【摘要】 以长江重庆段水体12个采样断面4种邻苯二甲酸酯(PAEs)的监测结果及水生生物的生态毒性参数无观察效应浓度(NOEC)为基础资料,采用安全阈值和概率曲线分布两种概率风险评价方法分析了邻苯二甲酸酯的相对生态风险。研究结果表明:邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸正丁酯(DBP)、邻苯二甲酸双(2-乙基己基)酯(DEHP)的安全阈值分别为4 310.79、21.71、1.47、1.99,对水生生物无风险。以5%水生生物物种受影响作为可接受的效应水平终点(HC5),采用概率曲线分布进行分析,DBP、DEHP的浓度超过毒性值的风险概率分别为1.06×10-2、2.35×10-4,4种邻苯二甲酸酯风险大小依次为:DBP>DEHP>DEP>DMP,与安全阈值法结果一致。两种概率风险方法从不同的角度反映了污染物的生态风险。更多还原

【Abstract】 Based on the observed PAEs concentration of 12 sampling sections from the area and No Observed Effect Concentrations(NOEC)of PAEs to aquatic organism species from the EPA database,two approaches were applied and evaluated for probabilistic risk assessment of 4 Phthalate Acid Esters(PAEs)in the Yangtze River of Chongqing section.It was found that 10% of the safety margin value were 4 310.79,21.71,1.47,1.99 for Dimethyl ester(DMP),Diethyl ester(DEP),Dibutyl ester(DBP),bis(2-Ethylhexyl)ester(DEHP),respectively,which indicated non-potential ecological risk for aquatic organism.In addition,application of probability distribution curves in the basic safety margin value and using HC5(hazardous concentration for 5% of species)as the endpoint of effect levels,the probability of exceeding an exposure concentration for DBP and DEHP were 1.06×10-2 and 2.35×10-4 respectively.Furthermore,associated with this specific probability of effects,4 individual PAEs followed the order of DBP>DEHP>DEP>DMP,which was in accordance with the method of margin of safety.Two kinds of probabilistic risk methods reflected the ecological risks of Phthalate Acid Esters from different angles.更多还原