Linking bioavailability and toxicity changes of complex chemicals mixture to support decision making for remediation endpoint of contaminated soils

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dc.contributor.authorCipullo, Sabrina
dc.contributor.authorNegrin, I.
dc.contributor.authorClaveau, Leila
dc.contributor.authorSnapir, Boris
dc.contributor.authorTardif, S.
dc.contributor.authorPulleyblank, C.
dc.contributor.authorPrpich, George
dc.contributor.authorCampo Moreno, Pablo
dc.contributor.authorCoulon, Frederic
dc.date.accessioned2018-10-09T10:03:23Z
dc.date.available2018-10-09T10:03:23Z
dc.date.issued2018-09-27
dc.description.abstractA six-month laboratory scale study was carried out to investigate the effect of biochar and compost amendments on complex chemical mixtures of tar, heavy metals and metalloids in two genuine contaminated soils. An integrated approach, where organic and inorganic contaminants bioavailability and distribution changes, along with a range of microbiological indicators and ecotoxicological bioassays, was used to provide multiple lines of evidence to support the risk characterisation and assess the remediation end-point. Both compost and biochar amendment (p = 0.005) as well as incubation time (p = 0.001) significantly affected the total and bioavailable concentrations of the total petroleum hydrocarbons (TPH) in the two soils. Specifically, TPH concentration decreased by 46% and 30% in Soil 1 and Soil 2 amended with compost. These decreases were accompanied by a reduction of 78% (Soil 1) and 6% (Soil 2) of the bioavailable hydrocarbons and the most significant decrease was observed for the medium to long chain aliphatic compounds (EC16–35) and medium molecular weight aromatic compounds (EC16–21). Compost amendment enhanced the degradation of both the aliphatic and aromatic fractions in the two soils, while biochar contributed to lock the hydrocarbons in the contaminated soils. Neither compost nor biochar affected the distribution and behaviour of the heavy metals (HM) and metalloids in the different soil phases, suggesting that the co-presence of heavy metals and metalloids posed a low risk. Strong negative correlations were observed between the bioavailable hydrocarbon fractions and the ecotoxicological assays suggesting that when bioavailable concentrations decreased, the toxicity also decreased. This study showed that adopting a combined diagnostic approach can significantly help to identify optimal remediation strategies and contribute to change the over-conservative nature of the current risk assessments thus reducing the costs associated with remediation endpoint.en_UK
dc.identifier.citationS. Cipullo, I. Negrin, L. Claveau, et al., Linking bioavailability and toxicity changes of complex chemicals mixture to support decision making for remediation endpoint of contaminated soils. Science of The Total Environment, Volume 650, Part 2, 10 February 2019, pp. 2150-2163en_UK
dc.identifier.cris21676068
dc.identifier.issn0048-9697
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2018.09.339
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13517
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectContaminated soilsen_UK
dc.subjectMixturesen_UK
dc.subjectBioavailabilityen_UK
dc.subjectToxicityen_UK
dc.subjectBioremediationen_UK
dc.titleLinking bioavailability and toxicity changes of complex chemicals mixture to support decision making for remediation endpoint of contaminated soilsen_UK
dc.typeArticleen_UK

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