Occurrence, source apportionment, plant bioaccumulation and human exposure of legacy and emerging per- and polyfluoroalkyl substances in soil and plant leaves near a landfill in China
Occurrence, source apportionment, plant bioaccumulation and human exposure of legacy and emerging per- and polyfluoroalkyl substances in soil and plant leaves near a landfill in China
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中国垃圾填埋场附近土壤和植物叶子中遗留和新出现的全氟烷基和多氟烷基物质的发生、来源解析、植物生物累积和人类暴露
DOI：
10.1016/j.scitotenv.2021.145731
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发表时间：
2021
影响因子：
9.8
通讯作者：
Da Ding
中科院分区：
文献类型：
--
作者：
Chang Xu;Xin Song;Zhaoyang Liu;Xiaoyan Ding;Hong Chen;Da Ding
在这项研究中，17个遗留的和新兴的PFASs在一个谷型垃圾填埋场附近的土壤和植物叶片中进行了调查，该垃圾填埋场已经运行了20多年。土壤和叶片中Σ的含量分别为5.31~108ngdw和11.9~115ngdw，土壤和叶片中均以全氟丁酸为主。六氟环氧丙烷二聚酸(HFPO-DA)、6：2氯化聚氟醚磺酸(F-53B)和6：2氟调聚体磺酸(6：2 FTS)的浓度显著高于传统的全氟辛烷磺酸和全氟辛烷磺酸，表明新兴替代品在该地区得到了广泛应用。主成分分析、研究区相关工业活动的现场调查和非混合模型分析的综合方法定量地表明，生产消费品的工厂和垃圾填埋场是土壤中PFASs的主要来源，占检测到的PFASs总量的57%。ΣPFASs在叶片中的生物积累系数(BAFs)在0.37~8.59之间，樟叶中的BAFs较高。所有植物叶片中的log10BAFs均随单株全氟辛烷烃(C4-C8)碳链长度的增加而呈线性下降。HFPO-DA、F-53B和6：2 FTS的BAF值分别为0.01~3.39、0.04~6.15和0.01~6.33。EDI的人体健康风险评估显示，随着全氟辛烷磺酸碳链长度的增加(C4-C9)，其人体健康风险呈下降趋势，PFASs EDI表明有必要进一步研究食用蔬菜对人体健康的风险。
In this study, 17 legacy and emerging PFASs were investigated in soil and plant leaves near a valley-type landfill, which has been in operation for over 20 years. ΣPFASs concentrations ranged from 5.31 to 108 ng/g dw and 11.9 to 115 ng/g dw in the soil and leaf samples, respectively, and perfluorobutanoic acid (PFBA) was dominant in both soil and leaves. The concentrations of hexafluoropropylene oxide dimer acid (HFPO-DA), 6:2 chlorinated polyfluorinated ether sulfonic acid (F-53B) and 6:2 fluorotelomer sulfonic acid (6:2 FTS) were significantly higher than those of legacy PFOA and PFOS, indicating emerging alternatives were widely applied in the region. The integrated approach of PCA analysis, field investigation of relevant industrial activities in the study area, along with the Unmix model analysis quantitatively revealed that factories producing consumer products and the landfill were the major sources of PFASs in soil, accounting for 57% of total PFASs detected. Bioaccumulation factors (BAFs) of ΣPFASs in leaves varied from 0.37 to 8.59, and higher BAFs were found in camphor leaves. The log10BAFs in all plant leaves showed a linear decrease with increasing carbon chain lengths for individual PFCAs (C4–C8). The BAF values of HFPO-DA, F-53B and 6:2 FTS were 0.01–3.39, 0.04–6.15 and 0.01–6.33, respectively. The human health risk assessment of EDIs showed a decreasing trend with the increasing carbon chain lengths of PFCAs (C4–C9), and the PFASs EDI indicated further study on the human health risk via vegetable consumption be warranted.