1. Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 11754 Singapore
2. Food Laboratory, Centre of Analytical Sciences; Health Sciences Authority; 11 Outram Road Singapore 16907 Singapore
3. NUS Environmental Research Institute; 5A Engineering Drive 1, T-Lab Building Singapore 117411 Singapore
4. Shenzhen Engineering Laboratory for Eco-efficient Polysilicate Materials, School of Environment and Energy; Peking University Shenzhen Graduate School; Shenzhen 518055 P.R. China