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In situ fixation of metal(loid)s in contaminated soils : a comparison of conventional, opportunistic, and engineered soil amendments

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dc.contributor.authorMele, E.
dc.contributor.authorDonner, E.
dc.contributor.authorJuhasz, A.L.
dc.contributor.authorBrunetti, G.
dc.contributor.authorSmith, E.
dc.contributor.authorBetts, A.R.
dc.contributor.authorCastaldi, P.
dc.contributor.authorDeiana, S.
dc.contributor.authorScheckel, K.G.
dc.contributor.authorLombi, E.
dc.date.issued2015
dc.descriptionLink to a related website: https://www.osti.gov/biblio/1228097, Open Access via Unpaywall
dc.description.abstractThis study aimed to assess and compare the in vitro and in vivo bioaccessibility/bioavailability of As and Pb in a mining contaminated soil (As, 2267 mg kg-1; Pb, 1126 mg kg-1), after the addition of conventional (phosphoric acid), opportunistic [water treatment residues (WTRs)], and engineered [nano- and microscale zero valent iron (ZVI)] amendments. Phosphoric acid was the only amendment that could significantly decrease Pb bioaccessibility with respect to untreated soil (41 and 47% in the gastric phase and 2.1 and 8.1% in the intestinal phases, respectively), giving treatment effect ratios (TERs, the bioaccessibility in the amended soil divided by the bioaccessibility in the untreated soil) of 0.25 and 0.87 in the gastric and intestinal phase, respectively. The in vivo bioavailability of Pb decreased in the phosphate treatment relative to the untreated soil (6 and 24%, respectively), and also in the Fe WTR 2% (12%) and nZVI-2 (13%) treatments. The ZVI amendments caused a decrease in As bioaccessibility, with the greatest decrease in the nZVI2-treated soil (TERs of 0.59 and 0.64 in the gastric and intestinal phases, respectively). Arsenic X-ray absorption near-edge spectroscopy analysis indicated that most of the As in the untreated soil was present as As(V) associated with Fe mineral phases, whereas in the treated soil, the proportion of arsenosiderite increased. Arsenite was present only as a minor species (3-5%) in the treated soils, with the exception of an nZVI treatment [∼14% of As(III)], suggesting a partial reduction of As(V) to As(III) caused by nZVI oxidation.
dc.identifier.citationEnvironmental Science and Technology, 2015; 49(22):13501-13509
dc.identifier.doi10.1021/acs.est.5b01356
dc.identifier.issn0013-936X
dc.identifier.issn1520-5851
dc.identifier.urihttps://hdl.handle.net/11541.2/116365
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.fundingARC FT100100337
dc.relation.fundingItalian Ministry of Research and University (MIUR) PRIN 2010-11
dc.relation.fundingCRC CARE
dc.rightsCopyright 2015 American Chemical Society
dc.source.urihttps://doi.org/10.1021/acs.est.5b01356
dc.subjectmining contaminated soil
dc.subjectcontaminated drinking water
dc.subjectcontaminated drinking food
dc.titleIn situ fixation of metal(loid)s in contaminated soils : a comparison of conventional, opportunistic, and engineered soil amendments
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9915991710701831

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