Effect of PAC (PAH & Polar-PAC) availability on terrestrial organisms’ ecotoxicity - Université de Lorraine Access content directly
Conference Papers Year : 2023

Effect of PAC (PAH & Polar-PAC) availability on terrestrial organisms’ ecotoxicity

Abstract

Historically contaminated sites have gained attention in recent decades. Some of them, e.g., former coking plants are contaminated by polycyclic aromatic compounds (PACs), including PAHs and polar-PACs (O/N/S-PACs). PACs are known to be toxic to soil organisms [1]. The exposure of terrestrial organisms to freshly contaminated soil with PAHs and polar-PACs demonstrated significant toxicity towards several organisms.However, for some soils sampled from historically contaminated sites exhibiting a higher PAC content, tests performed on earthworms have shown a limited impact on mortality rates [2]. As reported by several studies, in historically contaminated sites, PAC (bio)availability is generally limited. This phenomenon known as "aging" [3,4], is a main factor to consider in the evaluation of toxicity risk in soil contaminated by PAC [5]. In fact, for a refined estimation of the environmental risk and understanding of the impact of the PAC (bio)availability on toxicity, it is neccesery to combine a complete chemical characterization (total content and available fraction of PACs) and biological expositions [6]. This work aims to evaluate the toxicity of two aged coking plant soils by running bioassays on invertebrates and plants. The toxicity of these soils (low PAC availability) will be compared with the same soils previously treated (heating) to increase their PAC availibility. A pre-heating treatment was carried out in order to increase PAC availability [5], then the soil was extracted with dichloromethane (DCM) and the PACs (i.e., PAHs and O/N/S PACs) were quantified by GC-MS. As a second step, ecotoxicity tests were performed through limit assays using acute bioassays. The purpose of this step is to evaluate the earthworm viability rate and seed development of plants (seedling emergence and growth) and to highlight the importance of taking into account the availability factor. Results of this study showed that soils with identical physico-chemical properties but exhibiting contrasted levels of PAC availability induced different ecotoxic responses of terrestrial organisms, an increased availability leading to a much higher toxicity. These results pointed out the importance of considering the contamination availability parameter in risk assessment and not only the total contaminant concentration. References: [1] Wang et al. (2022) Environmental Challenges, 9, 100613. [2] Eom et al. (2007), Ecotoxicology and Environmental Safety, 67(2),190-205 [3] Fernández et al. (2005), Ecotoxicology and Environmental Safety, 62(2), 174-184 [4] Boulangé et al. (2019) Chemosphere 224: 437‑44. [5] Biache, C. et al. (2021) Talanta 228: 122235. [6] Juvonen et al. (2000), Ecotoxicology and Environmental Safety,47(2), 156-166
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Dates and versions

hal-04271332 , version 1 (06-11-2023)

Identifiers

  • HAL Id : hal-04271332 , version 1

Cite

Imane Aabbar, Coralie Biache, C. Cossu-Leguille, Clément Bojic, Catherine Lorgeoux, et al.. Effect of PAC (PAH & Polar-PAC) availability on terrestrial organisms’ ecotoxicity. SETAC EUROPE 33RD ANNUAL MEETING, Apr 2023, Dublin, Ireland. ⟨hal-04271332⟩
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