主题：【已应助】请帮忙查几篇英文文献，谢谢

【序号】：1
【作者】：Hongyuan Yan, Xiaoling Cheng, Baomi Liu 
【题名】：Simultaneous determination of six phthalate esters in bottled milks using ultrasound-assisted dispersive liquid–liquid microextraction coupled with gas chromatography
【期刊】：Journal of Chromatography B
【年、卷、期、起止页码】：Volume 879, Issue 25, 1 September 2011, Pages 2507-2512

【序号】：2
【作者】：Xin Zhou, Xiao Shao, Jian-jun Shu, Ming-ming Liu, Han-lan Liu, Xiong-han Feng, Fan Liu
【题名】：Thermally stable ionic liquid-based sol–gel coating for ultrasonic extraction–solid-phase microextraction–gas chromatography determination of phthalate esters in agricultural plastic films
【期刊】：Talanta, 
【年、卷、期、起止页码】：Available online 8 December 2011,

【序号】：3
【作者】：Edmar Martendal, Eduardo Carasek
【题名】：A new approach based on a combination of direct and headspace cold-fiber solid-phase microextraction modes in the same procedure for the determination of polycyclic aromatic hydrocarbons and phthalate esters in soil samples
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】：1 April 2011, Pages 1707-1714

【序号】：4
【作者】：Hui Zhang, Xiaoqing Chen, Xinyu Jiang 
【题名】：Determination of phthalate esters in water samples by ionic liquid cold-induced aggregation dispersive liquid–liquid microextraction coupled with high-performance liquid chromatography
【期刊】：Analytica Chimica Acta
【年、卷、期、起止页码】：9 March 2011, Pages 137-142

【序号】：5
【作者】：Elif Tümay Özer, Şeref Güçer   
【题名】：Determination of some phthalate acid esters in artificial saliva by gas chromatography–mass spectrometry after activated carbon enrichment
【期刊】：Talanta,
【年、卷、期、起止页码】：15 April 2011, Pages 362-367