Zur Kurzanzeige

dc.contributor.authorRajpert, Liwia
dc.contributor.authorSchäffer, Andreas
dc.contributor.authorLenz, Markus
dc.date.accessioned2018-11-26T09:53:19Z
dc.date.available2018-11-26T09:53:19Z
dc.date.issued2018
dc.identifier.urihttp://hdl.handle.net/11654/26757
dc.identifier.urihttp://dx.doi.org/10.26041/fhnw-1533
dc.description.abstractThe environmental fate of major (e.g. C, N, S, Fe and Mn) and trace (e.g. As, Cr, Sb, Se and U) elements is governed by microbially catalysed reduction-oxidation (redox) reactions. Mesocosms are routinely used to elucidate trace metal fate on the basis of correlations between biogeochemical proxies such as dissolved element concentrations, trace element speciation and dissolved organic matter. However, several redox processes may proceed simultaneously in natural soils and sediments (particularly, reductive Mn and Fe dissolution and metal/metalloid reduction), having a contrasting effect on element mobility. Here, a novel redox-stat (Rcont) bioreactor allowed precise control of the redox potential (159 ± 11 mV, ~ 2 months), suppressing redox reactions thermodynamically favoured at lower redox potential (i.e. reductive mobilisation of Fe and As). For a historically contaminated mining soil, As release could be attributed to desorption of arsenite [As(III)] and Mn reductive dissolution. By contrast, the control bioreactor (Rnat, with naturally developing redox potential) showed almost double As release (337 vs. 181 μg g−1) due to reductive dissolution of Fe (1363 μg g−1 Fe2+ released; no Fe2+ detected in Rcont) and microbial arsenate [As(V)] reduction (189 μg g−1 released vs. 46 μg g−1 As(III) in Rcont). A redox-stat bioreactor thus represents a versatile tool to study processes underlying mobilisation and sequestration of other trace elements as well.
dc.description.urihttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC6097752/
dc.language.isoen
dc.relation.ispartofApplied Microbiology and Biotechnology
dc.accessRightsAnonymous
dc.subjectArsenic remediation
dc.subjectRedox-stat bioreactor
dc.subjectTrace element fate
dc.titleRedox-stat bioreactors for elucidating mobilisation mechanisms of trace elements: An example of As-contaminated mining soils.
dc.type01 - Zeitschriftenartikel, Journalartikel oder Magazin
dc.volume102
dc.issue17
dc.audienceScience
fhnw.publicationStatePublished
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.InventedHereYes
fhnw.PublishedSwitzerlandNo
fhnw.IsStudentsWorkno
fhnw.publicationOnlineJa


Dateien zu dieser Ressource

Thumbnail

Der Eintrag erscheint in:

Zur Kurzanzeige