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Chemosphere

Title:		Solubility of volatile organic compounds in aqueous ammonia solution
Author(s):		Gorgenyi M; Dewulf J; Van Langenhove H; Kiraly Z;
Address:		"Institute of Physical Chemistry, University of Szeged, Rerrich B. ter 1, H-6723 Szeged, Hungary. gorgenyi@chem.u-szeged.hu"
Journal Title:		Chemosphere
Year:		2005
Volume:		59
Issue:		8
Page Number:		1083 - 1090
DOI:		10.1016/j.chemosphere.2004.12.012
ISSN/ISBN:		0045-6535 (Print) 0045-6535 (Linking)
Abstract:		"The Ostwald solubility coefficient, L of 17 volatile organic compounds (VOCs) from the gas phase into water and dilute aqueous ammonia solutions was determined by the equilibrium partitioning in closed system-solid phase micro extraction (EPICS-SPME) method at 303 K and at 0-2.5 mol dm(-3) ammonia concentrations. Ammonia increased the solubility of all VOCs nearly linearly, but to a different extent. The difference in the solubility values in aqueous ammonia solutions (Lmix) compared to pure water (L) is explained on the basis of a Linear Solvation Energy Relationship (LSER) equation made applicable for solvent mixtures, logLmix - logL = x((sNH3 - sH2O)pi2H + (aNH3 - aH2O)Sigma2H + (bNH3 - bH2O)Sigmabeta2H + (vNH3 - VH2O)Vx). sNH3 - sH2O, aNH3 - aH2O, bNH3 - bH2O, vNH3 - vH2O are the differences of solvent parameters, x is the mole fraction, pi2H is the solute dipolarity-polarizability, Sigmaalpha2H is the effective hydrogen bond acidity of the solute, Sigmabeta2H is the effective hydrogen bond basicity of the solute and Vx, the McGowan characteristic volume. The most significant term was v, the phase hydrophobicity. The solubility behavior was explained by the change in structure of the aqueous solution: the presence of ammonia reduces the cavity effect. These findings show that the presence of compounds such as ammonia, frequently observed in environmental waters, especially wastewaters, affect the fugacity of VOCs, having consequences for the environmental partitioning of VOCs and having technical consequences towards wastewater treatment technologies"
Keywords:		"Ammonia/*chemistry *Models, Chemical Organic Chemicals/*chemistry Phase Transition Solubility Volatilization Water/*chemistry Water Purification/methods;"
Notes:		"MedlineGorgenyi, Miklos Dewulf, Jo Van Langenhove, Herman Kiraly, Zoltan eng Comparative Study Research Support, Non-U.S. Gov't England 2005/04/19 Chemosphere. 2005 May; 59(8):1083-90. doi: 10.1016/j.chemosphere.2004.12.012"