Lucien Copolovici and Ülo Niinemets have published another so-called cinder-block paper (find out what it means from here) about the Henry´s law constants. This time for plant sesquiterpenes. The paper is titled in a rather straightforward manner as: “Temperature dependencies of Henry’s law constants for different plant sesquiterpenes” and it is published in a journal called Chemosphere (link to paper). It very much reminds a paper publised by Lucien and Ülo in the same journal exactly ten years ago, which is titled: “Temperature dependencies of Henry’s law constants and octanol/water partition coefficients for key plant volatile monoterpenoids” (link to paper)…
Full citation: Copolovici, L., & Niinemets, Ü. (2015). Temperature dependencies of Henry’s law constants for different plant sesquiterpenes. Chemosphere, 751-757. (link to full text)
Sesquiterpenes are plant-produced hydrocarbons with important ecological functions in plant-to-plant and plant-to-insect communication, but due to their high reactivity they can also play a significant role in atmospheric chemistry. So far, there is little information of gas/liquid phase partition coefficients (Henry’s law constants) and their temperature dependencies for sesquiterpenes, but this information is needed for quantitative simulation of the release of sesquiterpenes from plants and modeling atmospheric reactions in different phases. In this study, we estimated Henry’s law constants (Hpc) and their temperature responses for 12 key plant sesquiterpenes with varying structure (aliphatic, mono-, bi- and tricyclic sesquiterpenes). At 25°C, Henry’s law constants varied 1.4-fold among different sesquiterpenes, and the values were within the range previously observed for monocyclic monoterpenes. Hpc of sesquiterpenes exhibited a high rate of increase, on average ca. 1.5-fold with a 10°C increase in temperature (Q10). The values of Q10 varied 1.2-fold among different sesquiterpenes. Overall, these data demonstrate moderately high variation in Hpc values and Hpc temperature responses among different sesquiterpenes. We argue that these variations can importantly alter the emission kinetics of sesquiterpenes from plants.