Study of a novel bisnaphthalimidopropyl polyamine as electroactive material for perchlorate-selective potentiometric sensors.
Amorim, Celia G.
Kong Thoo Lin, Paul
da Conceicao Montenegro, Maria
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GIL, R., AMORIM, C.G., CROMBIE, L., KONG THOO LIN, P., ARUJO, A. and da CONCEICAO MONTENEGRO, M. 2015. Study of a novel bisnaphthalimidopropyl polyamine as electroactive material for perchlorate-selective potentiometric sensors. Electroanalysis [online], 27(12), pages 2809-2819. Available from: http://dx.doi.org/10.1002/elan.201500275
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.