Using L. minor and C. elegans to assess the ecotoxicity of real-life contaminated soil samples and their remediation by clay- and carbon-based sorbents.

Autor: Rivenbark KJ; Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, TX, USA; Department of Veterinary Physiology and Pharmacology, School of Veterinary Medicine, Texas A&M University, College Station, TX, USA., Fawkes LS; Department of Environmental and Occupational Health, University of Texas School of Public Health San Antonio at the University of Texas Health Science Center at San Antonio, TX, USA., Nikkhah H; Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, CT, USA; Center for Clean Energy Engineering, University of Connecticut, Storrs, CT, USA., Wang M; Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, TX, USA; Department of Veterinary Physiology and Pharmacology, School of Veterinary Medicine, Texas A&M University, College Station, TX, USA., Sansom GT; Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, TX, USA; Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, College Station, TX, USA., Beykal B; Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, CT, USA; Center for Clean Energy Engineering, University of Connecticut, Storrs, CT, USA., Wade TL; Geochemical & Environmental Research Group, Texas A&M University, College Station, TX, USA., Phillips TD; Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, TX, USA; Department of Veterinary Physiology and Pharmacology, School of Veterinary Medicine, Texas A&M University, College Station, TX, USA. Electronic address: tphillips@cvm.tamu.edu.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Apr 15; Vol. 347, pp. 123762. Date of Electronic Publication: 2024 Mar 11.
DOI: 10.1016/j.envpol.2024.123762
Abstrakt: Toxic substances, such as polycyclic aromatic hydrocarbons (PAHs) and heavy metals, can accumulate in soil, posing a risk to human health and the environment. To reduce the risk of exposure, rapid identification and remediation of potentially hazardous soils is necessary. Adsorption of contaminants by activated carbons and clay materials is commonly utilized to decrease the bioavailability of chemicals in soil and environmental toxicity in vitro, and this study aims to determine their efficacy in real-life soil samples. Two ecotoxicological models (Lemna minor and Caenorhabditis elegans) were used to test residential soil samples, known to contain an average of 5.3, 262, and 9.6 ppm of PAHs, lead, and mercury, for potential toxicity. Toxicity testing of these soils indicated that 86% and 58% of soils caused ≤50% inhibition of growth and survival of L. minor and C. elegans, respectively. Importantly, 3 soil samples caused ≥90% inhibition of growth in both models, and the toxicity was positively correlated with levels of heavy metals. These toxic soil samples were prioritized for remediation using activated carbon and SM-Tyrosine sorbents, which have been shown to immobilize PAHs and heavy metals, respectively. The inclusion of low levels of SM-Tyrosine protected the growth and survival of L. minor and C. elegans by 83% and 78%, respectively from the polluted soil samples while activated carbon offered no significant protection. These results also indicated that heavy metals were the driver of toxicity in the samples. Results from this study demonstrate that adsorption technologies are effective strategies for remediating complex, real-life soil samples contaminated with hazardous pollutants and protecting natural soil and groundwater resources and habitats. The results highlight the applicability of these ecotoxicological models as rapid screening tools for monitoring soil quality and verifying the efficacy of remediation practices.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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