Experimentally determined Henry's Law coefficients of phenol, 2-methylphenol and 2-nitrophenol in the temperature range 281–302K

Abstract

The Henry's Law coefficient is a key physical parameter in the partitioning, and hence environmental fate, of a chemical species between air and water. Despite the acknowledged polluting potential of phenol, 2-methylphenol (o-cresol) and 2nitrophenol, there is extremely poor agreement in the literature of their Henry's law coefficients and, in particular, no apparent systematic measurement of the variation with temperature. Here, a temperature-controlled column-stripping method was employed to determine Henry's Law coefficients for these compounds over the temperature range 281-302 K. Coefficients were derived from regression fits to the observed rates of losses from the liquid phase as a function of column depth in order to explicitly take account of potential non-attainment of equilibrium between liquid and gas phases. Temperature dependent expressions summarising the Henry's Law coefficients of phenol, o-cresol and 2-nitrophenol over the stated temperature range are ln H(Matm −1)=5850/T−11.6, ln H(Matm −1)=6680/T−15.4 and ln H(Matm −1)=6270/T−16.6, respectively (to within 15% of all measured values in this work). A thorough comparison with the previous literature-published values has been undertaken.

An overview of possible processes able to account for the occurrence of nitro-PAHs in Antarctic particulate matter

“…The values of the Henry's law coefficient are quite different for 2-and 4-nitrophenol [20,21], but in this case the effect is due to an intra-molecular hydrogen bonding that makes 2-nitrophenol much more hydrophobic than 4-nitrophenol. Hydrogen bonding being absent in the case of the nitronaphthalenes, limited difference can be expected between the k H ⊗ values of 1NN and 2NN.…”

Determination of Henry's law constants of organochlorine pesticides in deionized and saline water as a function of temperature

“…The water depth was selected based on previous studies indicating that the equilibrium between gas and water phases is achieved at less than 50 cm of water depth (Sahsuvar et al, 2003;Harrison et al, 2002;Jantunen and Bidleman, 2000;Bamford et al, 2000Bamford et al, , 1999. The initial aqueous concentrations were set to 15% of the solubility of p,p 0 -DDT that has the lowest water solubility among the 17 compounds.…”

Determination of Henry’s Law Constant of Formaldehyde as a Function of Temperature: Application to Air–Water Exchange in Tahtali Lake in Izmir, Turkey

“…The water depth was selected based on previous studies indicating that the equilibrium between gas and aqueousphases is achieved at less than 50 cm of water depth (Sahsuvar, Helm, Jantunen, & Bidleman, 2003;Harrison, Cape, & Heal, 2002;Jantunen & Bidleman, 2000;Bamford, Poster, & Baker, 1999;Bamford, Poster, & Baker, 2000;Betterton & Hoffman, 1988).…”