Development of an electrochemical sensor for potassium ions based on KSr(2)Nb(5)O(15) modified electrode
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Data
2009-01-01
Autores
Teixeira, Marcos F. S. [UNESP]
Freitas, Bruno H. [UNESP]
Seraphim, Patricia M.
Salmazo, Leandra O. [UNESP]
Nobre, Marcos A. [UNESP]
Lanfredi, Silvania [UNESP]
Título da Revista
ISSN da Revista
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Editor
Elsevier B.V.
Resumo
In the work described by this paper, we studied the development of a selective potassium ion sensor constituted of a carbon paste electrode modified (CPEM) with a novel KSr(2)Nb(2)O(15). The material KSr(2)Nb(2)O(15) is an oxide with the tetragonal tungsten bronze structure (TTB) type are in forefront both in the area of research as well as in industrial applications. The sensor response to potassium ions was linear in the concentration range 1.26 x 10(-5) at 1.62 x 10(-3) mol L(-1) (E (mV) = 32.7 + 51.1 log [K(+)]). The sensor based KSr(2)Nb(2)O(15), of the TTB-type presented very good potentiometric response, with a slope of 51.1 mV/dec (at 25 degrees C) and detection limit for the potassium ions of 7.27 x 10(-5) mol.L(-1)
Descrição
Palavras-chave
Potassium ion sensor, Tetragonal tungsten bronze structure, Potentiometric detection
Como citar
Proceedings of The Eurosensors Xxiii Conference. Amsterdam: Elsevier B.V., v. 1, n. 1, p. 293-296, 2009.