Abstract
In the review, voltammetric analytical procedures that employ vanadium(IV) and aminopolycarboxylic complexes of V(IV) are presented and discussed. The focus of the paper is on the mechanism of vanadium-catalyzed reactions responsible for the amplification of the analytical signal of Ge(IV). The analytical efficacy of different catalytic systems is compared, and the optimal parameters of the respective procedures are reported.
Highlights
In the review, voltammetric analytical procedures that employ vanadium(IV) and aminopolycarboxylic complexes of V(IV) are presented and discussed
Oxovanadium(IV) ions form numerous complexes with many ligands, resulting in fiveor six-membered chelate rings with N or O being the points of attachment (Figure 2, chelate rings marked by the blue ellipse in the image)
0.31 V and the amplification factor is only 1.5 (Figure 12c). These results indicate that a simple cyclic voltammetric test can be used to select the most promising candidates for V(IV) chelating agents in catalytic adsorptive stripping voltammetry
Summary
There are not many reviews devoted to the electrochemical properties of vanadium [4,5,6] These properties are unique, since in aqueous solutions vanadium can have up to four oxidation states, i.e., +2, +3, +4, and +5 (Figure 1) [7]. Oxovanadium(IV) ions form numerous complexes with many ligands, resulting in fiveor six-membered chelate rings with N or O being the points of attachment (Figure 2, chelate rings marked by the blue ellipse in the image). Detailed descriptions of these chelates, numerous images demonstrating their structure, and an overview of their applications are presented in some recent reviews [10,11].
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