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Impacts of iron oxides on the toxicities of pentachlorophenol in sediments to the freshwater chironomid of Chironomus riparius

  • Sediments, Sec 2 • Physical and Biogeochemical Processes • Research Article
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Abstract

Purpose

Iron oxides are ubiquitous natural components in sediments and have been documented to play a prominent role in controlling the geochemical and environmental behavior of contaminants. However, the influence of iron oxides on the toxicity of contaminants in sediments has not been well illustrated. This study aims to investigate the impacts of iron oxides on the toxicity of pentachlorophenol (PCP), a historically used agrochemical and persistent organic pollutant, using the freshwater chironomid of Chironomus riparius.

Methods

Two representative iron oxides, goethite and hematite, were added (1%—5%, w/w) to PCP-spiked sediments. The 10-d median lethal concentration (LC50) values of PCP to C. riparius were measured by sediment toxicity tests. Speciation of iron oxides was conducted by analyzing amorphous iron oxides (Feo) and free iron oxides (Fed) in the sediments.

Results

Adding goethite into the sediments generally increased LC50 values, while hematite did not, probably because of the strong adsorption of PCP to goethite by electrostatic interactions. Neither Feo (p = 0.08 > 0.05) nor Fed (p = 0.97 > 0.05) had a significant relationship with LC50, whereas their ratio (Feo/Fed) positively correlated with LC50 (p = 0.03 < 0.05).

Conclusion

Goethite reduces the toxicity of PCP in the sediments, while hematite does not obviously change the toxicity. Elevated Feo/Fed values result in a decrease of the toxicity. This study highlights the important role of iron oxides in affecting the toxicity and the ecological risk of PCP in sediments.

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Data will be made available on request.

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Funding

This work was supported by Ministry of Science and Technology of the People’s Republic of China (2018YFC1801003, 2019YFC1804203), National Natural Science Foundation of China (NSFC 41991313, 21737003, 22111530176), Fundamental Research Funds for the Central Universities (Nankai University), and 111 Program of Ministry of Education of the People’s Republic of China (T2017002).

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Authors and Affiliations

Authors

Contributions

Conceptualization: Lingyan Zhu; Methodology: Yanfeng Zhang; Formal analysis and investigation: Yuanyuan Wang; Writing—original draft preparation: Yuanyuan Wang; Writing—review and editing: Yanfeng Zhang, Huijuan Chen; Funding acquisition: Lingyan Zhu.

Corresponding author

Correspondence to Yanfeng Zhang.

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Conflict of interest

The authors declare no competing interests.

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Responsible editor: Jan Schwarzbauer

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Wang, Y., Chen, H., Zhang, Y. et al. Impacts of iron oxides on the toxicities of pentachlorophenol in sediments to the freshwater chironomid of Chironomus riparius. J Soils Sediments 24, 464–472 (2024). https://doi.org/10.1007/s11368-023-03672-y

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  • DOI: https://doi.org/10.1007/s11368-023-03672-y

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