The Henryʹs law coefficient of 2-nitrophenol over the temperature range 278–303 K

Although 2-nitrophenol has been identified as an important environmental chemical there is scarcity in the literature regarding the temperature dependence of its Henryʹs law coefficient, H. Here a bubble purge method was used to measure H for 2-nitrophenol over the temperature range 278–303 K. A novel approach in the data treatment allowed correction of the data for non-equilibrium partitioning in the apparatus to obtain the true equilibrium H value. The experimentally derived temperature-dependent expression for H of 2-nitrophenol is lnH (M atm−1)=(6290/T (K))−16.6. The standard enthalpy and entropy of gas-to-liquid transfer for 2-nitrophenol in aqueous solution are −52.3±8.1 kJmol−1 and −138±28 Jmol−1 K−1, respectively. (Errors are 95% confidence intervals.)