Determination of Henry's law constant using diffusion in air and water boundary layers

Hwang Lee, Hyo Jung Kim, Jung Hwan Kwon

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A simple and precise method for determining the Henry's law constant for hydrophobic organic chemicals was developed. Henry's law constants were obtained as air-water partition coefficients in a dilute solution from the two partition coefficients between polydimethylsiloxane (PDMS) and air (K PDMSa) and between PDMS and water (K PDMSw). Measurements of the low concentrations in air or water at phase equilibrium were avoided. Instead, the K PDMSa and K PDMSw values were obtained by measuring the mass transfer rate constants in a boundary layer and relating them with K PDMSa and K PDMSw using a film diffusion model. Twenty hydrophobic chemicals (11 polycyclic aromatic hydrocarbons, 5 chlorinated benzenes, 2 phthalate esters, and 2 aromatic nitro musks) with literature values of the Henry's law constant ranging from 10 -2 to 10 2 Pa·m 3·mol -1 were chosen to evaluate the method. The Henry's law constants derived in this study agreed very well with the experimentally determined values from the literature. Because the proposed method provides a fast and simple method for measuring the Henry's law constant within three days, it is a very promising method for generating the Henry's law constants widely used in the assessment of the environmental fate of hydrophobic chemicals.

Original languageEnglish
Pages (from-to)3296-3302
Number of pages7
JournalJournal of Chemical and Engineering Data
Issue number11
Publication statusPublished - 2012 Nov 8
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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