A thermodynamic model for vanadate in aqueous solution – equilibria and reaction enthalpies

Vanadium: Global (bio)geochemistry

“…Vanadium has a notable tendency to polymerize, forming species containing up to 10 atoms of V (Wanty and Goldhaber, 1992). Polynuclear species have enhanced stability, as shown using reaction enthalpy for V 4 and V 5 cyclic species (McCann et al, 2013). Eleven soluble poly-nuclear species have been reported by Petterson et al (1983) and fourteen are listed in Martell and Smith (2004) containing 2, 3, 4, 5, 6 or 10 atoms of vanadium ( Table 2).…”

Continuous Liquid Phase Synthesis of Europium and Bismuth Co-Doped Yttrium Vanadate Nanophosphor Using Microwave Heating

“…In the case of as-aged (Ref) sample, (Y,Eu,Bi)-hydroxide, which does not react with orthovanadate ions, might still remain in the gel. After microwave heating, by-products such as metavanadate and/or poly-vanadate might be yielded due to the variation of pH under heating [38]. As shown in Fig.…”

Carbonate complexes of vanadate

“…The interactions between these species and the associated temperature dependent equilibrium constants were taken from our previous work [36]. As shown previously [36], each of these species exhibits an NMR signal at a slightly different chemical shift. The chemical shift of each peak reflects the relative molarity of the different protonation states within each species, according to Eq.…”

“…Although it is generally accepted that vanadates increase the kinetics of CO 2 absorption, little is known about the mechanism associated with this process [35]. Both we [36] and others [37] have shown that a combination of 51 V NMR spectroscopy and potentiometric titrations are ideal for investigating the equilibria associated with the complex vanadate system. Here, we extend this work to incorporate the interaction of bicarbonate with the vanadate system.…”