主题：【已应助】请帮忙查几篇英文文献，谢谢

【序号】：1
【作者】：Mahdi Hashemi, Seyed Mosayeb Daryanavard
【题名】：Ultrasound-assisted cloud point extraction for speciation and indirect spectrophotometric determination of chromium(III) and (VI) in water samples
【期刊】：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
【年、卷、期、起止页码】：Volume 92, 15 June 2012, Pages 189-193

【序号】：2
【作者】：Nahid Pourreza, Mohammad Reza Fat'hi, Ali Hatami
【题名】：Indirect cloud point extraction and spectrophotometric determination of nitrite in water and meat products
【期刊】：Microchemical Journal
【年、卷、期、起止页码】：,Volume 104, September 2012, Pages 22-25

【序号】：3
【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】：Volume 742, 12 September 2012, Pages 17-21