Ozonolysis of α-PINENE, β-PINENE,<i>d-</i>and<i>l</i>-Turpentine Oil Studied by Chirooptical Methods; Some Implications on the Atmospheric Chemistry of Biogenic Volatile Organic Compounds

Cataldo, Franco; Ursini, Ornella; Lilla, E.; Angelini, Giancarlo

doi:10.1080/01919512.2010.493550

Cited by 17 publications

(10 citation statements)

References 26 publications

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“…Schaub et al, 2010). For example, nopinone which was typical of EOET is an oxidation product of ␤-pinene (Cataldo et al, 2010). (E)-␤-farnesene, which was decreased by elevated temperature in our study, can be an important compound in attracting natural enemies of herbivores (Mumm et al, 2003).…”

Section: Effects Of Elevated Temperaturementioning

confidence: 84%

Sensitivity of Norway spruce physiology and terpenoid emission dynamics to elevated ozone and elevated temperature under open-field exposure

Kivimäenpää

Riikonen

Ahonen

et al. 2013

Environmental and Experimental Botany

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Section: Effects Of Elevated Temperaturementioning

confidence: 84%

Sensitivity of Norway spruce physiology and terpenoid emission dynamics to elevated ozone and elevated temperature under open-field exposure

Kivimäenpää

Riikonen

Ahonen

et al. 2013

Environmental and Experimental Botany

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“…The procedure described in detail in Cataldo et al (2010) was used. A weighed amount of ethyl oleate or ethyl elaidate (1.0-2.0 g) was charged into 1-L roundbottomed flask equipped with gas inlet and outlet valves.…”

Section: Ozonization Of Ethyl Oleate and Ethyl Elaidatementioning

confidence: 99%

Ethyl Oleate and Ethyl Elaidate Ozonides: Thermal Decomposition and Photolysis

Cataldo¹

2015

Ozone: Science & Engineering

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Highly pure ethyl oleate and ethyl elaidate were ozonized to their secondary ozonides (respectively EO-SOZ and EE-SOZ). The decomposition enthalpies of EO-SOZ and EE-SOZ were determined by DSC (Differential Scanning Calorimetry) and found, respectively, at -266 kJ/mol and -264 kJ/mol, a value much closer to the theoretically calculated upper limit of -278 kJ/mol than the decomposition enthalpy of -243 kJ/mol measured on EO-SOZ prepared from an ethyl oleate sample conforming to the European Pharmacopoeia. Although a considerable amount of heat was liberated, EO-SOZ and EE-SOZ cannot be defined as explosive based on their DSC traces at a heating rate of 10 • C/min. Pure EO-SOZ and EE-SOZ show a decomposition peak at the DSCs of 137 • C and 139 • C, respectively. The thermal decomposition of EO-SOZ and EE-SOZ was studied also by FT-IR spectroscopy showing that the decomposition involves the loss of the ozonide infrared band at 1110 cm −1 and the formation of the expected decomposition products (pelargonic acid, pelargonaldehyde, ethyl azelate, etc.). The kinetics of the photochemical decomposition of EO-SOZ and EE-SOZ were studied by FT-IR spectroscopy, and the relative rate constants were determined. EO-SOZ when overozonized forms a spin adduct with nitrosobenzene and the relative nitroxyl radical was clearly detected by the Electron Spin Resonance (ESR). Secondary ozonation products known as trioxides may be responsible for these adducts.

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“…Initial estimates of cluster numbers (1-7) were tested in sequential iterations. A silhouette index, s(i), was then used to quantitatively assess the quality of clustering, This is a composite index reflecting the compactness and separation of clusters; a larger average silhouette index indicates a better overall quality of the clustering result (Chen et al, 2002). The silhouette value of a point is a measure of the similarity of points within a given cluster compared to those in other clusters; it is defined as…”

Section: Cluster Analysismentioning

confidence: 99%

Phase transition observations and discrimination of small cloud particles by light polarization in expansion chamber experiments

et al. 2016

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Abstract. Cloud microphysical processes involving the ice phase in tropospheric clouds are among the major uncertainties in cloud formation, weather, and general circulation models. The detection of aerosol particles, liquid droplets, and ice crystals, especially in the small cloud particle-size range below 50 μm, remains challenging in mixed phase, often unstable environments. The Cloud Aerosol Spectrometer with Polarization (CASPOL) is an airborne instrument that has the ability to detect such small cloud particles and measure the variability in polarization state of their backscattered light. Here we operate the versatile Cosmics Leaving OUtdoor Droplets (CLOUD) chamber facility at the European Organization for Nuclear Research (CERN) to produce controlled mixed phase and other clouds by adiabatic expansions in an ultraclean environment, and use the CASPOL to discriminate between different aerosols, water, and ice particles. In this paper, optical property measurements of mixed-phase clouds and viscous secondary organic aerosol (SOA) are presented. We report observations of significant liquid–viscous SOA particle polarization transitions under dry conditions using CASPOL. Cluster analysis techniques were subsequently used to classify different types of particles according to their polarization ratios during phase transition. A classification map is presented for water droplets, organic aerosol (e.g., SOA and oxalic acid), crystalline substances such as ammonium sulfate, and volcanic ash. Finally, we discuss the benefits and limitations of this classification approach for atmospherically relevant concentrations and mixtures with respect to the CLOUD 8–9 campaigns and its potential contribution to tropical troposphere layer analysis.

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Ozonolysis of α-PINENE, β-PINENE,d-andl-Turpentine Oil Studied by Chirooptical Methods; Some Implications on the Atmospheric Chemistry of Biogenic Volatile Organic Compounds

Cited by 17 publications

References 26 publications

Sensitivity of Norway spruce physiology and terpenoid emission dynamics to elevated ozone and elevated temperature under open-field exposure

Sensitivity of Norway spruce physiology and terpenoid emission dynamics to elevated ozone and elevated temperature under open-field exposure

Ethyl Oleate and Ethyl Elaidate Ozonides: Thermal Decomposition and Photolysis

Phase transition observations and discrimination of small cloud particles by light polarization in expansion chamber experiments

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