A simple Methods for the Determination of Nitrate in Acidic Solutions with high Iron Content Based on the Traditional Cadmium Reduction Technique

NICHELA, DANIELA; TEMPORETTI, PEDRO; ESCALANTE, RUBÉN; PEDROZO, FERNANDO

LATIN AMERICAN APPLIED RESEARCH

PLAPIQUI(UNS-CONICET)

Lugar: Bahia Blanca; Año: 2014 vol. 14 p. 283 - 288

0327-0793

A simple and unexpensive method based on traditional cadmium column technique is proposedfor determination of nitrate in acidic aqueous mixtures with high iron load. Solutions arealkalinized and centrifuged, subsequently the supernatant is withdrawn for nitrate analysis. Bythis procedure two effects are accomplished, on the one hand, pH is adjusted to a suitable value and, on the other hand, iron interference is removed by precipitation. The obtained mixture is passed through a copperized cadmium column to reduce nitrate to nitrite which is quantifiedspectrophometrically. This method is suitable to measure nitrate concentrations even lower than themaximum accepted limit, in artificial solution.