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Effects of Silver Nanoparticles on Denitrification and Associated N_(2)O Release in estuarine and marine sediments

Journal of Ocean University of China 2022年第1期21卷 131-140页

作者： SUN Pengfei LI Kuiran YI Shaokui LI Hui CHEN Xi Fourth Institute of Oceanography Ministry of Natural ResourcesBeihai 536000China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of marine Life Science Ocean University of ChinaQingdao 266003China College of Life Sciences Huzhou UniversityHuzhou 313000China

Silver nanoparticles(AgNPs)have been widely used in medicine and consumer *** it enters the river in dif-ferent ways,then finally converges to the ocean through the *** polution can affect NO_(2)−and N_(2)O production by denitri-fiers in aquatic *** effects of AgNPs on denitrification activity,nitrogen transformation and nitrous oxide(N_(2)O)emission were investigated in Dagu River Estuary(DRE)and Jiaozhou Bay(JZB).The results showed that the potential denitrification activity(PDA),NO_(3)−and NO_(2)−reduction rates decreased with an increase of AgNPs concentration in DRE and ***,the N_(2)O ac-cumulation was significantly increased at AgNPs concentrations above 5 mg kg^(−1)in both areas,and the accumulation rate was greater in estuary than in bay(P0.05)in DRE and ***,the relative abundance of narG,nirS and nosZ gene in two areas decreased with the increase of AgNPs concentration,and the negative effect of AgNPs varied in order:nosZ>nirS>narG,inferring that the expression of denitrifying related genes could be significantly and differently inhibited by AgNPs ***,this study demon-strated that the inhibitory effect of AgNPs on different denitrification process,which may lead to the increase of inorganic nitrogen accumulation and N_(2)O *** study provides a scientific basis for the further studies of AgNPs on the ecological impact mechanism and environmental effects of offshore sedimentary environment.

关键词： nitrous oxide silver nanoparticles denitrification estuarine and marine sediments

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