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Study of a Novel Bisnaphthalimidopropyl Polyamine as Electroactive Material for Perchlorate‐selective Potentiometric Sensors
Authors:Renato Gil  Célia G Amorim  Laura Crombie  Paul Kong?Thoo?Lin  Alberto Araújo  Maria da?Conceição?Montenegro
Institution:1. REQUIMTE/Departamento de Ciências Químicas;2. Faculdade de Farmácia. Universidade do Porto. R. Jorge Viterbo Ferreira, 228. 4050‐313 Porto. Portugal.;3. School of Pharmacy & Life Sciences;4. Faculty of Health & Social Care. Robert Gordon University. Garthdee Road, Aberdeen. Scotland United Kingdom
Abstract:In this work, the new polyamine bisnaphthalimidopropyl‐4,4’‐diaminodiphenylmethane is proposed as a new ionophore for perchlorate potentiometric sensors. The optimal formulation for the membrane comprised of 12 mmol kg?1 of the ionophore, and 68 % (w/w) of 2‐nitrophenyl phenyl ether as plasticizer and 31 % (w/w) of high molecular weight PVC. The sensors were soaked in water for a week to allow leakage of anionic impurities and for one day in a perchlorate solution (10?4 mol L?1) to improve reproducibility due to its first usage. The stability constant for the ionophore‐perchlorate association in the membrane, log βIL1=3.18±0.04, ensured a performance characterized by the slope of 54.1 (±0.7) mV dec?1 to perchlorate solutions with concentrations between 1.24×10?7 and 1.00×10?3 mol L?1. The sensors are insensitive to pH between 3.5 to 11.0, they have a practical detection limit of 7.66 (±0.42) ×10?8 mol L?1 and a response time below 60 s for solutions with perchlorate concentrations above 5×10?6 mol L?1. The accuracy of the results was confirmed by the analysis of the contaminant in a certified reference water sample.
Keywords:Bisnaphthalimidopropyl polyamine  potentiometry  sensors  perchlorate  waters
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