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全氟化合物在岷江流域沉积物中的污染特征及生态风险评价
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摘要
目前,国内针对沉积物中的全氟化合物(PFASs)的调查研究集中在东南沿海发达地区,西南地区还尚未开展调查研究。本研究采用超声辅助萃取前处理方法,超高效液相色谱串联质谱分析了西南地区岷江流域表层沉积物中的全氟化合物的浓度水平。结果显示,岷江流域PFASs总浓度范围为n.d.~0.769 ng/g,其中PFBA、PFPe A、PFOA和PFOS是主要污染物。与国内外不同流域对比发现:岷江流域表层沉积物中PFOA和PFOS的浓度水平并不高。计算了全氟化合物对岷江流域的生态风险,结果显示,其风险墒值<1,暴露浓度低于对生态环境造成风险的水平。
Geographic areas about the concentration levels about perfluorinated compounds(PFASs) in sedments of different watershelds in China were mainly in the Southeast China and South China. Few studies in Sourthwest China were concerned. In this study, the concentration levels of PFASs in surface sediments of Minjiang River watersheld were conducted using ultrasound-assisted extraction followed by ultra-performance liquid chromatography tandem mass spectrometry. The results showed that total PFASs concentration in surface sediments of Minjiang River watersheld ranged from n.d to 0.769 ng/g. PFBA, PFPeA, PFOA and PFOS were the main detected PFASs. It is also found out that the levels of PFOA and PFOS in Minjiang River are not high compared with other rivers in China. Furthermore, ecological risk assessment was carried out according to calculate the entropy(the ratio of measured concentrations to predicted no-effect concentration)of PFOA and PFOS, and the results showed that the exposure concentration in sediment did not arrive to the ecological environment risks level.
引文
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