Chemistry Journal of Moldova

ADSORPTION WAVE OF VANADIUM COMPLEX WITH 2,3–DIHYDROXYBENZALDEHYDE

Author(s):

Ludmila Kiriyak, Natalia Cecoi, Tatiana Cazac, Mihail Revenco


Field: Analytical chemistry
Type: Research paper
Issue: 2009 Volume 4, no.2
Pages: 24-27
Keywords:

Voltammetry, 2,3–dihydroxybenzaldehyde, vanadium.


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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2009.04(2).16

Graphical Abstract:
 The polarographic behavior of the complex formed by V(V) and 2,3–dihydroxybenzaldehyde (2,3–DHBA) in the solution containing acetate buffer (pH 5,2) has been investigated. By means of a.c. polarography, chronovoltammetry and other techniques, it has been shown that the electrode process is complicated by the adsorption of 2,3-DHBA and its vanadium complex. The kinetic and adsorption parameters of the electrode process have been determined: adsorption equilibrium constant B= 1,32⋅105 mol-1⋅dm3, the attraction constant γ = 1,2, the maximum surface concentration Гmax = 9,10⋅10-11 mol⋅ cm-2; the share of the electrode surface occupied by one particle of the adsorbed complex S = 1,81 nm2 and the free adsorption energy ΔG = - 39,1 kJ· mol-1.

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