摘要
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(Ba P)>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Ba P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%）.
出处
《环境化学》
CAS
CSCD
北大核心
2015年第4期725-732,共8页
Environmental Chemistry
基金
国家自然基金项目(41103071,41373132)
河南省基础与前沿技术研究项目(122300410270)
河南省创新型科技人才队伍建设工程
河南省科技创新人才计划(134200510014)资助
关键词
多环芳烃
新乡市地表水
生态风险
安全阈值
polycyclic aromatic hydrocarbons, surface water from Xinxiang, ecological risk, MOS10.
