Flow injection system with gas diffusion for the sequential determination of total nitrogen and phosphorus in vegetables

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

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

Revista

Título: Fresenius' Journal of Analytical Chemistry

Vol. 358

Páginas: 657-662

ISSN: 0937-0633

Editora: Springer

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 8 Citações

Outras Informações

ID Authenticus: P-001-B4D

DOI: 10.1007/s002160050486

Abstract (EN): A flow injection system was developed for the sequential determination of total nitrogen and phosphorus in digests of vegetables using potentiometric and spectrophotometric detection systems, respectively. A tubular ammonium selective electrode with a sensor system composed of nonactin/monactin in tris(2-ethylhexyl) phosphate was used. The selectivity limitations of this electrode were overcome by the inclusion of a gas-diffusion unit in the system that separated ammonium from the rest of the sample matrix and allowed the determination of total nitrogen and phosphorus by the partition of the sample plug between two streams. The results obtained with the developed FIA system were in good agreement with those of the reference methods. Sampling rates from 40 to 60 samples per hour and relative standard deviations below 3.5% were achieved.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6