Study of a Novel Bisnaphthalimidopropyl Polyamine as Electroactive Material for Perchlorate-selective Potentiometric Sensors

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Gil, R (Autor) Outra; Amorim, CG (Autor) FFUP; Crombie, L (Autor) Outra; Lin, PKT (Autor) Outra; Araujo, AN (Autor) FFUP; Montenegro, MCBSM (Autor) FFUP

Revista

Título: Electroanalysis

Vol. 27

Páginas: 2809-2819

ISSN: 1040-0397

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: P-00K-0NQ

DOI: 10.1002/elan.201500275

Abstract (EN): In this work, the new polyamine bisnaphthalimidopropyl-4,4'-diaminodiphenylmethane is proposed as a new ionophore for perchlorate potentiometric sensors. The optimal formulation for the membrane comprised of 12 mmol kg(-1) of the ionophore, and 68% (w/w) of 2-nitrophenyl phenyl ether as plasticizer and 31% (w/w) of high molecular weight PVC. The sensors were soaked in water for a week to allow leakage of anionic impurities and for one day in a perchlorate solution (10(-4) mol L-1) to improve reproducibility due to its first usage. The stability constant for the ionophore-perchlorate association in the membrane, log beta(IL1)=3.18 +/- 0.04, ensured a performance characterized by the slope of 54.1 (+/- 0.7) mV dec(-1) to perchlorate solutions with concentrations between 1.24 x 10(-7) and 1.00 x 10(-3) mol L-1. The sensors are insensitive to pH between 3.5 to 11.0, they have a practical detection limit of 7.66 (+/- 0.42) x 10(-8) mol L-1 and a response time below 60 s for solutions with perchlorate concentrations above 5 x 10(-6) mol L-1. The accuracy of the results was confirmed by the analysis of the contaminant in a certified reference water sample.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11