Probing into Volumetric and Acoustic Properties of Aqueous l-Ascorbic Acid in the Presence of Diammonium Hydrogen Phosphate and Potassium Chloride

Abstract

The objective of this study is to investigate the effects of residual present-day high-grade fertilizers on human physiology. Volumetric and acoustic investigations on aqueous l-ascorbic acid (LAA) have been carried out in the presence of two fertilizers, potassium chloride (KCl) and diammonium hydrogen phosphate (DAP), to explore and analyze the solvation behavior and molecular interactions occurring in the ternary solutions [LAA + KCl/DAP + water]. Analysis of various volumetric parameters like apparent molar volume (V_ϕ), partial molar volume (V_ϕ⁰), and partial molar expansibility (E_ϕ⁰) indicates strong ion–solvent interaction. The magnitudes of Hepler’s constant mark LAA as a structure reformer in aqueous KCl and a structure breaker in aqueous DAP. Negative values of the apparent molar isentropic compressibility (K_s,ϕ) and its value at infinite dilution (E_s,ϕ⁰) show the loss of compressibility of the hydration spheres in comparison to bulk water. Transfer values as well as ion pair and triplet interactions have been evaluated. Hydration numbers have also been assessed by using Passynski’s acoustic technique. Removal of water from solvation spheres by electrolyte ions is proposed. These findings establish the dominance of ion–ion and ion–hydrophilic interactions in the examined systems.