利用GC?MS测定了新乡市地表水中15种多环芳烃（ PAHs）的含量，分析了其组成特征，并通过安全阈值（ MOS10）法评价了新乡市地表水中PAHs的生态风险．结果表明，新乡市地表水中PAHs的含量为369—4248 ng·L，与国内其他河流相比，污染水平较高． PAHs的组成以3环和4环为主，分别占总量的41．3％和40．3％．新乡市地表水中单种 PAHs 对水生生物的生态风险大小依次为蒽（ Ant）＞菲（ Phe）＞芘（ Pyr）＞苯并[a]芘（BaP）＞荧蒽（Flua）＞芴（Flu）＞苊（Ace），其中Ant和Phe的暴露浓度超过影响10％水生生物的概率分别为30．2％和10．4％，具有潜在生态风险；Ace、Flu、Flua、Pyr和BaP的暴露浓度超过影响10％的水生生物的概率分别为0．85％、1．96％、4．26％、6．71％和5．69％，生态风险较低．联合生态风险评价结果表明，新乡市地表水中∑PAH7等效浓度超过影响10％水生生物的概率为43．7％，大于任何单种PAHs对水生生物的生态风险，主要河流的生态风险从大到小依次为金堤河（56．6％）＞共产主义渠（43．0％）＞天然文岩渠（16．4％）．
Concentrations of polycyclic aromatic hydrocarbons ( PAHs) in surface water collected from Xinxiang were determined using GC?MS. The composition characteristics of PAHs were analyzed and risks from individual PAHs and ∑PAH7 were quantified by Margin of Safety ( MOS10 ) . The results indicated that total concentrations of 15 PAHs ranged from 369—4248 ng·L-1, higher than those in other rivers of China. The profiles of PAHs showed that 3? and 4?ring PAHs was predominant, which accounted for 41.3%and 40.3%of the total, respectively. The ecological risk of individual PAHs was in the order of Ant>Phe>Pyr>BaP>Flua>Flu>Ace. The probabilities of Ant and Phe exceeding the 10th percentile of the toxicity data were 30. 2% and 10. 4%, respectively, indicating potential risks. However, the probabilities of Ace, Flu, Flua, Pyr and BaP in excess of the 10th percentile of the toxicity data were 0.85%, 1.96%, 4.26%, 6.71% and 5.69%, suggesting minimal risk to aquatic organisms. Additionally, the combined ecological risk of ∑PAH7 was significantly higher than that any of individual PAHs, and the probability of ∑PAH7 exceeding the 10th percentile of the toxicity data was 43.7%. The combined ecological risk of major rivers was in the order of Jindi River (56.6%)>Gongchanzhuyi River (43.0%) >Tianrenwenyan River (16.4%).
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