Volume: 3, 2024
3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: E020
DOI: https://doi.org/10.24326/ICDSUPL3.E020
Published online: 24 April 2024
ICDSUPL, 3, E020 (2024)
Environmental monitoring of V(V) ion concentration by adsorptive stripping voltammetry using a solid bismuth microelectrode
Edyta Wlazłowska1*, Małgorzata Grabarczyk1, Marzena Fiałek1
1 Department of Analytical Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Skłodowska 3, 20-031 Lublin, Poland
* Corresponding author: edyta.wlazlowska@mail.umcs.pl
Abstract
Vanadium is a transitional element that accepts oxidation states between –1 and +5, with compounds in which vanadium accepts a value of +5 being both the most persistent and the most harmful. Exposure to elevated concentrations of these compounds causes symptoms of acute or chronic poisoning, depending on the route, dose and duration of exposure. It is therefore necessary to determine trace amounts of vanadium (V) in environmental samples. Such analysis can be carried out using adsorptive stripping voltammetry (AdSV), one of the electrochemical techniques for the direct determination of metal ions in environmental water samples. This method guarantees high sensitivity and the apparatus used is relatively inexpensive. The low detection limits are due to the introduction of an accumulation step for the analyzed metal, during which the metal complex is adsorbed onto the surface of a suitably selected working electrode. Various working electrodes have been used in the voltammetric V(V) determination techniques developed to date. As mercury is the best working electrode material, mercury-based electrodes are the most widely used electrodes for the voltammetric determination of V(V) ions. However, due to the growing awareness of the harmful effects of mercury, the search for new electrode materials to replace mercury electrodes has attracted considerable interest in recent years. Consequently, mercury-free working electrodes such as the bismuth membrane electrode and the black acetylene paste electrode were used for V(V) determination in later years. Another mercury-free electrode used for the determination of V(V) by the AdSV method is the solid bismuth microelectrode. The use of this electrode made it possible to obtain a low detection limit of 2.5 × 10–10 mol L–1. Furthermore, as the measurements were carried out without deoxygenation of the solutions, the analysis could be carried out in a very short time. The use of a solid bismuth microelectrode and cupferron as complexing agents allowed a sensitive method for the determination of vanadium by the AdSV. The analysis of vanadium(V) in enriched real water samples demonstrated the suitability of the method for the analysis of environmental samples, as evidenced by recoveries between 98 and 108% and relative deviations between 3.1 and 4.2%. These results demonstrate the suitability of the proposed method for monitoring V(V) concentrations in the environment.
Keywords: vanadium, adsorptive stripping voltammetry, solid bismuth microelectrode
How to cite
E. Wlazłowska, M. Grabarczyk, M. Fiałek, 2024. Environmental monitoring of V(V) ion concentration by adsorptive stripping voltammetry using a solid bismuth microelectrode. In: 3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL3.E020