Potentiometric Coated Wire Electrode for Salicylate based on Zinc(II) Acetylacetonate
نویسنده
چکیده
Um eletrodo na forma de fio modificado com acetilacetonato de zinco(II) como agente ionóforo, mostrou um comportamento de íon-seletivo exibindo uma resposta linear Nernstiana com uma inclinação igual a –59.6 ± 1.0 mV/década para uma ampla faixa de concentração (1.0 × 10-1.0 × 10 mol L). O eletrodo apresentou um limite de detecção igual a 5.0 × 10 mol L e tempo de resposta entre 5 a 10 s para atingir um potencial estável de 95% em diferentes concentrações de salicilato. O eletrodo funciona adequadamente em soluções aquosas em uma faixa de pH de 2,7 a 7,8. A vida útil foi testada por dois meses a fim de investigar sua estabilidade e, durante esse período, não se observou alteração significativa. Contudo, após dois meses, a curva apresentou uma queda gradual. O eletrodo proposto apresentou uma alta seletividade ao salicilato em relação a anions inorgânicos e orgânicos comuns e foi aplicado com sucesso na determinação de salicilato em amostras de fármacos.
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