1. School of Chemistry and Environment; South China Normal University; Guangzhou 510006 Guangdong China
2. Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System; Guangzhou 510006 China
3. Shenzhen Center for Disease Control and Prevention; Shenzhen 518055 China
4. The Key Laboratory of Water and Air Pollution Control of Guangdong Province; South China Institute of Environmental Sciences; Guangzhou 510655 China