Affiliation:
1. Faculty of Technology and Metallurgy, Belgrade
2. Centro de Química Estrutural, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal
Abstract
This work is a continuation of our previous studies on the phase demixing -
salting-out effects - in aqueous nicotine solutions. Thus, pH measurements
were carried out 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 were not studied so far, were determined. Analysis
of the current and our 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 sodium phosphate (Na3PO4)) and ionic
liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4] or
ECOENG212?). Based on the pH measurements the effective Gibbs energies of
hydration and 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.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Cited by
5 articles.
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