TY - JOUR
T1 - Aqueous nicotine solutions
T2 - PH-measurements and salting-out effects - Analysis of the effective Gibbs energies of hydration and ionic strengths of the solutions
AU - Grozdanic, Nikola D.
AU - Calado, Marta S.
AU - Kijevcanin, Mirjana Lj
AU - Serbanovic, Slobodan P.
AU - Višak, Zoran P.
N1 - Creative Commons Attribution Non-Commercial No-Derivative Works 3.0 License
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Inorganic salts
KW - Ionic liquids
KW - PH measurements of solutions
UR - http://www.scopus.com/inward/record.url?scp=84902445174&partnerID=8YFLogxK
UR - http://www.doiserbia.nb.rs/Article.aspx?ID=0352-51391300109G#.Xeob9NX7RhF
U2 - 10.2298/JSC130817109G
DO - 10.2298/JSC130817109G
M3 - Article
AN - SCOPUS:84902445174
SN - 0352-5139
VL - 79
SP - 829
EP - 842
JO - Journal of the Serbian Chemical Society
JF - Journal of the Serbian Chemical Society
IS - 7
ER -