Henry's Law Constants

Rolf Sander

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Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany


Henry's Law Constants




Contact, Impressum, Acknowledgements

When referring to the compilation of Henry's Law Constants, please cite this publication:

R. Sander: Compilation of Henry's law constants (version 4.0) for water as solvent, Atmos. Chem. Phys., 15, 4399-4981 (2015), doi:10.5194/acp-15-4399-2015

Henry's Law ConstantsOrganic species with other elementsSilicon (Si) → octamethylcyclotetrasiloxane

CAS RN:556-67-2

Hcp d ln Hcp / d (1/T) Reference Type Notes
[mol/(m3Pa)] [K]
7.3×10−7 Xu and Kropscott 2014 M
8.3×10−7 Xu and Kropscott 2012 M 31)
1.7×10−5 Kochetkov et al. 2001 M 115) 124)
1.7×10−5 Kochetkov et al. 2001 M 115) 125)
1.2×10−4 Hamelink et al. 1996 M 9)
1.5×10−6 Xu and Kropscott 2014 V
1.6×10−6 Kochetkov et al. 2001 V
8.3×10−7 Mazzoni et al. 1997 V
2.7×10−6 Hamelink et al. 1996 V 9)


  • Hamelink, J. L., Simon, P. B., and Silberhorn, E. M.: Henry's law constant, volatilization rate, and aquatic half-life of octamethylcyclotetrasiloxane, Environ. Sci. Technol., 30, 1946-1952, doi:10.1021/ES950634J, 1996.
  • Kochetkov, A., Smith, J. S., Ravikrishna, R., Valsaraj, K. T., and Thibodeaux, L. J.: Air-water partition constants for volatile methyl siloxanes, Environ. Toxicol. Chem., 20, 2184-2188, doi:10.1002/ETC.5620201008, 2001.
  • Mazzoni, S. M., Roy, S., and Grigoras, S.: Eco-relevant properties of selected organosilicon materials, in: The Handbook of Environmental Chemistry, Vol 3. Part H. Organosilicon Materials, edited by Chandra, G., pp. 53-81, Springer Verlag, Berlin, 1997.
  • Xu, S. and Kropscott, B.: A method for simultaneous determination of partition coefficients for cyclic volatile methylsiloxanes and dimethylsilanediol, Anal. Chem., 84, 1948-1955, doi:10.1021/AC202953T, 2012.
  • Xu, S. and Kropscott, B.: Evaluation of the three-phase equilibrium method for measuring temperature dependence of internally consistent partition coefficients (KOW, KOA, and KAW) for volatile methylsiloxanes and trimethylsilanol, Environ. Toxicol. Chem., 33, 2702-2710, doi:10.1002/ETC.2754, 2014.


Table entries are sorted according to reliability of the data, listing the most reliable type first: L) literature review, M) measured, V) VP/AS = vapor pressure/aqueous solubility, R) recalculation, T) thermodynamical calculation, X) original paper not available, C) citation, Q) QSPR, E) estimate, ?) unknown, W) wrong. See Section 3.1 of Sander (2015) for further details.


9) Value at T = 293 K.
31) Value at T = 295 K.
115) Value at T = 301 K.
124) Value obtained by applying a modified batch air-stripping method, otherwise called the vapor entry loop (VEL) method, see Kochetkov et al. (2001) for details.
125) Value obtained by applying the static head space (HS) method, see Kochetkov et al. (2001) for details.

The numbers of the notes are the same as in Sander (2015). References cited in the notes can be found here.

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