Legacy and emerging per- and polyfluoroalkyl substances (PFASs) in multi-media around a landfill in China: Implications for the usage of PFASs alternatives
Legacy and emerging per- and polyfluoroalkyl substances (PFASs) in multi-media around a landfill in China: Implications for the usage of PFASs alternatives
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中国垃圾填埋场周围多媒体中的传统和新兴全氟烷基物质和多氟烷基物质 (PFAS)：对使用 PFAS 替代品的影响
DOI：
10.1016/j.scitotenv.2020.141767
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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;Zhaoyang Liu;Xin Song;Xiaoyan Ding;Da Ding
到目前为止，全氟和多氟烷基物质（PFASs）在周围的垃圾填埋场的环境介质没有引起太多的关注。在这项研究中，对六种传统全氟辛烷磺酸、六种短链类似物和五种新出现的替代品进行了调查，这些替代品取自一个山谷型垃圾填埋场附近的地下水、地表水和沉积物样本，该填埋场已经运行了20多年。地表水、地下水和沉积物样品中全氟辛烷磺酸的总浓度分别为110-236纳克/升、17.3-163纳克/升和7.91-164纳克/克干重。总体而言，全氟辛酸（PFOA）是地表水中占主导地位的PFAS，但在邻近垃圾填埋场的地表水样本中检测到全氟丁酸（PFBA）和全氟戊酸（PFPeA）浓度升高，这表明垃圾填埋场有助于这些化合物。PFBA是地下水和沉积物中的主要PFAS。沉积物样品中长链全氟烷基羧酸（PFCAs）（C8-C12）的含量与TOC、Al 2 O3和Fe 2 O3含量显著相关。PFCAs在水-沉积物体系中的分配行为因CF2结构单元的不同而异。对于长链PFCAs，平均LogKd和CF2基团数量之间的正相关性被发现具有统计学意义，而对于短链PFCAs（C4-C7）则观察到负相关性。地表水中短链类似物和新出现的替代品与其各自遗留的全氟辛酸和全氟辛烷磺酸的比例表明，全氟BA等短链类似物呈增加趋势。通过计算估计每日摄入量（EDI）确定的全氟辛烷磺酸和全氟辛酸的潜在健康风险，通过饮用地下水接触途径被发现可以忽略不计，但必须对来自垃圾填埋场的全氟辛烷磺酸的人类健康风险进行更全面的研究。
To date, per- and polyfluoroalkyl substances (PFASs) in environmental media surrounding landfills have not attracted much attention. In this study, six legacy PFASs, six short-chain analogues and five emerging alternatives were investigated in groundwater, surface water and sediment samples taken in the vicinity of a valley-type landfill, which had been in operation for over 20 years. Total PFAS concentrations of 110–236 ng/L, 17.3–163 ng/L and 7.91–164 ng/g dw were detected in the surface water, groundwater and sediment samples, respectively. Overall, perfluorooctanoic acid (PFOA) was the dominant PFAS in surface water, but elevated concentrations of perfluorobutanoic acid (PFBA) and perfluoropentanoic acid (PFPeA) were detected in the surface water samples taken adjacent to the landfill, suggesting that the landfill contributed to these compounds. PFBA was the dominant PFAS in the groundwater and sediments. The concentrations of long-chain perfluoroalkyl carboxylic acids (PFCAs) (C8–C12) in the sediment samples correlated significantly with the TOC, Al2O3and Fe2O3contents. The partitioning behaviors of PFCAs in the water-sediment system varied depending on the CF2moiety units. For the long-chain PFCAs, positive correlations between the average LogKdand the number of CF2moieties were found to be statistically significant, whereas negative correlations were observed for the short-chain PFCAs (C4–C7). The ratios of short-chain analogues and emerging alternatives versus their respective legacy PFOA and perfluorooctane sulfonate (PFOS) in surface water suggested an increasing trend of short-chain analogues, such as PFBA. The potential health risks of PFOS and PFOA, determined by calculating the estimated daily intake (EDI), were found to be negligible via the drinking groundwater exposure pathway, but more comprehensive studies on the human health risks of PFASs from landfills are essential.