Abstract

In this work, we present an Atmospheric Pressure Chemical Ionisation (APCI) study of several organic solvents relevant to Thin Layer Chromatography (TLC) (methanol, ethanol, propan-2-ol, acetone, ethyl acetate, diethylamine). The solvents were investigated using an Ion Mobility Spectrometry (IMS) combined with orthogonal acceleration Time Of Flight Mass Spectrometry (IMS-oaTOF MS). The solvents were iononised by Reactant Ions (RI – H+.(H2O)3,4 m/z 55 and 73). The ions were analysed using IMS and IMS-oaTOF technique was used to assign the ion mobility peaks to ions according to their m/z. IMS spectra of methanol, ethanol, propan-2-ol and diethylamine exhibited only one peak (reduced ion mobilities of 2.19, 2.07, 1.98, 2.06 cm2s−1V−1 respectively) whereas acetone and ethyl acetate were characterised by two peaks (2.15, 1.85 and 1.94, 1.53 cm2s−1V−1 respectively). The IMS-oaTOF spectrometry assigned IMS peaks of VOCs to M⋅H+(H2O)n. n = 0,1,2 or M2⋅H+ ions, where M represents the solvent molecule.

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