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Ecotoxic effect in Allium cepa due to sphalerite weathering arising in calcareous conditions

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Abstract

The ecotoxic effect of Zn species arising from the weathering of the marmatite-like sphalerite ((Fe, Zn)S) in Allium cepa systems was herein evaluated in calcareous soils and connected with its sulfide oxidation mechanism to determine the chemical speciation responsible of this outcome. Mineralogical analyses (X-ray diffraction patterns, Raman spectroscopy, scanning electron microscopy and atomic force microscopy), chemical study of leachates (total Fe, Zn, Cd, oxidation–reduction potential, pH, sulfates and total alkalinity) and electrochemical assessments (chronoamperometry, chronopotentiometry, cyclic voltammetry, and electrochemical impedance spectroscopy) were carried out using (Fe, Zn)S samples to elucidate interfacial mechanisms simulating calcareous soil conditions. Results indicate the formation of polysulfides (Sn2−), elemental sulfur (S0), siderite (FeCO3)-like, hematite (Fe2O3)-like with sorbed CO32− species, gunningite (ZnSO4·H2O)-like phase and smithsonite (ZnCO3)-like compounds in altered surface under calcareous conditions. However, the generation of gunningite (ZnSO4·H2O)-like phase was predominant bulk-solution system. Quantification of damage rates ranges from 75 to 90% of bulb cells under non-carbonated conditions after 15–30 days, while 50–75% of damage level is determined under neutral-alkaline carbonated conditions. Damage ratios are 70.08 and 30.26 at the highest level, respectively. These findings revealed lower ecotoxic damage due to ZnCO3-like precipitation, indicating the effect of carbonates on Zn compounds during vegetable up-taking (exposure). Other environmental suggestions of the (Fe, Zn)S weathering and ecotoxic effects under calcareous soil conditions are discussed.

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Acknowledgements

This work has been partially supported by the Science and Technology Council of the State of Durango (COCYTED), through the STEM-2021-977 project and by Promotion of Applied Research with Character of Regional Development and Social, Environmental and Economic Relevance Program, through the 24450 project number. Fabiola S. Sosa-Rodríguez acknowledges the support from SECTEI through project No. 2284c23, “Monitoreo de la calidad del agua en los sistemas de captación de agua de lluvia (SCALL) y evaluación del programa de cosecha de agua de lluvia en la Ciudad de México”. The authors appreciate the contributions from Ing. Erasmo Mata Martínez (IG-UASLP) for sphalerite samples obtaining, conditioning and preparation for mineralogical analyses; to Dr. Angel G. Rodríguez (CIACYT-UASLP), and Dr. Jaime C. Rojas-Montes (CONAHCYT-TecNM/ITD) for Raman spectroscopy and XRD facilities, respectively. We are specially indebted with Dr. Manuel Dossot from LCPME-Université de Lorraine due to important comments to strength Raman interpretation. Hugo Ramírez-Aldaba thanks to CONAHCYT for his postdoctoral fellowship (grant number 4766117).

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RHL and JV-A contributed to the methodology, resources, software, funding, supervision, investigation and conceptualization, writing—original draft and review analysis, and project administration. FSS-R, PP-P, ARL-O, and GAA-V were involved in the methodology, supervision, resources and investigation. HR-A, MAG, GT, ER-B, and IL assisted in the formal analysis.

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Correspondence to Fabiola S. Sosa-Rodríguez or René H. Lara.

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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.

Novelty statement

There is a lack of studies regarding linkage between sphalerite weathering, including the effect of carbonates in the stability of secondary compounds, and the transitional stages of Zn (and Cd) bioaccumulation and exposure to plant systems in calcareous soil. The present work contributes to disclose these stages to better assess the transitory processes of Zn exposure to vegetable systems and ecotoxic damage rate affected by sphalerite weathering.

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Ponce-Peña, P., López-Ortega, A.R., Anguiano-Vega, G.A. et al. Ecotoxic effect in Allium cepa due to sphalerite weathering arising in calcareous conditions. Environ Geochem Health 46, 87 (2024). https://doi.org/10.1007/s10653-024-01857-z

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  • DOI: https://doi.org/10.1007/s10653-024-01857-z

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