主题：【已应助】请帮忙查几篇英文文献，谢谢

【序号】：6
【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】：7
【作者】：Shuo-Yang Wei, Mei-I Leong, Yee Li, Shang-Da Huang   
【题名】：Development of liquid phase microextraction based on manual shaking and ultrasound-assisted emulsification method for analysis of organochlorine pesticides in aqueous samples
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】：Volume 1218, Issue 51, 23 December 2011, Pages 9142-9148

【序号】：8
【作者】：Jamie M. Warren, Janusz Pawliszyn   
【题名】：Development and evaluation of needle trap device geometry and packing methods for automated and manual analysis
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】：Volume 1218, Issue 50, 16 December 2011, Pages 8982-8988

【序号】：9
【作者】：María Serrano, Manuel Silva, Mercedes Gallego   
【题名】：Micro liquid–liquid extraction combined with large-volume injection gas chromatography–mass spectrometry for the determination of haloacetaldehydes in treated water
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】：Volume 1218, Issue 46, 18 November 2011, Pages 8295-8302

【序号】：10
【作者】：Monica Alonso, Laura Cerdan, Anna Godayol, Enriqueta Anticó, Juan M. Sanchez 
【题名】：Headspace needle-trap analysis of priority volatile organic compounds from aqueous samples: Application to the analysis of natural and waste waters
【期刊】：Journal of Chromatography A
【年、卷、期、起止页码】：Volume 1218, Issue 45, 11 November 2011, Pages 8131-8139