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This study demonstrates the first time use of electrospun nanofibrous hydrophobic membranes as gas diffusion (GD) membranes in flow injection analysis (FIA) for the determination of carbon dioxide. Different electrospun membranes are prepared from polyvinylidene fluoride (PVDF) and polystyrene (PS) polymers. To impart structural integrity for PVDF membrane, the addition of 1,4‐butanediol dimethacrylate (BDDMA) is used to form an interpenetrating network, while for PS membranes are spot welded with heat‐pressing at 80 °C. Heat pressed PS membranes are shown to have the best analytical sensitivity among other electrospun membranes and performed as well as the commercial PP membrane. A correlation is observed between the thickness of heat pressed PS membranes and analytical sensitivity.

Abstract:A new extracting polymer wool was prepared from polystyrene (PS) and the commercial extractant Aliquat 336 by electrospinning and its potential as a packing material for an online preconcentration column in an automated flow injection system was investigated for the determination of thiocyanate (SCN − ). The formation of the wool fibres was confirmed by scanning electron microscopy (SEM). The polymer wool was inserted into a glass tube to prepare a column. a sampling rate of 9 h −1 . To the authors' best knowledge this is the first time electrospun fibres containing a liquid extractant have been used for preconcentration in a flow analysis system.