Perfluorinated carboxylic acids discharged from the Yodo River Basin, Japan.
Perfluorinated carboxylic acids discharged from the Yodo River Basin, Japan.
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DOI：
10.1016/j.chemosphere.2015.05.060
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发表时间：
2015-11
期刊：
影响因子：
8.8
通讯作者：
Tamon Niisoe;S. Senevirathna;Kouji H. Harada;Y. Fujii;Toshiaki Hitomi;Hatasu Kobayashi;Junxia Yan;Can Zhao;Masayoshi Oshima;A. Koizumi
中科院分区：
文献类型：
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作者：
Tamon Niisoe;S. Senevirathna;Kouji H. Harada;Y. Fujii;Toshiaki Hitomi;Hatasu Kobayashi;Junxia Yan;Can Zhao;Masayoshi Oshima;A. Koizumi
我们于2013年调查了淀川系统中碳原子数为7-14（C7-C14）的全氟羧酸（PFCAs）。大多数采样点检测到C7-C11。全氟辛烷磺酸总浓度的范围和中位数分别为1.0-89.7和11.2纳克/升。主要成分是C8（所有样本的平均值= 53.3 ± 8.8%），其次是C7（19.2 ± 6.7%）和C9（17.6 ± 7.1%）。在过去10年中，C8的水平已证实大大下降。根据C7-C11在河水中的浓度和河流流速估算了该流域C7-C11的通量。在评估区域的最下游点，排放的全氟辛烷磺酸通量为237.0 g d− 1。考虑到降水造成的流速变化，全氟辛烷磺酸的年通量估计为86.5-173.4千克y−1。由于全氟化学品来源的强度随时间而变化，而且现有资料十分有限，因此很难对全氟化学品来源进行识别和量化。有必要进行进一步的监测和调查，以了解全氟化学品的来源及其对人类的潜在影响。
We investigated perfluorinated carboxylic acids (PFCAs) with 7–14 carbon atoms (C7–C14) in the Yodo River system in 2013. C7–C11 were detected at most sampling sites. The range and median of total PFCAs (ΣPFCAs) concentrations were 1.0–89.7 and 11.2 ng L−1, respectively. The dominant component was C8 (average for all samples = 53.3 ± 8.8%), followed by C7 (19.2 ± 6.7%) and C9 (17.6 ± 7.1%). The levels of C8 were confirmed to decrease greatly over the last 10 years. We assessed the fluxes in C7–C11 discharged from the basin based on the concentrations in river water and river flow rate. The flux of discharged ΣPFCAs was 237.0 g d−1at the most downriver point of the assessment areas. Considering the variability in flow rate due to precipitation, the annual ΣPFCAs flux was estimated to be 86.5–173.4 kg y−1. Identification and quantification of PFCAs sources is difficult because the strength of the sources changes with time, and available information is quite limited. Further monitoring and investigation are necessary to understand sources of PFCAs, as well as their potential for human exposure.