Andrey I. Skorokhod, Elena V. Berezina, Konstantin B. Moiseenko, Nikolay F. Elansky, Igor B. Belikov. [2010] report values of 1.53 ± (0.06–0.08) for mixed biogenic SOA oxidized with O3, OH and low NOx. Gas permeability behavior has been evaluated with respect to 100% oxygen, carbon dioxide and nitrogen at 23 °C. Chem. Show the stereochemistry of the final product. For toluene oxidation, ozone formation in current atmospheric models is represented mainly via primary RO2, with a minor contribution from cresols (5).

Enthalpies of formation of the benzyloxyl, benzylperoxyl, hydroxyphenyl radicals and related species on the potential energy surface for the reaction of toluene with the hydroxyl radical. Atmospheric Chemistry and Physics Discussions. Schnaiter et al. Apart from the relative humidity (which increased by about 32%), the remainder of the variables have shown significant reduction, with different magnitudes, in their daily values due to the dust event compared to the values of a non-disturbed reference day. Luis Antonio Tortajada-Genaro, Esther Borrás, Amalia Muñoz. This article is cited by [2005] values are expected to be slightly higher than ours (by up to 0.02) because the measurements were made at different wavelengths. [16] The constants, ki, are multiplicative corrections for the measured voltages and should be the same for any calibration particle size. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. The carbonyl and the carbonyl oxide rearranges itself and reforms to create the stable ozonide intermediate. predict the products from the oxidative cleavage of a given alkene by potassium permanganate. The experiments on which this was based were similar to the 15 July and 23 September experiments described here, which have final mr in the 1.45–1.5 range (Figure 5), in reasonable agreement within uncertainties. The experiment had initial concentrations of 500 ppb α‐pinene and 260 ppb NO. For α‐pinene, there is some spread at lower mass concentrations, the source of which is not clear. The experimental results of outlet air temperature and number of transfer units (NTU) were compared with mathematical model. Calibration constants and multiplicative corrections for the measured voltages from the polar nephelometer used in this study. Legal. Formation and aging of secondary organic aerosol from toluene: changes in chemical composition, volatility, and hygroscopicity. Also, dihydroxymethylbenzenes generated from this pathway undergo subsequent reactions with OH to form the precursors for aerosol nucleation and growth, including small α-carbonyl compounds, organic acids, and other highly oxygenated low-volatility products. In our earlier study, we reported 1.42 ± 0.02 for photochemically generated α‐pinene SOA. The retrievals reported here use a GA method and assume size distributions are lognormal and monomodal. Processes, Information Speculation was made of kinetic pathways for the degradation of toluene to intermediate aromatic compounds and ring-opening reaction pathways to form small molecular products like 2-pentanone. Experimental Evaluation of Evaporative Cooler Using Agro Materials. See Stack-exchange. Physics, Comets and Wavelength Dependence of Refractive Index of Secondary Organic Aerosols Generated during the Ozonolysis and Photooxidation of ^|^alpha;-Pinene. The apparent decrease of mr at the highest mass concentrations (and also at the end of the experiments) might be due to changes in particle composition brought about by heterogeneous [e.g., George et al., 2007] or in‐particle reactions (Wang et al., submitted manuscript, 2010) (i.e., aging) or shifts in the composition of the condensing material. [18] Selected phase functions for the growing particles are shown in Figure 2a, including the first measurement at 1258 LT to the final measurement at 1455 LT. As expected, as particle sizes increase, scattering intensities increase. predict the products formed from the ozonolysis-reduction of a given alkene. Air is supplied to the chamber by two 33 gallon oil‐free portable air compressors (Craftsman) after passing through a series of packed bed scrubbers filled with Purafil Triple Blend (Purafil Inc.), activated charcoal, and HEPA capsule filters (Gelman). Using the Polyrate 2010A (53) and KiSThelp programs (54), the rate constants were calculated according to the canonical variational transition state theory (55⇓⇓⇓–59), along with the small curvature tunneling correction (60). 's [2007] suggestion that parent hydrocarbons with one double bond such as α‐ and β‐pinene generate SOA from the first oxidation step, thus SOA precursors do not change appreciably as the hydrocarbon is consumed, leaves open the possibility that aging plays a role. Schnaiter et al. A population size of 50 is usually sufficient, however, the larger population ensures that the solution converges and that the highly complex solution space [Hodgson, 2000] is thoroughly searched. W F L M Hoeben, F J C M Beckers, A J M Pemen, E J M van Heesch, W L Kling. To difference in their. Recent Literature. [3] Organic compounds make up a substantial fraction of atmospheric aerosols, accounting for 20−90% of aerosol mass in the lower troposphere, of which about 70% is secondary [Hallquist et al., 2009]. The obtained mass transfer coefficient ranged from 0.35 to 0.39 m/s. Sporadic Geomagnetic Pulsations at Frequencies of up to 15 HZ in the Magnetic Storm of November 7–14, 2004: Features of the Amplitude and Polarization Spectra and their Connection with Ion–Cyclotron Waves in the Magnetosphere. The first step in the mechanism of ozonolysis is the initial electrophilic addition of ozone to the Carbon-Carbon double bond, which then form the molozonide intermediate. Our yields for aerosol masses between 450–1000 μg/m3 are in good agreement at 32–50%, but very high aerosol masses appear to lead to qualitatively higher yields (55 and 97%, Table 2). Finally, particles derived from β-caryophyllene ozonolysis showed limited vapor uptake even for RH ≫ 30%. Gas‐Phase Reactions Related to Secondary Organic Aerosols. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. was supported by the National Science Foundation Graduate Research Fellowship Program. However, during the initial particle growth period (such as 1300 – 1320 LT, Figure 1b), there is a systematic error in the SMPS measurement as the particle mean size changes significantly (∼12 nm/min) during the 3 min scanning interval. Dealkylation of Alkylbenzenes: A Significant Pathway in the Toluene, o-, m-, p-Xylene + OH Reaction. The retrieved refractive index of the 26 ± 4°C experiments (all experiments shown in Figure 3 except 12 February) increases slightly as the particle mass concentration increases from about 200 to about 1100 μg/m3 from about 1.45 to 1.5. The kinetic parameters of drying of silica gel were investigated in the fixed-bed dryer. from the molecular, thermo-mechanical and structural points of view. Thirteen years of air pollution hourly monitoring in a large city: Potential sources, trends, cycles and effects of car-free days. … Author contributions: Y.J. The βsca continues to increase as particle numbers drop until 1405 LT, after which it declines slowly. Log in. Xiaoqing Wu, Can Huang, Shiyao Niu, Feng Zhang. The Lang‐Yona et al.

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[2010] very recently reported retrievals of refractive indices of SOA generated from a mixture of biogenics (mostly terpenes) released directly from plants, using cavity ring down. The atmospheric oxidation mechanism of 1,2,4-trimethylbenzene initiated by OH radicals. Adam W. Birdsall and Matthew J. Elrod . Shore, N. Study Guide and Solutions Manual for Organic Chemistry. Michael E. Jenkin, David R. Glowacki, Andrew R. Rickard and Michael J. Pilling . The results showed that the toluene conversion efficiency decreased slightly with increase of initial toluene concentration, whereas the conversion efficiency improved with an increase of illumination intensity. Yalu Liu, Qianqian Li, Guijin Su, Da Wei, Minghui Zheng, Lirong Gao, Wenbin Liu, Guorui Liu. write the equation for the cleavage of a 1,2-diol by periodic acid, and draw the structure of the probable intermediate.