Temperature dependencies of Henry's law constants for different plant sesquiterpenes.
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.
Institute of Technical and Natural Sciences Research-Development of "Aurel Vlaicu" University, Elena Dragoi 2, Arad 310330, Romania; Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia. Electronic address: lucian.copolovici@emu.ee.
Lucian
L
Copolovici
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia; Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia.
Ülo
Ü
Niinemets
D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D003198:Computer Simulation; D035264:Flowers / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D012717:Sesquiterpenes / Q000032:analysis* / Q000737:chemistry; D012995:Solubility; D044366:Transition Temperature; D055548:Vapor Pressure; D014835:Volatilization
D000393:Air Pollutants; D012717:Sesquiterpenes
Flower and leaf volatiles; Henry’s law constant; Partition coefficients; Sesquiterpenes; Temperature dependence