Investigating the use of iron reducing bacteria for the removal of arsenic from contaminated soils

Papassiopi, N; Vaxevanidou, K; Paspaliaris, I

dc.contributor.author	Papassiopi, N	en
dc.contributor.author	Vaxevanidou, K	en
dc.contributor.author	Paspaliaris, I	en
dc.date.accessioned	2014-03-01T01:19:04Z
dc.date.available	2014-03-01T01:19:04Z
dc.date.issued	2003	en
dc.identifier.issn	15677230	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15362
dc.subject	Arsenic	en
dc.subject	Contaminated soils	en
dc.subject	Ferrous arsenates	en
dc.subject	Iron reducing bacteria	en
dc.subject	Scorodite	en
dc.subject.other	arsenic	en
dc.subject.other	bioremediation	en
dc.subject.other	iron-reducing bacterium	en
dc.subject.other	soil pollution	en
dc.subject.other	Bacteria (microorganisms)	en
dc.subject.other	Desulfuromonas palmitatis	en
dc.title	Investigating the use of iron reducing bacteria for the removal of arsenic from contaminated soils	en
heal.type	journalArticle	en
heal.identifier.primary	10.1023/A:1023905128860	en
heal.identifier.secondary	http://dx.doi.org/10.1023/A:1023905128860	en
heal.publicationDate	2003	en
heal.abstract	Clean-up techniques, which were developed for removing cationic heavy metals from contaminated soils, are inappropriate for the metalloid As, which is a common and highly toxic pollutant. Because arsenic is mainly found associated with the hydrous ferric oxides of the soil, a possible mechanism for the mobilisation of this element is the reductive dissolution of Fe(III) oxyhydroxides. In this paper we investigate the possibility to mobilise arsenic, using the Fe(III)-reducing bacterium Desulfuromonas Palmitatis. The initial experiments were carried out using a crystalline ferric arsenate as model compound, i.e. scorodite (FeAsO4.2H2O). D. palmitatis was found able to reduce the trivalent iron of scorodite at a percentage of 80% within 16 days, but arsenic remained in the pentavalent state, and reprecipitated with Fe(II) in the form of low solubility ferrous arsenates. To avoid the precipitation of ferrous arsenates the subsequent experiments with soil were conducted by combining the reducing ability of D. palmitatis with the chelating strength of EDTA (ethylenediamine tetracetic acid), which can form strong aqueous complexes with Fe(II). Approximately 60% of Fe and 75% of As were recovered in the aqueous solution in the presence of EDTA, while in the simple biological treatment no Fe was dissolved and only a 3% of As was mobilised. © 2003 Kluwer Academic Publishers.	en
heal.journalName	Water, Air, and Soil Pollution: Focus	en
dc.identifier.doi	10.1023/A:1023905128860	en
dc.identifier.volume	3	en
dc.identifier.issue	3	en
dc.identifier.spage	81	en
dc.identifier.epage	90	en