Occurrence,source identification,and risk assessment of organophosphate esters in sediments from the Qiandao Lake
The present study investigated the occurrence characteristics,pollution sources,and ecological risks of 16 organophosphate esters(OPEs)in 26 surface sediments of Qiandao Lake using dispersive solid-phase extraction,together with ultra-performance liquid chromatography-tandem mass spectrometry.The results indicated that,in the surface sediments of Qiandao Lake,12 OPEs were ubiquitous.Their total concentrations(∑OPEs)averaged at 8.8 ng·g-1 dry weight(dw),and ranged from 2.6 ng·g-1dw to 28.5 ng·g-1dw.TEHP,TCEP,TEP,and TCIPP were four individuals dominated in the surface sediments of Qiandao Lake,with average concentrations of 4.2,1.7,1.1,and 0.9 ng g-1dw,respectively.∑OPEs(11.2-28.5 ng·g-1dw)and ∑alkyl-OPEs(8.5-24.8 ngg-1dw)in the sediments from the Jiekou to Xiaojinshan section(the northwestern part of the lake)were significantly higher than those in other regions(∑OPEs:2.6-12.2 ng·g-1 dw;∑alkyl-OPEs:0.9-7.1 ng g-1dw),suggesting that the pollution level of OPEs in the sediments of the Jiekou-Xiaojinshan section were significantly higher than those of other areas.Principal component analysis further indicated that the primary sources of OPEs in the sediments of the Jiekou-Xiaojinshan section of Qiandao Lake were mainly contributed by upstream inflows from the Xin'an River.Potential point sources,including human settlements and boat docks,were also identified near Qiandao Lake Town.The ecological risk quotient values of OPEs in all sediment of Qiandao Lake were found low(＜0.1),indicating their low risk to the ecological environment.
万方数据
维普
