Determination of fe (III) in sea water samples by adsorptive stripping voltammetry with 1-(2-pyridylazo)-2- naphthol using a bismuth film electrode

ANYL 99

Rodrigo Segura, rasegura@uc.cl1, M. Toral1, and Veronica Arancibia, darancim@puc.cl2. (1) Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile, (2) Chemistry Faculty. Inorganic Department, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860. Macul. Santiago, Santiago of Chile, Chile
The bismuth film electrode (BiFE) prepared by plating a glassy carbon support “ex situ “was evaluated for iron determination by square wave adsorptive stripping voltammetry (SWAdSV). The Fe(III) was complexed with 1-(2-piridylazo)-2-naphthol (PAN) and the complex was accumulated by adsorption on the surface of preplated BIFE. Factors that influence the stripping performance, such as the film preparation, pH, PAN and ethanol concentration, potential and time accumulation were optimized. The best conditions were obtained at pH 4.0 (buffer acetate 0.1 M in 20% ethanol), 5 mM PAN, 60 s accumulation time and -400 mV accumulation potential, pulse height of 4 mV, pulse amplitude 25 mV and frequency 15 Hz. The relationship between the peak current and concentration was linear over the range of 0.4 to 60.0 µg L-1. The limits of detection were 0.04 µg L-1. The method was validated with reference material.

 

General Posters
7:00 PM-9:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Analytical Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007