Effects of sliver nanoparticles on the coupled nitrification-denitrification in suspended sediments from Taihu Lake

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Miao, Lingzhan^1 ; Liu, Songqi^1

Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing

210098, China^1

关键词: Aquatic environments;    Freshwater ecosystem;    Isotope-tracer techniques;    Microbial communities;    Nitrification-denitrification;    Potential effects;    Silver nanoparticles (AgNps);    Sliver nanoparticles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/6/062011/pdf
DOI  :  10.1088/1755-1315/227/6/062011

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The widespread use of commercial silver nanoparticles (Ag NPs) inevitably results in their increasing release into natural waters and potentially threaten the freshwater ecosystems. During their migration, Ag NPs would interact with suspended sediments (SPS) and negatively affect the microbial communities on SPS, which play an important role in the nutrient cycling in aquatic environments. However, there is limited research focusing on the potential effects of Ag NPs on nitrogen cycling in SPS. In this study,15N isotope tracer technique (added15NH4 +) was adopted to explore the influences of different concentrations of Ag NPs on coupled nitrification-denitrification (CND) in SPS systems by determining the variation of added NH4 + and the final production of CND (15N-N2). The obtained results indicated that 10 and 5 mg/L Ag NPs inhibited the15N-N2 production of CND by decreasing the utilization of NH4 + in SPS, while 0.5 and 2 mg/L Ag NPs increased the activity of CND in SPS due to the hormesis effects. The study demonstrated the negative effects of Ag NPs on N-cycling in SPS systems and provided more evidences for evaluating the risks of Ag NPs in aquatic ecosystems.