Vanadium(IV) and vanadium(V) complexation by succinic acid studied by affinity capillary electrophoresis. Simultaneous injection of two analytes in equilibrium studies

Knežević, Lucija; Zanda, Emanuele; Bura-Nakić, Elvira; Filella, Montserrat; Sladkov, Vladimir (2023) Vanadium(IV) and vanadium(V) complexation by succinic acid studied by affinity capillary electrophoresis. Simultaneous injection of two analytes in equilibrium studies. Journal of Chromatography A, 1695 . ISSN 0021-9673

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Abstract

The interaction of V(IV) and V(V) with succinic acid was investigated by affinity capillary electrophore- sis (ACE) in aqueous acid solutions at pH values 1.5, 2.0 and 2.4, and different ligand concentra- tions. V(IV) and V(V) form protonated complexes with succinic acid ligand at this pH range. The loga- rithms of the stability constants, measured at 0.1 mol L-1 (NaClO4 /HClO4) ionic strength and 25 °C, are logβ111 =7.4 ± 0.2 and logβ122 =14.1 ± 0.5 for V(IV), and logβ111=7.3 ± 0.1 for V(V), respectively. The stability constant values, extrapolated to zero ionic strength with the Davies equation, are logβ°111=8.3 ± 0.2 and logβ°122 =15.6 ± 0.5 for V(IV) and logβ°111 =7.9 ± 0.1 for V(V). The application of ACE to the simultaneous equilibria of V(IV) and V(V) (injection of two analytes) was also attempted. When the results were compared with those obtained when introducing only one analyte in the capillary, using the traditional version of the method, similar stability constants and precision are obtained. The possibility of studying two analytes simultaneously decreases the time needed for the determination of the constants ; this feature is especially valuable when working with hazardous materials or when only small quantities of ligand are available.

Item Type:	Article
Uncontrolled Keywords:	Affinity capillary electrophoresis; Complexation; Stability constants ; Vanadium ; Succinic acid
Subjects:	NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Geokemija i zapis redoks indikatora u različitim uvjetima okoliša: prema boljem razumijevanju redoks uvjeta u prošlosti Bura-Nakić, Elvira IP-2018-01-7813 HRZZ
Depositing User:	Lucija Knežević
Date Deposited:	19 Apr 2023 10:52
URI:	http://fulir.irb.hr/id/eprint/7938
DOI:	10.1016/j.chroma.2023.463941

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