硫酸盐
环境化学
微生物
硫酸铵
铵
污染物
化学
硫黄
硫代谢
微生物代谢
细菌
生物
有机化学
遗传学
作者
Huan Liu,Zhichao Hu,Meng Zhou,Huihui Zhang,Zheng Li,Hao Zhang,Jiajie Hu,Xiangwu Yao,Liping Lou,Chuanwu Xi,Lizhong Zhu,Xiangyang Xu,Ping Zheng,Baolan Hu
标识
DOI:10.1016/j.envpol.2020.114293
摘要
Haze pollution is inseparable from the transformation of air pollutants especially the ammonium and sulfate. Chemical and physical processes play important roles in this transformation. However, the role of microbial processes has rarely been studied. In this report, we applied the cultivation-independent metagenomic approach to study airborne microorganisms, investigating the potential microbial-catalyzed transformation of ammonium and sulfate in PM2.5 samples. Functional genes predict that airborne microorganisms have the potential to catalyze ammonium formation but not ammonium oxidation since no ammoxidation genes were identified. We also found that the frequency of sulfate-forming genes was 1.56 times of those for sulfate-reducing genes. It was speculated that microbial metabolisms in the atmosphere could contribute to the accumulation of ammonium and sulfate. With the increase of PM2.5 concentration, the frequency of functional genes and the relative abundance of genera which involved in nitrogen and sulfur metabolisms increased. That suggested air pollution was conducive to the microbial-mediated formation of ammonium and sulfate. Overall, our results provided evidence for the possible role of microbial processes in the air pollutant transformation and brought a new perspective for studying the formation of secondary air pollutants.
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