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Effects of silver nanoparticles on nitrification and associated nitrous oxide production in aquatic environments
作者:刘敏  发表时间:2017-09-24  阅读次数:2766     发布者:19970040

题名:Effects of silver nanoparticles on nitrification and associated nitrous oxide production in aquatic environments
领域:Science & Technology 一区
来源:SCIENCE ADVANCES
发表年代:2017年
作者:Yanling Zheng, Lijun Hou*, Min Liu*, Silvia E. Newell, Guoyu Yin, Chendi Yu, Hongli Zhang, Xiaofei Li, Dengzhou Gao, Juan Gao, Rong Wang, Cheng Liu

Silver nanoparticles (AgNPs) are the most common materials in nanotechnology-based consumer products globally. Because of the wide application of AgNPs, their potential environmental impact is currently a highly topical focus of concern. Nitrification is one of the processes in the nitrogen cyclemost susceptible to AgNPs but the specific effects of AgNPs on nitrification in aquatic environments are not well understood. We report the influence of AgNPs on nitrification and associated nitrous oxide (N2O) production in estuarine sediments. AgNPs inhibited nitrification rates, which decreased exponentially with increasing AgNP concentrations. The response of nitrifier N2O production to AgNPs exhibited low-dose stimulation (<534, 1476, and 2473 μg liter−1 for 10-, 30-, and 100-nm AgNPs, respectively) and highdose inhibition (hormesis effect). Compared with controls, N2O production could be enhanced by >100% at low doses of AgNPs. This result was confirmed by metatranscriptome studies showing up-regulation of nitric oxide reductase (norQ) gene expression in the low-dose treatment. Isotopomer analysis revealed that hydroxylamine oxidationwas the main N2O production pathway, and its contribution to N2O emission was enhanced when exposed to low-dose AgNPs. This study highlights the molecular underpinnings of the effects of AgNPs on nitrification activity and demonstrates that the release of AgNPs into the environment should be controlled because they interfere with nitrifying communities and stimulate N2O emission.

 

 Effects of silver nanoparticles on nitrification and associated nitrous oxide production in aquatic environments