title: A simple automated method for the determination of nitrate and nitrite in infant formula and milk powder using sequential injection analysis.
abstract: A fast and efficient automated method using a sequential injection analysis (SIA) system, based on the Griess, reaction was developed for the determination of nitrate and nitrite in infant formulas and milk powder. The system enables to mix a measured amount of sample (previously constituted in the liquid form and deproteinized) with the chromogenic reagent to produce a colored substance whose absorbance was recorded. For nitrate determination, an on-line prereduction step was added by passing the sample through a Cd minicolumn. The system was controlled from a PC by means of a user-friendly program. Figures of merit include linearity (r(2) > 0.999 for both analytes), limits of detection (0.32 mg kg(-1) NO(3)-N, and 0.05 mg kg(-1) NO(2)-N), and precision (s(r)%) 0.8-3.0. Results were statistically in good agreement with those obtained with the reference ISO-IDF method. The sampling frequency was 30 hour(-1) (nitrate) and 80 hour(-1) (nitrite) when performed separately.
authors.affiliation: Analytical Chemistry, DEC, School of Chemistry, University of the Republic (UdelaR), Avenida Flores 2124, 11800 Montevideo, Uruguay.
authors.forename: Mariela
authors.initials: M
authors.lastname: Pistón
authors.forename: Alicia
authors.initials: A
authors.lastname: Mollo
authors.forename: Moisés
authors.initials: M
authors.lastname: Knochen