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

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Lapa, RAS (Author) FFUP; Lima, JLFC (Author) FFUP; Pinto, IVOS (Author) Other

Journal

Title: Analytical Sciences

Vol. 16

Pages: 1157-1160

ISSN: 0910-6340

Publisher: Japan Society for Analytical Chemistry

Indexing

ISI Web of Knowledge - 18 Citations

Scopus - 19 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4