PMID: 11482643Aug 3, 2001

A critical compilation of Henry's law constant temperature dependence relations for organic compounds in dilute aqueous solutions

Chemosphere
J Staudinger, P V Roberts

Abstract

A comprehensive compilation of published studies reporting directly measured experimental determinations of Henry's law constant (HLC) temperature dependence relationships for organic compounds in dilute, non-saline aqueous solutions under ambient conditions was conducted. From this effort, 55 such studies (covering 204 organic compounds) were identified, critically reviewed, summarized and discussed. Of the 204 compounds, 57 were studied in more than one investigation. For the 57 'multi-studied' compounds, relatively good agreement (averaging within 20-30%) was found between the results from different investigations. Given such results, a 'consensus' relationship (i.e., an average temperature dependence relation) was generated for each of the multi-studied compounds. Overall, considering relations established for 197 of the 204 compounds investigated (the results for the other 7 compounds being excluded due to poor correlation coefficients), the average slope of the temperature dependence line was found to correspond to an increase in HLC values by a factor of 1.88 (i.e., an 88% increase) per 10 degrees C rise in temperature (thermodynamically equivalent to an average enthalpy of volatilization of 47 kJ/mole). The associated r...Continue Reading

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