Wang Y, Kwok Y C, He Y, Lee H K
Department of Chemistry, National University of Singapore, Kent Ridge, Republic of Singapore.
Anal Chem. 1998 Nov 1;70(21):4610-4. doi: 10.1021/ac9804339.
A dynamic liquid-phase microextraction technique combined with gas chromatography/mass spectrometry (GC/MS) is described for the extraction of 10 chlorobenzenes from water samples into 1 microL of organic solvent by using a conventional microsyringe. The effects of extraction solvent, plunger movement pattern, sampling volume, number of samplings, and salt concentration on the extraction performance were investigated. Good repeatabilities of extraction were obtained, with the RSD values below 5.3% except for hexachlorobenzene (9.3%). By using a sampling volume of 6 microL and 15 samplings, detection limits were found to be between 0.02 and 0.05 microgram/L under GC/MS-selective ion monitoring mode.
本文描述了一种动态液相微萃取技术，该技术与气相色谱/质谱联用（GC/MS），可通过常规微量注射器将水样中的10种氯苯萃取到1微升有机溶剂中。研究了萃取溶剂、柱塞移动模式、进样体积、进样次数和盐浓度对萃取性能的影响。获得了良好的萃取重复性，除六氯苯（9.3%）外，相对标准偏差（RSD）值均低于5.3%。在GC/MS选择性离子监测模式下，采用6微升进样体积和15次进样，检测限在0.02至0.05微克/升之间。
