Al3+-Selective PVC Membrane Sensor Based on Newly Synthesized 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,4-dithiobutane as Neutral Carrier

摘要

A new sensitive and selective poly(vinyl chloride)-based membrane sensor for aluminum ions wasprepared by employing on 1,4-bis[o-(pyridine-2-carboxamidophenyl)]-1,4-dithiobutane (PCD) as anneutral ion carrier and investigated as a selective membrane sensor. The electrode exhibits a near-1 3+ Nernstian response (19.40.3 mVdecade ) for Al ions over a wide concentration range from -1 -1 1.010 to 1.010 mol L with a limit of detection of 6.310 mol L in a pH range of 2.0.2.The best performance was obtained with membrane composition 30% poly(vinyl chloride), 66%nitrobenzene, 2% sodium tetraphenylborate and 2% ionophore PCD. It has relatively fast responsetime (~5 s) and can be used at least for 2 months without any considerable divergence in potentials.This sensor revealed a great enhancement in selectivity coefficients for aluminum(III) ions incomparison with the previously reported aluminum(III) sensors. It was used as an indicator electrode3+ in potentiometric titration of Al with EDTA.