Updating risk remediation-endpoints for petroleum-contaminated soils? a case study in the Ecuadorian Amazon region

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dc.contributor.authorHidalgo-Lasso, Daniel
dc.contributor.authorGarcía-Villacís, Karina
dc.contributor.authorUlloa, Jeaneth Urvina
dc.contributor.authorTapia, Darwin Marín
dc.contributor.authorOrtega, Patricio Gomez
dc.contributor.authorCoulon, Frederic
dc.date.accessioned2024-05-02T13:00:48Z
dc.date.available2024-05-02T13:00:48Z
dc.date.issued2024-05-01
dc.description.abstractIn Ecuador, the regulatory framework for the remediation of petroleum-contaminated soils is based on predefined concentration endpoints for a selected range of petroleum hydrocarbon compounds. However, such approach may lead to over or under-estimation of the environmental risk posed by contaminated soils. In this study, the end-point remediation criteria according to Ecuadorian Environmental legislation were evaluated using different approaches. The first one was based on Total Extractable Petroleum Hydrocarbons (TEPH) and the second one on Total Bioavailable Petroleum Hydrocarbons (TBPH). Both were compared with ecotoxicological determinations using EC50 -Microtox® bioassay at 5 and 15 min of exposure. The correlation (R2) between EC50 values vs TEPH was of 0.2 and 0.25 for 5 and 15 min, respectively. Meanwhile, R2 between EC50 and TBPH was of 0.9 and 0.65 for 5 and 15 min, respectively, demonstrating a stronger correlation. Our results suggest that a contaminated site where the concentration of the TEPH is higher than the relevant regulatory concentrations may be deemed to present an acceptable risk even though their concentrations exceed the target values in soils. The results also challenge the notion that hormesis is associated with TEPH, contrary to some literature. This study is the first in Ecuador to propose incorporating bioavailability into environmental regulations, highlighting the need for further research to establish realistic and achievable remediation goals based on toxicity studies involving various trophic levels.en_UK
dc.identifier.citationHidalgo-Lasso D, García-Villacís K, Ulloa JU, et al., (2024) Updating risk remediation-endpoints for petroleum-contaminated soils? a case study in the Ecuadorian Amazon Region. Heliyon. Volume 10, Issue 9, May 2024, Article number e30395en_UK
dc.identifier.issn2405-8440
dc.identifier.urihttps://doi.org/10.1016/j.heliyon.2024.e30395
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21309
dc.language.isoen_UKen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectBioavailabilityen_UK
dc.subjectTotal extractable petroleum hydrocarbonsen_UK
dc.subjectTotal bioavailable petroleum hydrocarbonsen_UK
dc.subjectHydrocarbon-induced hormesisen_UK
dc.subjectPetroleumen_UK
dc.subjectOil-contaminationen_UK
dc.subjectRisk assessmenten_UK
dc.subjectEcuadorian Amazon regionen_UK
dc.titleUpdating risk remediation-endpoints for petroleum-contaminated soils? a case study in the Ecuadorian Amazon regionen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-04-25

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