北京市典型湖泊中对羟基苯甲酸酯类化合物污染特征

通过在冬季和春季分别采集北京市某典型湖泊11个点位的湖水样品，采用固相萃取-液相色谱-三重四极杆串接质谱法测定样品中14种对羟基苯甲酸酯类化合物（PBs），进而对该湖泊PBs的污染水平和分布特征进行分析。结果表明：湖水中共检出10种PBs，其中对羟基苯甲酸甲酯（MeP）和对羟基苯甲酸丙酯（ PrP）浓度较高，分别为24.8、44.8 ng/L；同一采样点检出的PBs浓度随季节性变化而变化，与冬季相比，氯代对羟基苯甲酸酯（氯代-PBs）在春季浓度偏低，冬季靠近污水处理厂排污口水样中，氯代-PBs浓度高于其他采样点；外来污水是湖水中PBs的主要来源，春季电厂排水口MeP浓度（24.8 ng/L）高于冬季（1.30 ng/L）。调查结果显示，该湖泊中PBs种类和浓度水平与其他国家地表水相比，属中等浓度水平，湖泊中PBs主要来源于周边污水排放，不同季节PBs浓度变化较大。

Pollution characteristic analysis of parabens compounds in typical lakes in Beijing

In order to study the pollution level and distribution characteristics of parabens (PBs) in lakes, the pollution status of 14 PBs in typical lakes in Beijing was investigated and analyzed. The water samples of a lake in Beijing were collected in both winter and summer, and detected by solid-phase extraction and liquid chromatography-triple quadrupole tandem mass spectrometry. The results showed that ten kinds of PBs were detected with high level in the lake, among which methylparaben (MeP, 24.8 ng/L) and propylparaben (PrP, 44.8 ng/L) were the dominant compounds. The concentrations of the target compounds detected at the same sampling site changed seasonally, and the concentrations of chlorinated parabens in spring were lower than those in winter. However, in the winter near the outlet of the wastewater treatment plant, the concentrations of chlorinated parabens were higher than those at other sampling sites. The external sewage was the main source of PBs in the lake water, and the concentration of MeP at the sampling site of the outlet of the power plant in spring (24.8 ng/L) was higher than that in winter (1.30 ng/L). The survey results showed that the species and concentration level of PBs in the lake were medium comparing with those reported in the researches of other nations. The pollution of PBs in the lake mainly came from the surrounding sewage discharge, and the concentration of PBs varied greatly in different seasons.