Chlorophenol chemicals are one kind of the priority pollutants widely distributed in the waters of China. The ecological risks of a mixture of three chlorophenols (pentachlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol) in the main rivers in China were assessed by deriving the risk quotient for mixtures ( RQ. ) of chemicals with a similar mode of action. The RQm values of the chlorophenol mixtures in all the rivers were lower than 1. The value was the highest (0. 377) in the Yellow River, while the values in the Yangtze, Huaihe, Haihe and Songhua Rivers were 0. 055, 0. 039, 0. 035 and 0. 010, respectively. The values of RQ_ in the other rivers in China were lower than 0. 010. In general, the mixed ecological risks of the three chlorophenols to aquatic organisms were higher in the Northern rivers than in the Southern rivers in China.%氯酚类化合物是我国河流中广泛存在的一类优先控制污染物.利用基于相似作用模式的混合物风险商( RQm)的方法,对我国主要河流中五氯酚、2.4-二氯酚和2,4,6-三氯酚组成的混合物进行了生态风险评价.结果表明:我国河流中3种氯酚化合物的RQm均小于1.黄河中3种氯酚化合物的RQm最高为0.377,长江、珠江、淮河和松花江中3种氯酚化合物的RQm分别为0.055、0.039、0.035和0.010,其他河流的RQm均小于0.010.整体上看,我国北部河流3种氯酚化合物的RQm比南部河流高.
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