A Novel Potentiometric Membrane Sensor for Determination of Glutamate Based on [4](1)(2,3-Diazabuta-1,3-diene) ferrocenophane

A novel potentiometric membrane sensor has been developed and optimized based on [4](1)(2,3-Diazabuta-1,3-diene)ferrocenophane as an ionophore in poly(vinyl chloride) matrix membrane (PVC) plasticized with tris(2-ethylhexyl) phosphate (TEHP) for high selective determination of glutamate. The sensor works well in a linear range of 1.0x10-5 to 1.0x10-1 M glutamate with a Nernstian slope of 57.6±1.0 mV/decade and its detection limit is 7.95x10-6 M. The sensor shows working range over the pH 6-10 at temperature 25±1 °C and stable for a period of 3 months without any divergence in potentials with response time ≤30s. The selectivity coefficient values as determined by mixed interference method indicate a good selectivity for ions over a wide variety of other tested anions.