Distribution characteristics of 24 perfluorocarbons in Taipu River and sediments
In this study,the spatial and temporal distribution characteristics and distribution behavior of 24 kinds of perfluoroalkyl substances(PFASs)in the water environment of the Taipu River Basin were explored.Water samples and sediments from important points in the Taipu River Basin were collected in winter and summer.Solid-phase extraction,liquid-liquid extraction and high-performance liquid chromatography tandem mass spectrometry(HPLC/MS-MS)were employed to analyzed the target compounds.The results showed that the total mass concentration of PFASs in water ranged from 114.24 ng·L-1 to 168.62 ng·L-1.The dominant pollutants were perfluorobutyric acid(PFBA)and perfluorooctanoic acid(PFOA),with average concentrations of 24.92 ng·L-1 and 28.18 ng·L-1;In the sediment,PFASs ranged from 2.36 ng·g-1(dw)to 4.73 ng·g-1(dw).The dominant pollutants were perfluorodecanoic acid(PFUdA)and perfluoro dodecanoic acid(PFDoA),with average concentrations of 0.78 ng·g-1(dw)and 0.52 ng·g-1(dw).The results of water samples showed that the total concentration of PFASs does not fluctuate much among most points,only a sudden increase occurred at individual points.There was no obvious seasonal difference in PFASs in the Taipu River section,which is related to the low rainfall in this summer.The distribution behavior of PFASs in sediment water showed that the distribution coefficient of PFASs in sediment water is related to the content of total organic carbon(TOC)of the sediment,the carbon chain length of PFASs and the functional group structure of PFASs.Short chain PFASs mainly exists in water,while long chain PFASs mainly in sediments;Compared to perfluorocarboxylic acids(PFCAs),perfluorosulfonic acids(PFSAs)are more easily adsorbed to sediments.The analysis of the source of PFASs shows that the source of PFASs in the water body includes external input and point source discharge.In summer,PFASs in the river is mainly affected by long-distance atmospheric transmission,and in winter,it is related to industrial activities around the river.
perfluorocarbonsTaipu Riverspatial and temporal distributiondistribution coefficientsource resolution
NETL
NSTL
万方数据
