Sequential injection analysis-based system for on-line monitoring of nitrite and nitrate in wastewaters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Lapa, RAS (Autor) FFUP; Lima, JLFC (Autor) FFUP; Pinto, IVOS (Autor) Outra

Revista

Título: Analytical Sciences

Vol. 16

Páginas: 1157-1160

ISSN: 0910-6340

Editora: Japan Society for Analytical Chemistry

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 19 Citações

Outras Informações

ID Authenticus: P-000-YH3

DOI: 10.2116/analsci.16.1157

Abstract (EN): A sequential injection analysis system has been developed for on-line monitoring of nitrite and nitrate in wastewaters, based on the Griess-Llosvay reaction and spectrophotometrical measuring of the absorbance at 543 nm. Nitrate is previously reduced to nitrite in a copperized cadmium column and analyzed as nitrite. The proposed system is fully automatized and is able to monitor nitrite and nitrate, simultaneously, in samples at a frequency of about 24 samples per hour with a relative standard deviation (RSD) better than 2.0% for nitrite and 1.3% for nitrate. The calibration graph was linear between 0.05 - 25 mg dm(-3) for nitrite and 0.05 - 15 mg dm(-3) for nitrate.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4