Techno Press
Techno Press

Advances in Environmental Research   Volume 7, Number 2, June 2018, pages 139-159
DOI: http://dx.doi.org/10.12989/aer.2018.7.2.139
 
Physico-chemical properties of green leaf volatiles (GLV) for ascertaining atmospheric fate and transport in fog
Harsha Vempati, Mickael Vaitilingom, Zenghui Zhang, Thilanga P. Liyana-Arachchi, Christopher S. Stevens, Francisco R. Hung and Kalliat T. Valsaraj

 
Abstract     [Full Text]
    Green Leaf Volatiles (GLVs) is a class of biogenically emitted oxygenated hydrocarbons that have been identified as a potential source of Secondary Organic Aerosols (SOA) via aqueous oxidation. The physico-chemical properties of GLVs are vital to understanding their fate and transport in the atmosphere via fog processing, but few experimental data are available. We studied the aqueous solubility, 1-octanol/water partition coefficient, and Henry\'s law constant (KH) of five GLVs at 25 ̊C: methyl jasmonate, methyl salicylate, 2-methyl-3-buten-2-ol, cis-3-hexen-1-ol, and cis-3-hexenyl acetate. Henry\'s law constant was also measured at temperatures and ionic strengths typical of fog. Experimental values are compared to scarcely-available literature values, as well as estimations using group and bond contribution methods, property-specific correlations and molecular dynamics simulations. From these values, the partition coefficients to the air-water interface were also calculated. The large Henry\'s law constant of methyl jasmonate (8091+/-1121 Mxatm-1) made it the most significant GLV for aqueous phase photochemistry. The HENRYWIN program\'s bond contribution method from the Estimation Programs Interface Suite (EPI Suite) produced the best estimate of the Henry\'s constant for GLVs. Estimations of 1-octanol/water partition coefficient and solubility are best when correlating an experimental value of one to find the other. Finally, the scavenging efficiency was calculated for each GLV indicating aqueous phase processing will be most important for methyl jasmonate.
 
Key Words
    green leaf volatiles; aerosols; Henry\'s constant; volatile organic compounds
 
Address
Harsha Vempati, Mickael Vaitilingom, Zenghui Zhang,
Thilanga P. Liyana-Arachchi, Christopher S. Stevens and Kalliat T. Valsaraj: Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, U.S.A.

Francisco R. Hung: Department of Chemical Engineering, Northeastern University, Boston, MA 02115, U.S.A.
 

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