Abstract
A sensitive, selective and high throughput gas chromatography–tandem mass spectrometry method using programmable temperature vaporization–large volume injection mode (PTV-LVI-GC-MS/MS) for the analysis of 30 organochlorine pesticides (OCPs) including toxaphenes in sediments was developed. The PTV-LV injection settings, viz. inlet temperature, split flow, injection phase time, and injection speed were optimized for 50 µL injection. A significant increase in sensitivity was accomplished as compared with that obtained by the conventional 1 µL cold splitless injection. Average LVI recoveries for OCPs were in the range 58–133 % with low % RSD in instrument precision (<12 %). The method detection limits achieved were 0.04–0.92 µg kg−1. The method recovery ranged from 80 to 120 % with <10 % RSD for more than 83 % of targeted analytes fortified at 10 µg kg−1 in sediments. The PTV-LVI-GC-MS/MS allows simultaneous determination and unambiguous confirmation of trace OCPs and toxaphene congeners, which significantly streamlines and improves the trace organic analysis in the environmental surveillance and monitoring.
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Acknowledgments
The authors express sincere thanks to Dr. C. M. Lau, Government Chemist and Dr. Della W. M. Sin, Assistant Government Chemist of the Government Laboratory of HKSAR, for their supports and encouragement during the course of study. The contents of this paper do not necessarily reflect the views of the Government of the HKSAR, nor does mention of trade name or commercial products constitute endorsement or recommendations of use.
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Lee, P.Hm., Tang, H.Po. Multi-Pesticide Analysis in Sediment by GC-EI-MS/MS Using Programmed Temperature Vaporization–Large Volume Injection Technique. Chromatographia 78, 695–705 (2015). https://doi.org/10.1007/s10337-015-2876-0
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DOI: https://doi.org/10.1007/s10337-015-2876-0