1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China
4. Nanjing Easysensor Environmental Technology Company, Limited, Nanjing 210018, P. R. China
5. International Network for Environment and Health, School of Geography and Archaeology, National University of Ireland, Galway H91 CF50, Ireland