.meshWater Pollutantsen
dc.subject.meshSoil Microbiologyen
dc.subject.meshAdsorptionen
dc.titleA laboratory study of bacteria-facilitated cadmium transport in alluvial gravel aquifer mediaen
dc.typeJournal Article
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300100 Soil and Water Sciencesen
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Wine, Food and Molecular Biosciencesen
dc.identifier.doi10.2134/jeq2005.0237en
dc.relation.isPartOfJournal of Environmental Qualityen
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/WFMB
pubs.publication-statusPublisheden
pubs.volume34en


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