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全氟烷基化合物(PFASs)作为一类新型有机污染物已被广泛关注.本研究采用固相萃取前处理与高效液相色谱串联质谱联用(HPLC-MS/MS)相结合的方法,测定了大连湾表层海水中的17种PFASs的含量,并对其污染水平以及分布进行了分析.各站位水样中均有PFASs检出,表明大连湾普遍存在PFASs的污染,∑PFASs浓度介于8.1 ～13.8 ng/L之间.其中,全氟辛酸(PFOA)、全氟丁酸(PFBA)和全氟丁基磺酸(PFBS)是目前大连湾表层水体中的主要PFASs污染物.短链物质正在逐渐成为主要的PFASs污染物,需引起重视.在污染分布上,受海水稀释扩散和潮流的影响,湾内PFASs污染高于湾外;但三山岛西部PFASs污染相对偏高,潜在污染源有待于进一步研究.“,”As a kind of emerging organic pollutants,perfluoroalkyl substances (PFASs) have attracted much attention of researchers.In the present study,17 kinds of PFASs in surface seawater samples from Dalian bay were measured with high performance liquid chromatography tandem mass spectrometry detector(HPLC-MS/MS) combined with solid-phase extraction pretreatment.Furthermore,the pollution level and distribution of PFASs were analyzed.PFASs were detected at all sites,indicating that PFASs were still ubiquitous in Dalian bay,and the total concentrations of PFASs ranged from 8.1 to 13.8 ng/L.Among them,perfluoronoctanoic acid (PFOA),perfluorobutanoic acid (PFBA) and perfluorobutane sulfonate (PFBS),are predominant PFASs pollutants in surface water samples from Dalian bay.Shortchain substances are gradually becoming the predominant PFASs pollutants,which needs more attention in the future.As for the pollution distribution,the concentrations of PFASs inside the Dalian bay are higher than those outside the bay due to the influence of the dilution and diffusion of seawater.However,the concentrations of PFASs at the west of Sanshan Island are relatively high and the potential pollution sources remain to be further studied.