Dispersive Liquid–Liquid Microextraction Combined with Microwave Demulsification for Determination of FAME Residuals in Biodiesel Wastewater. - Yu, Guo-Wei; Wang, Xia-Jun; Wang, Peng; Zhao, Yi-Ping; Nie, Jing; Li, Zu-Guang; Fang, Xiu-Gui; Lee, Maw-Rong (Journal of Chromatographic Science, 2020)