scholarly journals Reaction Kinetics of Green Leaf Volatiles with Sulfate, Hydroxyl, and Nitrate Radicals in Tropospheric Aqueous Phase

2021 ◽  
Author(s):  
Kumar Sarang ◽  
Tobias Otto ◽  
Krzysztof Rudzinski ◽  
Thomas Schaefer ◽  
Irena Grgić ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Aqueous Phase ◽  
Green Leaf Volatiles ◽  
Green Leaf ◽  
Leaf Volatiles ◽  
Nitrate Radicals ◽  
Kinetics Of

Tropospheric Aqueous-phase Oxidation of Green Leaf Volatiles with Hydroxyl, Sulfate and Nitrate Radicals

2020 ◽  
Author(s):  
Kumar Sarang ◽  
Tobias Otto ◽  
Krzysztof Rudzinski ◽  
Irena Grgic ◽  
Klara Nestorowicz ◽  
...  
Keyword(s):  
Gas Phase ◽  
Aqueous Phase ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Green Leaf Volatiles ◽  
Phase Reaction ◽  
Leaf Volatiles ◽  
Nitrate Radicals ◽  
Kinetic Investigations ◽  
Atmospherically Relevant

<p><strong>Introduction</strong><br> Numerous green leaf volatiles (GLVs) are released into the atmosphere due to the stress, cell damage or wounding. Fog forming over vegetation takes up these compounds, promoting their aqueous-phase oxidation to less volatile compounds. The droplets eventually dry out, leaving behind the secondary organic aerosol (SOA). These pathways are still poorly recognized as potentially novel routes for the formation of atmospheric SOA. Kinetic investigations of GLVs in the gas phase have already been reported by Shalamzari et. al. 2014, Davis et. al. 2011 and many others, while there is no kinetic data on the aqueous phase reactions of selected C6 and C5 GLVs. In the present study, we focussed on the kinetic studies of GLVs with the hydroxyl, sulfate and nitrate radicals as a possible source of aqueous SOA.</p><p><strong>Experimental method</strong><br> The rate constants of reactions of GLVs with atmospherically relevant radicals were studied using a laser flash photolysis-laser long path absorption (LFP-LLPA). Kinetic investigations of GLVs with hydroxyl radicals were performed using competition kinetics, where H<sub>2</sub>O<sub>2</sub> (2 x 10<sup>-4</sup> mol L<sup>-1</sup>) was used as a radical precursor and KSCN (2 x 10<sup>-5</sup> mol L<sup>-1</sup>) as a reference compound. The method is similar to that introduced by Behar, et al. 1972. Kinetic measurements of sulfate and nitrate radicals with GLVs, were done using a direct flash photolysis method, where sodium persulfate (5 x 10<sup>-4</sup> mol L<sup>-1</sup>) was the precursor in the generation of SO<sub>4</sub><sup>•ꟷ</sup> and sodium nitrate (1 x 10<sup>-1</sup> mol L<sup>-1</sup>) and sodium sulfate (3 x 10<sup>-2</sup> mol L<sup>-1</sup>) were the precursor for the generation of nitrate radicals.</p><p><strong>Conclusions</strong><br> In the present study, we explored the kinetics of aqueous-phase reactions of three GLVs- 1-penten-3-ol, cis-2-hexen-1-ol and 2-E-hexenal - with atmospheric radicals SO<sub>4</sub><sup>•ꟷ</sup>, <sup>•</sup>OH and NO<sub>3</sub><sup>•</sup>. The second-order rate constants were determined for a temperature range of 278 K to 318 K. A weak temperature dependence was observed for the aqueous-phase kinetics of all three GLVs with selected atmospherically relevant radicals. To explain the weak temperature dependence of aqueous-phase reaction of GLVs with atmospheric radicals, rate constants were investigated for the diffusion limitation. The atmospheric significance of the aqueous-phase reaction was evaluated, by calculating aqueous-phase lifetime and their relative rate to the gas phase reactions with respective radicals, which clearly demonstrated their importance above the gas-phase reactions in tropospheric aqueous-phase. The present work is a part of the bigger research project on the aqueous-phase reactions of a series of atmospherically relevant GLVs whereas a next step oxidation products in the aqueous-phase are being investigated at a present stage. </p><p>This project is supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 711859 and by financial resources for science in the years 2017-2021 awarded by the Polish Ministry of Science and Higher Education for the implementation of an international co-financed project. The research project was also partially supported by funding under Project CREATE of European Union’s H2020 and ERASMUS PLUS staff mobility programme.</p>

Review of recent advances on the production and eco-physiological roles of green leaf volatiles

2013 ◽  
Vol 37 (3) ◽  
pp. 268-275
Author(s):  
Hai-Feng SUN ◽  
Zhen-Yu LI ◽  
Bin WU ◽  
Xue-Mei QIN
Keyword(s):  
Green Leaf Volatiles ◽  
Green Leaf ◽  
Leaf Volatiles ◽  
Recent Advances

scholarly journals Verbenone and Green-Leaf Volatiles Reduce Whitebark Pine Mortality in a Northern Range-Expanding Mountain Pine Beetle Outbreak

2021 ◽  
Author(s):  
Etienne Cardinal ◽  
Brenda Shepherd ◽  
Jodie Krakowski ◽  
Carl James Schwarz ◽  
John Stirrett-Wood
Keyword(s):  
Mountain Pine Beetle ◽  
Green Leaf Volatiles ◽  
Green Leaf ◽  
Whitebark Pine ◽  
White Pine Blister Rust ◽  
Leaf Volatiles ◽  
Disease Resistant ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Pine Trees

This is the first study testing effectiveness of semiochemical treatments to protect individual trees from a range-expanding mountain pine beetle (MPB, Dendroctonus ponderosae Hopkins) attack into newly exposed host populations of endangered whitebark pine (Pinus albicaulis Engelmann). We investigated the effectiveness of a combination of verbenone and Green-Leaf Volatiles (GLV) to protect rare and valuable disease-resistant trees during a MPB epidemic from 2015 to 2018 in Jasper National Park, Canada. Treatments reduced the proportion of trees attacked by MPB for all diameter classes, across all stands, from 46 to 60%. We also evaluated the effect of the exotic disease white pine blister rust (caused by the fungus Cronartium ribicola J.C. Fisch), the species’ other main regional threat. MPB were less likely to attack large, rust infected trees than healthy trees, emphasizing the value of the semiochemical treatment. Protecting large, cone-bearing disease-resistant whitebark pine trees is fundamental to whitebark pine recovery. Maintaining reproductive trees on the landscape increases the frequency and diversity of rust-resistant genotypes more effectively than just planting seedlings to replace MPB-killed trees, because this slow-growing species takes over 80 years to reproduce. Our study confirmed protecting large rust-resistant trees with verbenone and GLV is a proactive and effective treatment against MPB for whitebark pine in naïve populations.

Electroanalytical studies on green leaf volatiles for potential sensor development

The Analyst ◽  
2012 ◽  
Vol 137 (13) ◽  
pp. 3138 ◽  
Author(s):  
Yogeswaran Umasankar ◽  
Glen C. Rains ◽  
Ramaraja P. Ramasamy
Keyword(s):  
Green Leaf Volatiles ◽  
Green Leaf ◽  
Leaf Volatiles ◽  
Sensor Development

scholarly journals Relative contribution of LOX10, green leaf volatiles and JA to wound-induced local and systemic oxylipin and hormone signature in Zea mays (maize)

2020 ◽  
Vol 174 ◽  
pp. 112334 ◽  
Author(s):  
Yongming He ◽  
Eli J. Borrego ◽  
Zachary Gorman ◽  
Pei-Cheng Huang ◽  
Michael V. Kolomiets
Keyword(s):  
Zea Mays ◽  
Green Leaf Volatiles ◽  
Green Leaf ◽  
Leaf Volatiles ◽  
Relative Contribution
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