Speciation in aqueous solutions of nitric acid

Abstract

In this study, speciation in aqueous solutions of nitric acid at 25 °C was assessed in two independent ways. First, Raman experiments were carried out and interpreted in terms of free nitrate ions, ion pairs and neutral HNO(3) molecules. In parallel, a model was developed to account for the formation of these two kinds of pairs. It was based on an extension of the binding mean spherical approximation (BiMSA), or associative MSA (AMSA), in which the size and the charge of the ions in the chemical pair may differ from those of the free ions. A simultaneous fit of the osmotic coefficient and of the proportion of free ions (obtained from Raman spectroscopy experiments) led to an estimation of the speciation in nitric acid solutions. The result obtained using this procedure was compared with the estimation obtained from the Raman experiments.

Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

“…(9) and (10)). Moreover, in the case of higher concentrated nitric acid solutions, the indirect radiolysis of the molecular form of HNO 3 must be considered (Hlushak et al 2013):…”

The first report on phosphonate-based homopolymers combining both chelating and thermosensitive properties of gadolinium: synthesis and evaluation

“…As previously mentioned for the influence of salt, this curve-break corresponded to the HNO 3 /amide ratio equal to 1. As a consequence, we concluded that totally dissociated 39 …”

Pierre Turq, an inspirational scientist in charge and at interfaces

“…In collaboration with Blum, Turq's group extended the MSA theory, applied in this context only to charged hard spheres, by also taking into account short-range attractive potentials. This extension was then successfully applied to the properties of actinide or lanthanide aqueous solutions also in the presence of concentrated nitric acid [13][14][15][16][17], and to bulky ions in solution as a first step toward the description of ionic liquids as alternative media for synthesis, separation or liquid-liquid extraction [18]. Reprinted from [11] with permission from Elsevier.…”