主题：【已应助】请帮忙查几篇英文文献，谢谢

【序号】：1
【作者】：Tse-Tsung Ho, Chung-Yu Chen, Zu-Guang Li, Thomas Ching-Cherng Yang, Maw-Rong Lee 
【题名】：Determination of chlorophenols in landfill leachate using headspace sampling with ionic liquid-coated solid-phase microextraction fibers combined with gas chromatography–mass spectrometry
【期刊】：Analytica Chimica Acta
【年、卷、期、起止页码】：Volume 712, 27 January 2012, Pages 72-77

【序号】：2
【作者】：Ali Es-haghi, Masoud Baghernejad, Habib Bagheri
【题名】：In situ solid-phase microextraction and post on-fiber derivatization combined with gas chromatography–mass spectrometry for determination of phenol in occupational air
【期刊】：Analytica Chimica Acta
【年、卷、期、起止页码】：Available online 10 January 2012

【序号】：3
【作者】：Soheila Samadi, Hassan Sereshti, Yaghoub Assadi
【题名】：Ultra-preconcentration and determination of thirteen organophosphorus pesticides in water samples using solid-phase extraction followed by dispersive liquid–liquid microextraction and gas chromatography with flame photometric detection
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】： Volume 1219, 6 January 2012, Pages 61-65

【序号】：4
【作者】：Paulo de Morais, Teodor Stoichev, M. Clara P. Basto, M. Teresa S.D. Vasconcelos 
【题名】：Extraction and preconcentration techniques for chromatographic determination of chlorophenols in environmental and food samples
【期刊】：Talanta,
【年、卷、期、起止页码】：Available online 22 December 2011