ble in screening air cargo con- tainers .
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The technology is based on TeknoScan ' s Ion Mobility Spec- trometer with a fast-polarity switch for detecting positive and negative ions .
Teknoscan Systems Inc . ana- lyzed ten CWA simulants and studied the results of vapor sampling and the analysis of two examples , dipropylene glycol methyl ether ( DPGME ) and diethyl methyl phos- phate ( DEMP ).
Ion mobility spectrometer units perform fast analysis ( in 20 seconds ) and internal sec- ondary validation ( ISV ) GC analysis .
Gas chromatograph-dual polarity ion mobility spectrom- etry is widely used in the de- tection of explosive materials , illicit drugs , and human traf- ficking in maritime cargo con- tainers .
Detection System
To demonstrate the approach ,
Measurements were carried out at various soak times at tem- peratures varying from 10- 15oC inside the container .
The detector unit is based on a fast ion mobility spectrometer with an internal GC separator for dealing with complex sam- ples acquired when screening air cargo and marine contain- ers .
The analysis was executed using a chemically treated sample card to collect and concentrate both vapors and particulates of
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