Catalytic Adsorptive Stripping Voltammetric Determination of Cobalt and Nickel as Their α‐Furil Dioxime Complexes
2004; Wiley; Volume: 16; Issue: 18 Linguagem: Inglês
10.1002/elan.200302984
ISSN1521-4109
Autores Tópico(s)Analytical Chemistry and Sensors
ResumoAbstract The exploitation of the catalytic‐adsorptive effect in the Co(II)‐dioxime‐nitrite systems provides a significant increase of the Co adsorptive stripping voltammetric response and subsequently the influence of the interfering elements such as Ni and Zn is strongly diminished. The purpose of the present paper was to study voltammetric properties of Co and Ni in a supporting electrolyte containing ammonia buffer, α‐furil dioxime in the absence and in the presence of nitrite, by differential pulse polarography and adsorptive stripping voltammetry. Results of detailed studies aimed at optimizing the analytical parameters for simultaneous catalytic adsorptive stripping voltammetric determination of Co and Ni in the form of complexes with α‐furil dioxime in the presence of Zn matrix are presented. In the supporting electrolyte of composition 0.1 M NH 4 Cl, 0.5 M NH 3 , 4×10 −5 M αFD, 0.5 M NaNO 2 the linearity range amounts from 0.03 to 2.4 μg/L for Co and from 0.3 to 9 μg/L for Ni for 20 s of accumulation. The method enables the determination of Co and Ni in the presence of a great excess of Zn with the detection limit equal to 0.02 μg/L Co and 0.2 μg/L Ni obtained for a 20 s accumulation time.
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