Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan.
Environ Sci Technol. 2011 Apr 1;45(7):2887-93. doi: 10.1021/es103917r. Epub 2011 Mar 8.
Pollution from 35 perfluorinated compounds (PFCs) in the water of the Tokyo Bay basin was examined. The water in the basin contained relatively high levels of perfluorononanoate (PFNA), perfluorooctanoate (PFOA), and perfluorooctane sulfonate (PFOS) compared to the other PFCs, which were present at concentrations of 20.1 ng/L, 6.7 ng/L, and 5.8 ng/L, respectively. In contrast, the concentrations of their precursors and degradation products were an order of magnitude lower. Sewage treatment plant (STP) effluent in the area also contained high levels of PFNA compared with the river water samples (Mann-Whitney U-test, p<0.0002). From a spatial aspect, increases in PFC pollution levels correlated with increased urbanization in the study area suggested that there are nonpoint source contributors to the PFC pollution in this area. Branched isomers of the PFCs were also quantified. Samples that contained high concentrations of perfluoroalkyl carboxylates (PFCA) showed lower proportions of its branched isomer. This indicates that the branched isomers are more prominent in the area with lower PFC pollution. This analysis was beneficial for estimating the individual contributions of different PFCA production processes. This survey provided new information on the sources, spatial distribution, and behavioral characteristics of PFC pollutants in this area.
检测了东京湾流域水中 35 种全氟化合物 (PFCs) 的污染情况。与其他 PFC 相比，该流域水中的全氟壬酸 (PFNA)、全氟辛酸 (PFOA) 和全氟辛烷磺酸 (PFOS) 含量相对较高，浓度分别为 20.1ng/L、6.7ng/L 和 5.8ng/L。相比之下，其前体和降解产物的浓度低一个数量级。该地区污水处理厂 (STP) 出水与河水样本相比，PFNA 含量也较高 (Mann-Whitney U 检验，p<0.0002)。从空间角度来看，研究区域内 PFC 污染水平的增加与城市化程度的提高相关，表明该区域的 PFC 污染存在非点源贡献。还对 PFC 的支链异构体进行了定量分析。高浓度全氟烷基羧酸 (PFCA) 的样本显示其支链异构体的比例较低。这表明在 PFC 污染较低的地区，支链异构体更为突出。该分析有助于估算不同 PFCA 生产过程的个体贡献。本调查提供了该地区 PFC 污染物的来源、空间分布和行为特征的新信息。
