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Important But Overlooked Potential Risks of Substituted Polycyclic Aromatic Hydrocarbon: Looking Below the Tip of the Iceberg

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Abstract

Substituted polycyclic aromatic hydrocarbons (PAHs) are PAH derivatives in which substituents replace hydrogen atoms on the aromatic benzene ring, or N/S/O atoms replace carbon atoms in aromatic rings. Compared to unsubstituted PAHs, some substituted PAHs have higher pollution levels and more significant toxicity than their parent PAHs (p-PAHs), and the International Agency for Research on Cancer (IARC) lists them as possible human carcinogens, which harm human health but lack sufficient examination. This paper summarizes and discusses the environmental occurrence and distribution, toxicity, and impacts of substituted PAHs on human health and compares with the 16 representative priority-controlled PAHs (PAHs16). According to occurrence of PAHs in various environmental media, it is shown that the mean concentration of individual substituted PAH in the air is higher than that of individual PAH16. The mean concentration of individual substituted PAH in the soil varies widely among different countries, with a difference of 100,000 times between the lowest level (Italy) and the highest level (USA). The mean individual alkylated PAH (APAHs) and oxygenated PAH (OPAHs) are the most abundant in surface water and sediments. In the aspect of toxicity effects, some substituted PAHs have been proved to have similar or identical toxicity as PAHs16. We summarize existing problems and propose future priority research areas through the analysis of the occurrence and toxicity of substituted PAHs in the environment, which is important for further research and regulation of substituted PAHs.

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Acknowledgements

This work was financially supported by the National Science Foundation of China (Grant Numbers 41925031, 41991315, 42107461 and 41521003) and China Postdoctoral Science Foundation (Grant Number 2021M703047).

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XZ: conceptualization, project administration, funding acquisition. XZ: methodology, processing information, analyzing the data, writing the manuscript. XW: conceptualization, writing—review & editing. ZT, WL, XW, and JW: investigation. XW and LN: review the manuscript.

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Correspondence to Xiaoli Zhao.

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The authors declare that we have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhang, X., Wang, X., Zhao, X. et al. Important But Overlooked Potential Risks of Substituted Polycyclic Aromatic Hydrocarbon: Looking Below the Tip of the Iceberg. Reviews Env.Contamination (formerly:Residue Reviews) 260, 18 (2022). https://doi.org/10.1007/s44169-022-00021-x

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  • DOI: https://doi.org/10.1007/s44169-022-00021-x

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