Naslov
Interaction of V(V) with Humic Acid and Ferric(III) ions in aqueous solution

Autori
Knežević Lucija ; Bura-Nakić Elvira

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
6. simpozij studenata doktorskih studija PMF-a : knjiga sažetaka = 6th Faculty of Science PhD student symposium : book of abstracts / Schneider, Petra - Zagreb : Prirodoslovno-matematički fakultet Sveučilišta u Zagrebu, 2022, 69-69

ISBN
978-953-6076-93-2

Skup
6. Simpozij studenata doktorskih studija PMF-a = 6th Faculty of Science PhD Student Symposium

Mjesto i datum
Zagreb, Hrvatska, 23.04.2022. - 24.04.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
Vanadium ; Humic acid ; Ferric(III) ions ; speciation

Sažetak
Vanadium has recently been recognized as a potentially hazardous pollutant for surrounding biota in the same class as mercury, lead and arsenic [1]. While the growing industrial demand for V increases the contamination risk of natural aquatic systems, real hazardous consequences should be considered with respect to V speciation [1, 2]. Inorganic free V(V) species present the most toxic and mobile form of V. Distribution of V species in the aquatic mediums is governed by various physicochemical factors [3, 4]. Various organic ligands in natural dissolved organic matter (DOM) can participate in redox reactions thus influencing V speciation, as well [5, 6]. The interaction of vanadium (V) with humic acid (HA) was studied after applied size separation (ultrafiltration method and/or filtration) followed by anion exchange ion chromatography. The present study demonstrates the pH-dependent reducing ability of humic acid towards V(V). Speciation of V in both the dissolved and colloidal fractions of model solutions showed that V(V) is first bound by the colloidal fraction and then reduced, while reduced species were mainly present in the dissolved fraction Reduced V species show stability upon oxidation, indicating their presence in the form of apparent soluble organic complexes in the dissolved form. The effect of the above interaction was further investigated in the presence of Fe (III) ions. Our study shows that Fe(III)-humic acid promotes the binding of V(V) in the colloidal phase. The observed change in V species in aqueous solutions under the conditions used represents a valuable study that can contribute to a better understanding of V mobility and bioavailability in aqueous natural environments rich with organic matter content.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA