| 菲与纳米银对胶州湾表层沉积物反硝化作用的复合毒性效应评价 |
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| 引用本文： | 孙鹏飞,白洁,李岿然,白晓岩,田延昭,赵阳国.菲与纳米银对胶州湾表层沉积物反硝化作用的复合毒性效应评价[J].中国海洋大学学报(自然科学版),2020(1):104-114. |
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| 作者姓名： | 孙鹏飞 白洁 李岿然 白晓岩 田延昭 赵阳国 |
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| 作者单位： | 中国海洋大学环境科学与工程学院;中国海洋大学海洋环境与生态教育部重点实验室;中国海洋大学海洋生命学院 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项项目(2013ZX07202-007)资助~~ |
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| 摘 要： | 多环芳烃(PAHs)与纳米材料污染已对沉积物生态系统和人类生存环境构成严重威胁,其复合污染的毒性效应环境危害可能更大。为了深入探讨PAHs与纳米材料对近岸表层沉积物反硝化作用的复合毒性效应,本文选取位于胶州湾(JZB)的大沽河河口区(DRE)E站和湾内S站,分别以菲和纳米银代表PAHs和纳米材料,通过测定不同剂量单一及复合污染下沉积物反硝化潜势(PDA)的变化,结合浓度相加模型(CA)、独立作用模型(IA)和中效/联合指数等效图法(CI)三种复合毒性评价方法,评价菲和纳米银对沉积物反硝化潜势的复合毒性效应,并对评价方法进行了优选。结果表明,两种污染物浓度越高,对研究区域反硝化潜势的抑制作用越大。菲、纳米银单一及复合作用下对河口区沉积物反硝化潜势的EC50值分别为44.62、112.49和64.86 mg·kg-1,对湾内分别为61.79、147.05和96.18 mg·kg-1。菲单一作用对反硝化潜势的抑制效应强于纳米银,但复合污染的抑制效应更强。两种污染物对河口区的沉积物反硝化潜势抑制效应强于湾内,可能与河口区具有较高Eh和沉积物颗粒度及较低的pH、盐度和有机质含量有关。三种毒性效应评价方法的结果表明,菲和纳米银的复合污染对2个站位反硝化潜势的毒性效应均为协同作用,且对大沽河河口区的协同作用更强。此外,CI法对复合效应的预测结果比CA和IA法更为接近实际观测值,且CI不需要考虑污染物作用模式的限制,因此认为CI法更适用于评价混合污染对沉积物反硝化作用复合影响的效果。本研究结果表明,菲和纳米银会增强彼此对反硝化菌及反硝化功能的毒性效应,由此推断,PAHs和纳米材料在环境中同时存在时比其单独存在对沉积环境的危害更大。
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| 关 键 词： | 菲 纳米银 沉积物 反硝化作用 复合毒性 |
Assessment Combined Toxicity of Phenanthrene and Silver Nanoparticles to Denitrification of Surface Sediment from the Coastal Area of Qingdao |
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| SUN Peng-Fei,BAI Jie,LI Kui-Ran,BAI Xiao-Yan,TIAN Yan-Zhao,ZHAO Yang-Guo.Assessment Combined Toxicity of Phenanthrene and Silver Nanoparticles to Denitrification of Surface Sediment from the Coastal Area of Qingdao[J].Periodical of Ocean University of China,2020(1):104-114. |
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| Authors: | SUN Peng-Fei BAI Jie LI Kui-Ran BAI Xiao-Yan TIAN Yan-Zhao ZHAO Yang-Guo |
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| Institution: | (College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;The Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education,Qingdao 266100,China) |
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| Abstract: | The pollution of PAHs and nanometer materials had posed a serious threat to sediment ecology and human living environment. The environmental effects of combined pollution of PAHs and nanometer materials are worth for paying attention. To explore combined toxicity of PAHs and nanometer materials on denitrification of surface sediment from the coastal area, station E and S from DRE and JZB was selected. Besides, Phenanthrene and AgNPs were chosen as the representatives of PAHs and nanomaterials. The effects of both single and combined pollution of phenanthrene(Phe) and AgNPs in different concentrations on PDA of sediment were measured, and then the combined toxicity of Phe and AgNPs were analyzed by using the methods concentration addition model(CA), independence model(IA) and median-effect equation/combination index(CI), and the evaluation method was optimized. The results showed that PDA was decreased with the increasing of pollutant concentration. The EC50 of both single and combined pollution of Phe and AgNPs on PDA of DRE and JZB was 44.62, 112.49, 64.86 and 61.79, 147.05, 96.18 mg·kg-1 respectively. The inhibition effect of Phe on PDA was stronger than that of AgNPs, and their combined pollution was strongest. The inhibition effect of pollutant on PDA of DRE was stronger than that of JZB, as DRE has higher Eh, sediment grain size and lower pH, salinity and OM. The three evaluation methods had a good consistency result in the evaluation of combined toxicity effect of Phe and AgNPs, which showed a synergistic effect on PDA of both stations. The synergistic effect of DRE was stronger. In addition, the prediction results of combined effect by CI method were closer to the actual observation values than those by CA and IA methods. Since CI method need not to consider the limitation of action mode of pollutant, CI method was more effective and stronger to predict effects of combined pollution on sediment denitrification. Therefore, the combined exposure of Phe and AgNPs strengthen toxicity effects on denitrifiers and denitrification. It can be concluded that the co-exist of PAHs and nanomaterials in the environment could be more harmful to the sedimentary environment. |
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| Keywords: | phenanthrene silver nanoparticles sediment denitrification combined toxicity |
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