Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

• Main Authors: María S. Di Nezio, Miriam E. Palomeque, Beatriz S. Fernández Band
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2005-02-01
• Series: Química Nova
• Subjects: Cd (II); preconcentration; FIA
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000100025

The spectrophotometric determination of Cd(II) using a flow injection system provided with a solid-phase reactor for cadmium preconcentration and on-line reagent preparation, is described. It is based on the formation of a dithizone-Cd complex in basic medium. The calibration curve is linear between 6 and 300 µg L-1 Cd(II), with a detection limit of 5.4 µg L-1, an RSD of 3.7% (10 replicates in duplicate) and a sample frequency of 11.4 h-1. The proposed method was satisfactorily applied to the determination of Cd(II) in surface, well and drinking waters.