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



Document title: 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
Journal: Journal of the Brazilian Chemical Society
Database: PERIÓDICA
System number: 000311866
ISSN: 0103-5053
Authors: 1
1
2
Institutions: 1Islamic Azad University, Department of Chemistry, Teherán. Irán
2Tehran University, Teherán. Irán
Year:
Season: Dic
Volumen: 17
Number: 7
Pages: 1297-1303
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental
English abstract 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 Tb3+ 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 Tb3+ recovery from various binary mixtures
Portuguese 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-1,2,4 -triazina-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 Tb3+ 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 Tb3+ de várias misturas binárias
Disciplines: Química
Keyword: Química analítica,
Sensores de membrana,
Terbio,
Potenciometría,
Electrodos selectivos de iones
Keyword: Chemistry,
Analytical chemistry,
Membrane sensors,
Terbium,
Potentiometry,
Ion-selective electrodes
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