FLOW-INJECTION DETERMINATION OF NITRATE IN VEGETABLES USING A TUBULAR POTENTIOMETRIC DETECTOR

• Type: Article in International Scientific Journal
• Date: 1995

Authors

Lima, JLFC (Author) FFUP; RANGEL, AOSS (Author) Other; SOUTO, MRS (Author) Other

Journal

Title: Journal of Agricultural and Food Chemistry

Vol. 43

Pages: 704-707

ISSN: 0021-8561

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 17 Citations

Other information

Authenticus ID: P-001-H7T

DOI: 10.1021/jf00051a027

Abstract (EN): A now injection system with potentiometric detection for the determination of nitrate in vegetables was developed. For this purpose a tubular nitrate ion-selective electrode with the ion-exchanger system [(4,7-diphenylphenanthroline)nickel(II) dissolved in o-nitrophenyl octyl ether] immobilized in a PVC membrane and without inner reference solution was prepared. The flow injection manifold incorporating the tubular electrode was used for the determination of nitrate in vegetables (lettuce, parsley, and spinach), using a mixture of lead acetate, lead oxide, and sodium acetate as nitrate extractant, ionic strength adjustor, and interference suppressor solution. The quality of the results obtained by the proposed methodology was assessed by comparing them with those provided by a conventional potentiometric methodology and also through recovery tests (recoveries from 94 to 104% were found). A sampling rate of 120 samples per hour was achieved with a relative standard deviation lower than 2%.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4