Aqueous nicotine solutions:PH-measurements and salting-out effects - Analysis of the effective Gibbs energies of hydration and ionic strengths of the solutions

Abstract

This work is a continuation of previous studies on phase demixing - salting-out effects - in aqueous nicotine solutions. Thus, pH measurements were performed, allowing a brief analysis of the existing hydrogen bond interactions. Salting-out effects - the related experimental cloud point shifts - provoked by the addition of two inorganic salts, potassium nitrate and sodium sulfate, which have not hitherto been studied, were determined. Analysis of the current and previously reported salting-out/or salting-in phenomena in nicotine aqueous solutions was performed. In this respect, five studied salts were included: four inorganic salts (sodium chloride, potassium nitrate, sodium sulfate and trisodium phosphate (Na3PO4)), and ionic the liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4], commercial name ECOENG212®). Based on pH measurements, the effective Gibbs energies of hydration and the ionic strengths of the respective ternary solutions were calculated and plotted against the related cloud-point shifts caused by the addition of the salts. For the studied salts, the results and diagram obtained within this work may be used to predict the cloud-points shifts, based on the related quantities of the salts added and/or the molar Gibbs energies of hydration and/or ionic strengths requested in each case.

Publication DOI: https://doi.org/10.2298/JSC130817109G
Divisions: College of Engineering & Physical Sciences > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences
Additional Information: Creative Commons Attribution Non-Commercial No-Derivative Works 3.0 License
Uncontrolled Keywords: Inorganic salts,Ionic liquids,PH measurements of solutions,Chemistry(all)
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.dois ... 9G#.Xeob9NX7RhF (Publisher URL)
PURE Output Type: Article
Published Date: 2014
Accepted Date: 2013-10-19
Authors: Grozdanic, Nikola D.
Calado, Marta S.
Kijevcanin, Mirjana Lj
Serbanovic, Slobodan P.
Višak, Zoran P. (ORCID Profile 0000-0003-0962-8710)

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