Determination of Trace PCB in Water by GC-MS with Ionic Liquid Based Headspace Single-Drop Microextraction under Ultrasound

Shi Wei He; Chen Yi Shen; Xiao Qin Wei; Mi Cong Jin; Mei Qiang Cai

doi:10.4028/www.scientific.net/AMR.726-731.74

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 726-731Determination of Trace PCB in Water by GC-MS with...

Determination of Trace PCB in Water by GC-MS with Ionic Liquid Based Headspace Single-Drop Microextraction under Ultrasound

Abstract:

An accurate and sensitive method has been developed for the determination of PCBs in water by gas chromatography coupled with mass spectrometry (GC/MS) with ionic liquid based headspace single-drop microextraction under ultrasound. The sample injection part of gas chromatographic instrument was modifed to avoid the ionic liquid leaking, selected 1-butyl-3-methylimidazolium hexafluorophosphate ([C₄MI[PF₆]) as extracting agents. Experimental parameters influencing the extraction performance, such as desorption temperature, ultrasound extraction time, extraction temperature, ionic liquid headspace volume and salt effect, were optimized. Calibration curve was linear within the range of 10~300.0 μg/L, and the extraction recoveries with RSD values lower than 9.1% were from 77.6% to 103.3%. The limits of detections (LOD), calculated on the basis of signal-to-noise ratio of 3 (S/N=3), was in the range of 0.005~0.007 μg/L. This method is found to be simple, sensitive, little interferential and good specificity for the determination of trace PCBs in water. Real sea sample was successfully analyzed using this method.