About the Authors

Zhenyao Shen

zyshen@bnu.edu.cn

Affiliation State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China

Lei Chen

Affiliation State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China

Liang Xu

Affiliation State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Contributed to the work described in this paper and all take responsibility for it: ZYS LC LX. Conceived and designed the experiments: ZYS LC LX. Performed the experiments: ZYS LC LX. Analyzed the data: ZYS LC LX. Contributed reagents/materials/analysis tools: ZYS LC LX. Wrote the paper: LC.