Planar solid-phase microextraction-ion mobility spectrometry for detection of explosives

What is it about?

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-trinitrotolu-ene, 2,4-dinitrotoluene, and of the explosive taggantethylene glycol dinitrate. The trap was characterized interms of coating thickness, morphology, inter-batch repeatability, and extraction efficiency. An average thickness of 143±13 μ m with a uniform distribution of the coating wasobtained. 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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