主题：【已应助】请帮忙查几篇英文文献，谢谢

1、【标题】Ultrasound-assisted emulsification microextraction method based on applying low density organic solvents followed by gas chromatography analysis for the determination of polycyclic aromatic hydrocarbons in water samples
【文献出处】Journal of Chromatography A, Volume 1216, Issue 39, 25 September 2009, Pages 6673-6679
【作者】Abolfazl Saleh, Yadollah Yamini, Mohammad Faraji, Mohammad Rezaee, Mahnaz Ghambarian
2、【标题】One-step in-syringe ionic liquid-based dispersive liquid–liquid microextraction
【文献出处】Journal of Chromatography A, Volume 1216, Issue 37, 11 September 2009, Pages 6459-6465
【作者】Marta Cruz-Vera, Rafael Lucena, Soledad Cárdenas, Miguel Valcárcel
3、【标题】Development of an ionic liquid based dispersive liquid–liquid microextraction method for the analysis of polycyclic aromatic hydrocarbons in water samples
【文献出处】Journal of Chromatography A, Volume 1216, Issue 36, 4 September 2009, Pages 6356-6364
【作者】Mª Teresa Pena, Mª Carmen Casais, Mª Carmen Mejuto, Rafael Cela
4、【标题】One-step extraction and derivatization liquid-phase microextraction for the determination of chlorophenols by gas chromatography–mass spectrometry
【文献出处】Journal of Chromatography A, Volume 1216, Issue 35, 28 August 2009, Pages 6267-6273
【作者】Xiaowei Wang, Lijuan Luo, Gangfeng Ouyang, Li Lin, Nora F.Y. Tam, Chongyu Lan, Tiangang Luan
5、【标题】Analysis of pesticide residues by fast gas chromatography in combination with negative chemical ionization mass spectrometry
【文献出处】Journal of Chromatography A, Volume 1216, Issue 35, 28 August 2009, Pages 6326-6334
【作者】Renáta Húšková, Eva Matisová, Svetlana Hrouzková, Ľubomír Švorc