Planar solid-phase microextraction-ion mobility spectrometry: a diethoxydiphenylsilane-based coating for the detection of explosives and explosive taggants |
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Authors: | M Mattarozzi F Bianchi F Bisceglie M Careri A Mangia G Mori A Gregori |
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Institution: | 1.Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica,Università degli Studi di Parma,Parma,Italy;2.EUROFOS-European Master Course in Forensic Sciences,Università degli Studi di Parma,Parma,Italy;3.Reparto Carabinieri Investigazioni Scientifiche di Parma,Parma,Italy |
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Abstract: | A novel diethoxydiphenylsilane-based coating for planar solid-phase microextraction was developed using sol–gel technology
and used for ion mobility spectrometric detection of the explosives 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, and of the
explosive taggant ethylene glycol dinitrate. The trap was characterized in terms of coating thickness, morphology, inter-batch
repeatability, and extraction efficiency. An average thickness of 143 ± 13 μm with a uniform distribution of the coating was
obtained. Good performances of the developed procedure in terms of both intra-batch and inter-batch repeatability with relative
standard deviations <7% were obtained. Experimental design and desirability function were used to find the optimal conditions
for simultaneous headspace extraction of the investigated compounds: the optimal values were found in correspondence of a
time and a temperature of extraction of 45 min and 40 °C, respectively. Detection and quantitation limits in low nanogram
levels were achieved proving the superior extraction capability of the developed coating, obtaining ion mobility spectrometric
responses at least two times higher than those achieved using commercial teflon and paper traps. |
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