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Mixture toxicity study of two metal oxide nanoparticles and chlorpyrifos on Eisenia andrei earthworms

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Abstract

Co-exposure soil studies of pollutants are necessary for an appropriate ecological risk assessment. Here, we examined the effects of two-component mixtures of metal oxide nanoparticles (ZnO NPs or goethite NPs) with the insecticide chlorpyrifos (CPF) under laboratory conditions in short-term artificial soil assays using Eisenia andrei earthworms. We characterized NPs and their mixtures by scanning electron microscopy, atomic force microscopy, dynamic light scattering and zeta potential, and evaluated effects on metal accumulation, oxidative stress enzymes, and neurotoxicity related biomarkers in single and combined toxicity assays. Exposure to ZnO NPs increased Zn levels compared to control in single and combined exposure (ZnO NPs + CPF) at 72 h and 7 days, respectively. In contrast, there was no indication of Fe increase in organisms exposed to goethite NPs. One of the most notable effects on oxidative stress biomarkers was produced by single exposure to goethite NPs, showing that the worms were more sensitive to goethite NPs than to ZnO NPs. Acetylcholinesterase and carboxylesterase activities indicated that ZnO NPs alone were not neurotoxic to earthworms, but similar degrees of inhibition were observed after single CPF and ZnO NPs + CPF exposure. Differences between single and combined exposure were found for catalase and superoxide dismutase (goethite NPs) and for glutathione S-transferase (ZnO NPs) activities, mostly at 72 h. These findings suggest a necessity to evaluate mixtures of NPs with co-existing contaminants in soil, and that the nature of metal oxide NPs and exposure time are relevant factors to be considered when assessing combined toxicity, as it may have an impact on ecotoxicological risk assessment.

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Data Availability

The authors declare that the data supporting the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

AChE:

Acetylcholinesterase

BSA:

Bovine serum albumin

CES:

Carboxylesterase

CAT:

Catalase

CDNB:

Chlorodinitrobenzene

CPF:

Chlorpyrifos

DTNB:

5,5′ Dithiobis-2 nitrobenzoic acid

GST:

Glutathione-S-transferase

MO-NPs:

Metal oxide nanoparticles

NBT:

Nitro blue tetrazolium

NPs:

Nanoparticles

OP:

Organophosphate

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

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Acknowledgements

We want to thank Dr. Fabio Causin for the technical support provided during SOD activity measurements, Dr. Santiago Herrera for the technical support provided during AFM analysis and Dr. Paola Ondarza for constructive criticism of the manuscript.

Funding

This work was supported by research grants from Secretaría Nacional de Ciencia y Técnica -Universidad de Buenos Aires (UBACyT) N° 20020170100106BA and N° 20020170100743BA, Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) PICT 2010–00544 and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) PIP 2021–2023 N° 11220200100133CO.

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Authors

Contributions

Marcela I. Cáceres-Wenzel: Methodology, Investigation, Formal analysis, Writing- Original draft preparation, Writing- Reviewing & Editing; Florencia N. Bernassani: Investigation, Formal analysis, Writing- Original draft preparation, Julio S. Fuchs: Methodology, Conceptualization, Supervision; Eduardo Cortón: Supervision, Resources, Funding acquisition; Adriana C. Cochón: Conceptualization, Resources, Writing- Reviewing & Editing, Funding acquisition.

Corresponding author

Correspondence to Marcela I. Cáceres-Wenzel.

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All coauthors (Marcela I. Cáceres-Wenzel, Florencia N. Bernassani, Julio S. Fuchs, Eduardo Cortón and Adriana C. Cochón) have approved the manuscript and agreed with the submission.

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The authors have no relevant financial or non-financial interests to disclose.

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Cáceres-Wenzel, M.I., Bernassani, F.N., Fuchs, J.S. et al. Mixture toxicity study of two metal oxide nanoparticles and chlorpyrifos on Eisenia andrei earthworms. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33604-3

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  • DOI: https://doi.org/10.1007/s11356-024-33604-3

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