Plant and algal toxicity of persistent free radicals and reactive oxygen species generated by heating anthracene contaminated soils from 100 to 600 °C - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Environmental Chemistry Letters Année : 2021

Plant and algal toxicity of persistent free radicals and reactive oxygen species generated by heating anthracene contaminated soils from 100 to 600 °C

Résumé

Persistent free radicals (PFRs) are emerging contaminants of increasing concern, yet their formation, fate, toxicity and health risk are poorly known. Thermal treatment, a common remediation technique to clean industrial soils, induces the formation of PFRs, which could paradoxically increase soil toxicity, contrary to the original objective of remediation. Actually, there is little knowledge on the formation and toxicity of PFRs in soils contaminated by polycyclic aromatic hydrocarbons (PAHs). Here we studied the generation of PFRs of soils spiked with anthracene and heated 1 h from 100 to 600 °C, using electron paramagnetic resonance. We also investigated the formation of reactive oxygen species (ROS), e.g. superoxide radical (O2•−), hydrogen peroxide (H2O2) and hydroxyl radical (•OH), in the aqueous phase of thermal-treated soil, and the impact of heating on soil oxidative potential, wheat growth and green algae activity. Results showed that PFRs, ROS, soil oxidative potential, plant toxicity and algal toxicity show a similar trend with an increase from 100 to 300 °C, followed by a decrease to 600 °C. Scavenger trapping tests reveal that algal toxicity is mainly due to the generation of O2•− , •OH and H2O2 induced by anthracene-PFRs and that anthracene and anthracene-PFRs have negligible direct algal toxicity. Overall, our findings reveal the unintended formation of toxic compounds peaking at 300 °C during the thermal remediation of PAHcontaminated soils. These results should help to assess the environmental risk of thermally treated PAH-contaminated soils.
Fichier principal
Vignette du fichier
Liu-Plant2021revised.pdf (476.27 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03260000 , version 1 (14-06-2021)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Jinbo Liu, Ning Gao, Xin Wen, Hanzhong Jia, Eric Lichtfouse. Plant and algal toxicity of persistent free radicals and reactive oxygen species generated by heating anthracene contaminated soils from 100 to 600 °C. Environmental Chemistry Letters, 2021, 19 (3), pp.2695 - 2703. ⟨10.1007/s10311-021-01193-z⟩. ⟨hal-03260000⟩
79 Consultations
119 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More