Determinação de anião nitrato em águas por FIA usando um detector potenciométrico tubular

• Tipo: Artigo em Revista Científica Internacional
• Data: 1996

Autores

Lima, JLFC (Autor) FFUP; Rangel, AOSS (Autor) Outra; Souto, MRS (Autor) Outra

Revista

Título: Revista Portuguesa de Farmacia

Vol. 46

Páginas: 82-88

ISSN: 0484-811X

Editora: Ordem dos Farmaceuticos

Indexação

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-007-B7F

Abstract (EN): In this work, a flow injection system for the potentiometric determination of nitrate content in waters, is described. A tubular nitrate ion-selective electrode without inner reference solution and an ion-exchanger system composed of (4,7-diphenylphenanthroline)nickel (II) nitrate in o-nitrophenyl octyl ether was used as indicator electrode. These units were evaluated In two ionic strength adjustor solutions and their operational characteristics compared with those of conventionally shaped electrodes with the same sensor system. The developped methodology allows the determination of nitrate anion in waters without sample pre-treatment and with a high sampling rate (ranging from 60 to 120 determinations per hour) and precision (relative standard deviations inferior to 2%). Results are in good agreement with the reference procedure and the lower limit of linear response is 14.9 mg L-1.

Idioma: Português

Tipo (Avaliação Docente): Científica