ISSN 1615-9306 Development of an ionic liquid-based dispersive liquid–liquid micro-extraction method for the determination of phthalate esters in water samples (pages 1503–1507) Chen Sha, Zhong Yi-Sheng, Cheng Shui-Yuan, Qian Tian and Sun Hao Article first published online: 23 MAY 2011 | DOI: 10.1002/jssc.201000855 Hydrophilic interaction chromatography separation mechanisms of tetracyclines on ..