Construction of a novel potentiometric terbium(III) membrane sensor and its application for the determination of terbium ion in binary mixture and fluoride ion in a mouth wash preparation

Abstract

Um novo sensor potenciométrico constituído por uma membrana de PVC, altamente seletivo a íons Tb(III) foi preparado usando-se 4-amino-3-{2-[4-amino-6-metil-5-oxo-4,5-diidro-1,2,4triazina-3(2H)-ilidina] hidrazono}-6-metil-3,4-diidro-1,2,4-triazina-5(2H)-ona (ATO) como um carregador adequado. O sensor trabalha satisfatoriamente no intervalo de concentração de 1,0 × 10 -6 a 1,0 × 10 -1 mol L -1 (limite de detecção 8,6 × 10 -7 mol L -1 ) com uma inclinação Nernstiniana de 19,4 ± 0.5 mV per década de atividade. O eletrodo mostrou rápido tempo de resposta (~15 s) e foi usado por um período superior a 2 meses. Os valores do coeficiente de seletividade potenciométrica (para cátions mono-, di-, e trivalentes) como determinado pelo método match potential (MPM) indicou boa resposta para Tb 3+ na preseça de íons interferentes. A membrana sensora foi usada como um eletrodo indicador na titulação potenciométrica de íons Tb(III) com EDTA. Foi também aplicado na determinação de íons fluoreto em amostras de preparados para enxágue bucal e na recuperação de Tb 3+ de várias misturas binárias.A new PVC membrane potentiometric sensor that is highly selective to Tb(III) ions was prepared by using 4-amino-3-{2-[4-amino-6-methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3(2H)-yliden] hydrazono}-6-methyl-3,4-dihydro-1,2,4-triazin-5(2H)-one (ATO) as a suitable carrier. The sensor works satisfactorily in the concentration range of 1.0 × 10 -6 to 1.0 × 10 -1 mol L -1 (detection limit 8.6 × 10 -7 mol L -1 ) with a Nernstian slope of 19.4 ± 0.5 mV per decade of activity. This electrode showed a fast response time (~15 s) and was used for a period of more than 2 months. The potentiometric selectivity coefficient values (for mono-, di-, and trivalent cations) as determined by the match potential method (MPM) indicate good response for Tb 3+ in the presence of interfering ions. The membrane sensor was used as an indicator electrode in the potentiometric titration of Tb(III) ions with EDTA. It was also applied to the determination of fluoride ions in mouth wash preparation sample and the Tb 3+ recovery from various binary mixtures.Keywords: 4-amino-3-{2-[4-amino-6-methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3(2H)-yliden] hydrazono}-6-methyl-3,4-dihydro-1,2,4-triazin-5(2H)-one, terbium, potentiometry, ion-selective electrode

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

“…Other sensors include Eu 3+ [171,172], Gd 3+ [173][174][175][176], Tb 3+ [177,178], Dy 3+ [179,180], Ho 3+ [181,182], Er 3+ [183], Tm 3+ [184,185], Yb 3+ [186][187][188] PMEs, in addition to one Lu 3+ PME [189] and two uranyl PMEs and GCE [190,191]. The minimum detection limit among all of these sensors is reported to be 7.0 × 10 -8 for uranyl ion [191], which is a 2,2'- …”

Development of electrochemical sensors for nano scale Tb(III) ion determination based on pendant macrocyclic ligands

“…Thus, the development of new ion-selective electrodes for lanthanides is still a challenging task. A number of investigations into the development of terbiumselective electrodes using bispyrr olidene schiff's base [26], 4-amino-3-{2-[4-amino-6methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3-(2H)-yliden]hydrazono}-6-methyl-3,4-dihydro-1,2,4-triazin-5(2H)-one [27] and S-2-benzothiazo lyl-2-amino-␣-(methoxyimino)-4-thiazolethiol acetate [28] have been reported in the literature but they have a narrow dynamic range and high detection limit.…”

A Silver(i) PVC-Membrane Sensor Based on Synthesized Dilaktam Crown Ether

“…[12][13][14][15][16][17][18] Recently, several greatly selective and sensitive PVC-membrane ionselective electrodes for various metal ions have been reported. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Nevertheless, this paper focuses on the introduction of a highly siver(I)-selective sensor based on Dilaktam Crown ether (DLCE) (Fig. 1), as a novel neutral ionophore for monitoring silver concentration.…”