Abstract
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous soil contaminants, and their bioaccessibility determines their environmental risks in contaminated land. In the present study, the residual concentrations of PAHs in the soils of two industrial sites were determined, and their bioaccessibility was estimated by the hydroxypropyl-β-cyclodextrin extraction (HPCD) extraction method. The results showed heavy PAH contamination at both site S1 (0.38–3342.5 mg kg−1) and site S2 (0.2–138.18 mg kg−1), of which high molecular weight (HMW) PAHs (4-, 5-, and 6-ring compounds) accounted for approximately 80%. The average bioaccessibility of PAHs at sites S1 and S2 was 52.02% and 29.28%, respectively. The bioaccessibility of certain PAH compounds decreased with increasing ring number of the molecule. Lower PAH bioaccessibility was detected in loamy and silty soil textures than in sandy soil. Moreover, among the soil properties, the dissolved organic matter, total organic carbon, total potassium, and total manganese concentrations had significant effects on the bioaccessibility of PAHs. The toxicity analysis showed that the composition and bioaccessibility of PAHs could affect their potential toxicity in soil. We suggest that bioaccessibility should be taken into consideration when assessing the toxicity of PAHs in soil, and more attention should be given to low-ring PAHs with high bioaccessibility.
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Acknowledgements
This study was financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC1801005), Youth Innovation Promotion Association, CAS (Grant No. 2021309), the National Natural Science Foundation of China (Grant Nos. 42107244, 42007136), and Jiangsu Environmental Science Program (Grant No. 2020001).
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Cao, H., Li, X., Qu, C. et al. Bioaccessibility and Toxicity Assessment of Polycyclic Aromatic Hydrocarbons in Two Contaminated Sites. Bull Environ Contam Toxicol 109, 592–599 (2022). https://doi.org/10.1007/s00128-022-03530-6
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DOI: https://doi.org/10.1007/s00128-022-03530-6