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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

BOBADILLA, Roberto; HUYBRECHTS, Tom; DEWULF, Jo  and  LANGENHOVE, Herman Van. DETERMINATION OF THE HENRY'S CONSTANT OF VOLATILE AND SEMI-VOLATILE ORGANIC COMPONUDS OF ENVIRONMENTAL CONCERN BY THE BAS (BATCH AIR STRIPPING) TECHNIQUE: A NEW MATHEMATICAL APPROACH. J. Chil. Chem. Soc. [online]. 2003, vol.48, n.3, pp.7-11. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072003000300001.

Chemical transfer between environmental compartments plays a key role in an adequate command and control of pollutants. The gas-liquid partitioning equilibrium constant, better known as the Henry's constant (KH) represents a crucial parameter in order to determine the environmental fate of chemicals and therefore, an accurate determination at ambient conditions is extremely important to assess the mentioned process. Within the experimental dynamic methods, the batch air stripping technique (BAS) has as major drawback the equilibrium condition among phases, which is hardly achieved in open natural systems. The present work, based on previously published mathematical models (4, 22), centers in the development of a new mathematical approach to determine KH by means of the BAS in non-equilibrium conditions through experimental and theoretical determinations of volumetric mass transfer coefficients (KLa) for volatile (1,1-DCE, ethylbenzene, p-xylene and toluene) and semivolatile (1,1,2-TCE, 1,2-DCP, penhylmethylether (anisole) and naphthalene) organic compounds of environmental concern. In order to validate the approach, values obtained were compared to the KH determined through the static EPICS (Equilibrium Partitioning in Closed Systems) method, confirming the calculated KH and ratifying the new approach

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