Article ID Journal Published Year Pages File Type
1244699 Talanta 2010 7 Pages PDF
Abstract

A simple and precise square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV) method has been described for simultaneous determination of Mn(II), Cu(II) and Fe(III) in water samples using a carbon paste electrode. In 0.1 mol L−1 acetate buffer (pH 5) containing 50 μmol L−1 of 2-(5′-bromo-2′-pyridylazo)-5-diethylaminophenol (5-Br-PADAP), Mn(II), Cu(II) and Fe(III) were simultaneously determined as metal-complexes with 5-Br-PADAP following preconcentration onto the carbon paste electrode by adsorptive accumulation at +1.0 V (vs. Ag/AgCl/3 M KCl). Insignificant interference from various cations (K+, Na+, Mg2+, Ca2+, Al3+, Bi3+, Sb3+, Se4+, Zn2+, Ni2+, Co2+, Cd2+, Pb2+, V5+, Ti4+ and NH4+), anions (HCO3−, Cl−, NO3−, SO42− and PO43−) and ascorbic acid was noticed. Limits of detection of 0.066, 0.108 and 0.093 μg L−1 and limits of quantitation of 0.22, 0.36 and 0.31 μg L−1 Mn(II), Cu(II) and Fe(III), respectively, were achieved by the described method. The described stripping voltammetry method was successfully applied for simultaneous determination of Mn(II), Cu(II) and Fe(III) in ground, tap and bottled natural water samples.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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