The pollution characteristics of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), and phthalate esters (PAEs) in the surface sediments of Xiaoxingkai Lake were analyzed by GC-MS, and the main sources and biological toxicity risks of the pollutants were discussed. The results show that:① The content of PAHs in the sediments of xiaoxingkai lake ranged from 82.1 to 534.6 ng·g-1, and the concentration of PAHs in the northwestern port of the lake was higher. The content of OCPs and PAEs in the sediments ranged from 4.8 to 50.4 ng·g-1 and 33.3 to 401.6 ng·g-1, respectively. The concentration was higher in the southeastern lakes. ② PAHs in the sediments were dominated by 3-5-ring compounds (accounting for more than 85%), which were mainly combustion sources, among which the combustion of coal and firewood contributed 47%, the combustion of gasoline and diesel contributed 39%, and the oil product leakage contributed 14%. The OCPs were mainly HCHs (78%) from the use of new lindane and the input of a small amount of industrial HCHs. The PAEs were mainly dibutyl phthalate (DBP) and diethyl phthalate (2-ethyl hexyl) ester (DEHP; 94%), which were mainly derived from household garbage and common human articles. ③ Compared with other lakes in China, PAHs and PAEs in the sediments of Xiaoxingkai Lake are at a low pollution level, and there is no ecological risk at present, but some OCPs at some points present a moderate ecological risk.
Keywords: Xiaoxingkai Lake; ecological risk; persistent organic pollutants(POPs); pollution characteristics; source analysis.