|Molina, Erick -|
|Yost, Richarad -|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: May 31, 2009
Publication Date: N/A
Technical Abstract: Differential mobility spectrometry (DMS), also referred to as high-field asymmetric waveform ion mobility spectromety (FAIMS), is a reapidly advancing technology for gas-phase separation. DMS has the potential to emerge as a major stand-alone separation technique such as LC or GC. To date, several applications of DMS have been made for a wide variety of matrices such as explosives, warfare agents and pesticides. Among its main advantages over traditional instrumentation techniques are that is singinifcantly faster, simple, and inexpensive. DMS is readily miniaturized, making it ideal as a rapid analytical screening technique for in teild detection of insecticides. A novel method based on DMS technology has been developed and evaluated for the detection of insecticides. Evaluation of DMS parameters such as carrier gas flow rate and composition, dispersion voltage and sensor temperature will be discussed in this presentation. Sample working solutions were prepared in either pure acetone, acetonitrite or methanol at concentrations ranging from 1 to 10 ng/ul. Experiments were completed using two Sionex MicroDMx analyzers. One that was attached as a detector to a Finnigan GC and used for measurements of field dependence of mobility, for quantitative characterization of response, and for studies with modifications of the drift gas. The second analyzer was coupled in front of a mass spectrometer, so the core ions in DMS spectra could be mass identified in both instruments, the analytical parameters and components were identical and included a wide of 0.5 mm between the electrodes (4 x 15 mm) and 3 mCi63Ni ion source.