Potentiometric coated wire electrode for salicylate based on zinc(II) acetylacetonate

Abstract

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 -5 -1.0 × 10 -1 mol L -1 ). O eletrodo apresentou um limite de detecção igual a 5.0 × 10 -6 mol L -1 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.A coated-wire ion selective electrode based on zinc(II) acetylacetonate as ionophore exhibited linear response with Nernstian slope of -59.6 ± 1.0 mV/decade over a wide concentration range (1.0×10 -5 -1.0×10 -1 mol L -1 ). This electrode has 5.0×10 -6 mol L -1 detection limit. The proposed electrodes has a response time between 5-10 s to achieve a 95% steady potential for salicylate concentrations. The electrode was suitable for use in aqueous solutions in a wide pH range of 2.7 to 7.8. The electrode life time was tested over a period of two months to investigate its stability. No significant change in the performance of the electrode was observed during this period, but after two months, a gradual decrease ocurred in the slope. The proposed electrode showed high selectivity for salicylate over a number of common inorganic and organic anions. The electrode was successfully applied to the determination of salicylate in pharmaceutical samples.

One decade of research on ion-selective electrodes in Iran (1996–2006)

“…Numerous Cu 2+ sensors have been constructed by Iranian scientists including CGEs [94,98], CWEs [99,104,111], solgel electrode [105] and mostly PMEs . Almost all of these sensors have Nernstian behaviors and the minimum detection limit is reported in the case of a 2-{1-(E)-2-((Z)-2-{(E)-2-[(Z)-1-(2-hydroxyphenyl) ethylidene] hydrazono}-1-methylpropylidene) hydrazono]ethyl}phenol based PME [110].…”

Salicylate Ion‐Selective Electrode Based on a Calix[4]arene as Ionophore

“…Recently, various ionophores for PVC membrane salicylate‐selective electrodes have been reported in the literature. Among these, metal complexes of Schiff bases 3, 20, 22–30, vanadyl, molybdenyl and copper(II) phthalocyanines 2, 31, chromium(III) porphyrin 1, copper(II) complex of hydrazone derivative 19, zinc(II) acetylacetanote 32, tripodal tris‐thiourea derivatives 33, copper(II) complex of tetraazacyclohexadecane derivative 34, nanocomposites 5 appear to be promising. Most of these ionophores utilized in the development of above mentioned salicylate‐selective electrodes are metal complexes which provided a response mechanism based on specific metal‐ligand interactions.…”

Three‐Electrode‐Integrated Sensor into a Micropipette Tip

“…Different materials have been applied to produce miniaturized electrodes which can be used in small volume samples such as gold [11][12][13], silver [13], platinum [14] and copper wires (i.d. up to 200 mm) [15], thin gold films obtained from CD-Rs [16][17][18], carbon paste electrodes [19], graphite composite [17,20], silver composite [17,18], and stainless steel needles [21,22].…”