التفاصيل البيبلوغرافية
| العنوان: |
Tissue-specific distribution and bioaccumulation of perfluoroalkyl acids, isomers, alternatives, and precursors in citrus trees of contaminated fields: Implication for risk assessment. |
| المؤلفون: |
Liu, Zhaoyang1 (AUTHOR) zhaoyangliu@mail.hzau.edu.cn, Liu, Shun1,2 (AUTHOR), Xiao, Feng3 (AUTHOR), Sweetman, Andrew J.4 (AUTHOR), Cui, Qianqian5 (AUTHOR), Guo, Hao1 (AUTHOR), Xu, Jiayi1 (AUTHOR), Luo, Ziyao1 (AUTHOR), Wang, Mingxia1 (AUTHOR), Zhong, Linlin6 (AUTHOR), Gan, Jay7 (AUTHOR), Tan, Wenfeng1 (AUTHOR) |
| المصدر: |
Journal of Hazardous Materials. Mar2024, Vol. 465, pN.PAG-N.PAG. 1p. |
| مستخلص: |
The ingestion of fruits containing perfluoroalkyl acids (PFAAs) presents potential hazards to human health. This study aimed to fill knowledge gaps concerning the tissue-specific distribution patterns and bioaccumulation behavior of PFAAs and their isomers, alternatives, and precursors (collectively as per-/polyfluoroalkyl substances, PFASs) within citrus trees growing in contaminated fields. It also assessed the potential contribution of precursor degradation to human exposure risk of PFASs. High concentrations of total target PFASs (∑PFASs target , 92.45–7496.16 ng/g dw) and precursors measured through the total oxidizable precursor (TOP) assay (130.80–13979.21 ng/g dw) were found in citrus tree tissues, and short-chain PFASs constituted the primary components. The total PFASs concentrations followed the order of leaves > fruits > branches, bark > wood, and peel > pulp > seeds. The average contamination burden of peel (∑PFASs target : 57.75%; precursors: 71.15%) was highest among fruit tissues. Bioaccumulation factors (BAFs) and translocation potentials of short-chain, branched, or carboxylate-based PFASs exceeded those of their relatively hydrophobic counterparts, while ether-based PFASs showed lower BAFs than similar PFAAs in above-ground tissues of citrus trees. In the risk assessment of residents consuming contaminated citruses, precursor degradation contributed approximately 36.07% to total PFASs exposure, and therefore should not be ignored. [Display omitted] • The levels of ∑PFASs in order are leaves > fruits > branches in citrus tree tissues. • Bark generally shows higher levels of individual PFASs than the corresponding wood. • Peel contributes the most pollution burden of PFASs in the whole citrus fruit. • Long-chain PFASs, linear isomers, and PFEAs show lower BAFs in citrus tree tissues. • Ignoring precursor degradation potentials will underestimate exposure risks of PFASs. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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