1. Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Jinan University, Guangzhou 510632, China
2. Guangzhou Hexin Instrument Co., Ltd., Guangzhou 510530, China
3. Tianjin Microdroplet Innovative Technology Co., Ltd., Tianjin 300192, China