Effect of dopants on the analysis of pesticides by means of differential mobility spectrometry with atmospheric pressure photoionization |
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| Authors: | Sven Roetering Erkinjon G Nazarov Helko Borsdorf Christian Weickhardt |
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| Institution: | (1) Leipzig University of Applied Sciences, Faculty of Computer Science, Mathematics and Natural Sciences, Karl-Liebknecht-Str. 145, 04277 Leipzig, Germany;(2) Sionex Corporation, 8-A Preston Court, Bedford, MA 01730, USA;(3) UFZ-Helmholtz Centre for Environmental Research, Department Monitoring and Exploration Technologies, Permoserstr. 15, 04318 Leipzig, Germany |
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| Abstract: | The chances to improve the detection of pesticides using differential mobility spectrometry (DMS) with an atmospheric pressure
photoionization (APPI) ion source by means of dopants was investigated. The effect of employing benzene, anisole and chlorobenzene
as dopants is described regarding sensitivity, limits of detection and peak displacements in the spectra. For typical pesticides
an improvement of detection limits up to two orders of magnitude could be determined, while for the peak shift of individual
substances no uniform behaviour was observed. Possible mechanisms of action in respect to atmospheric pressure photoionization
(APPI) processes are discussed. |
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