Degradación en fase gaseosa de compuestos orgánicos oxigenados y/o pesticidas

Tesis (Doctor en Ciencias Químicas) - - Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, 2016Oxygenated volatile organic compounds (OVOC´s) are currently being investigated as an environmental friendly alternative to replace solvents, pesticides and fuel additives. Such compounds are not only emitted by industrial activities, it is known that a large proportion of OVOC's is released also into the atmosphere from biogenic sources (BVOCs) like vegetation, biomass burning, oceans and volcanic emissions. Once in the atmosphere, these compounds can contribute to the formation of secondary organic aerosols (SOA), acid rain production, along with other environmental problems associated with the photochemical air pollution and persistent organic pollutant (POPs) formation. Consequently, detailed knowledge of their chemical behavior in the atmosphere is required to assess possible implications of their widespread application. In this aspect, the electrophilic addition reactions of atmospherically relevant species (OH radicals, Cl atoms and O3 molecules) over selected OVOC's were studied. For these purposes, a series of long chain unsaturated alcohols emitted on a large scale by plants, with potential use as biopesticides was selected. On the other hand, the product distribution of the OH-initiated degradation of a man-made unsaturated ester were studied from the experimental and theoretical point of view regarding the effect of different kind of atmospheres (presence and absence of NOx). The kinetics of the reactions and products studies were obtained by different experimental systems: 80 L collapsible Teflon reaction chamber with solid phase microextraction (SPME) and GC-FID/MS. 405 L multiple pass Pyrex reaction chamber with in situ FTIR detection. 1080 L multiple pass quartz-glass reaction chamber with in situ FTIR detection. The following rate coefficients of the reactions of a series of biogenic alcohols at room temperature and atmospheric pressure were obtained (in cm3 molecule-1 s-1): BVOC kOH × 1010 cm3 molecule-1 kCl × 1010 cm3 molecule-1 kO3 × 1017 cm3 molecule-1 (E)-2-hexen-1-ol (1.010.32) (3.490.82) (5.98 ± 0.73) (E)-3-hexen-1-ol (1.200.24) (3.420.79) (5.83 ± 0.86) (Z)-3-hexen-1-ol (1.400.33) (2.940.72) (6.04 ± 0.95) (Z)-3-hepten-1-ol (1.28±0.23) (3.800.86) (Z)-3-Octen-1-ol (1.49±0.35) (4.130.68) In addition, a product study on the reactions of OH radicals with (E)-3-hexen-1-ol and (Z)-3-hepten-1-ol in the absence of NOx were determined. Molar formation yields of (377) % for propanal and (333) % for butanal where obtained as main degradation products of (E)-3-hexen-1-ol and (Z)-3-hepten-1-ol respectively. Based on the experimental data obtained, possible reactions mechanisms were postulated and their atmospheric implications assessed. Furthermore, the reactivity of different kind of electrophiles toward the OVOCs studied was correlated with their ionization potentials to calculate rate coefficients of reactions that have not been measured yet from its experimental difficulties. On the other hand, the product distribution of the gas-phase reaction of OH radicals with methyl methacrylate (MMA) in the absence of NOx was also studied at 298 K and 1 atm of air. In the absence of NOx, methyl pyruvate was identified with a yield of 76 ± 13%. In addition, a detailed quantum chemical study of the degradation of MMA was performed by density functional theory (DFT) methods. This study allow us to propose that reaction between peroxy radical (RO2•) and hydroxyl radical (OH) became relevant at NOx- free environments. The results obtained in this work allowed us to establish the atmospheric impact of these reactions and detailed photooxidation mechanisms for the VOCs studied required to develop realistic atmospheric models to help environmental policy decisions.Fil: Gibilisco, Rodrigo Gastón. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Teruel, Mariano Andrés. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Fisicoquímica; Argentina.Fil: Teruel, Mariano Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina.Fil: Santiago, Ana Noemi. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Santiago, Ana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina.Fil: Toselli, Beatriz Margarita. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Fisicoquímica; Argentina.Fil: Toselli, Beatriz Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina.Fil: Baumgartner, María Teresa. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Baumgartner, María Teresa. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina.Fil: Blesa, Miguel Angel. Universidad Nacional de San Martín; Argentina.Fil: Blesa, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

OH-initiated degradation of a series of hexenols in the troposphere: rate coefficients at 298 K and 1 atm

The kinetics of the reactions of OH radicals with three C6 unsaturated alcohols at 298 K and atmospheric pressure were investigated using solid phase microextraction (SPME) with GC-FID detection of organic compounds. Rate coefficients (in cm3 molecule1 s1 ) of k1(OH þ (E)-CH2OHCH] CH(CH2)2CH3) ¼ (1.0 0.3) 1010, k2(OH þ (E)-CH2OHCH2CH]CHCH2CH3) ¼ (1.2 0.2) 1010 and k3(OH þ (Z)-CH2OHCH2CH]CHCH2CH3) ¼ (1.4 0.3) 1010 were obtained by the relative rate method using methyl methacrylate and (E)-2-buten-1-ol as references. Rate coefficients were compared with previous determinations and reactivity trends were developed and rationalized in terms of the effect and position of substituents in the unsaturated alcohol. A correlation between the reactivity of unsaturated alcohols toward OH radicals and the energy of the HOMO of the unsaturated alcohol is presented. Additionally, product identification under atmospheric conditions was performed for the first time for these unsaturated C6 alcohols by the GCeMS technique. Butanal was observed as the main degradation product of OH with (E)-2-hexen-1-ol, in accordance with the decomposition of the 2,3-hydroxyalcoxy radicals formed. On the basis of our kinetic measurements, tropospheric lifetimes of the studied unsaturated compounds are estimated.Fil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Santiago, Ana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

Atmospheric reactivity of HC≡CCH2OH (2-propyn-1-ol) toward OH radical: Experimental determination and theoretical comparison with its alkyne analogue

The rate coefficient for the reaction of propargyl alcohol (2-propyn-1-ol, 2P1OL) with OH radicals has been determined using gas chromatography with a flame ionization detector (GC/FID) at 298 K and atmospheric pressure. The experimental value obtained by the relative method using methyl methacrylate and butyl acrylate as references was (2.05 ± 0.30) × 10−11 cm3 per molecule per s. The present value was compared with previous determinations and a theoretical study of the reaction was performed in order to explain the differences in reactivity of the alcohol with that of the corresponding alkyne (propyne, P). A full discussion of the addition and abstraction mechanisms was developed for 2P1OL at the density functional and ab initio composite model levels. It was found that addition is much faster than abstraction for propyne but occurs at approximately the same rate for 2P1OL. In this last case, however, abstraction of hydrogen from the C1 carbon leads to a complex which can react further to yield addition products. Thermodynamic and kinetic data calculated for these reactions suggest that the products would be the 1,2- and 1,3-propanediol radicals. These products would react further with O2, in the case where it is present in the reaction mixture.Fil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Kieninger, Martina. Universidad de la República; UruguayFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Ventura, Oscar. Universidad de la República; Urugua

Gas-phase oxidation of CH2 = C(CH3)CH2Cl initiated by OH radicals and Cl atoms: Kinetics and fate of the alcoxy radical formed

Relative kinetics of the reactions of OH radicals and Cl atoms with 3‐chloro‐2‐methyl‐1‐propene has been studied for the first time at 298 K and 1 atm by GC‐FID. Rate coefficients are found to be (in cm3 molecule−1 s−1): k1 (OH + CH2 = C(CH3)CH2Cl) = (3.23 ± 0.35) × 10−11, k2 (Cl + CH2 = C(CH3)CH2Cl) = (2.10 ± 0.78) × 10−10 with uncertainties representing ± 2σ. Product identification under atmospheric conditions was performed by solid phase microextraction/GC‐MS for OH reaction. Chloropropanone was identified as the main degradation product in accordance with the decomposition of the 1,2‐hydroxy alcoxy radical formed. Additionally, reactivity trends and atmospheric implications are discussed.Fil: Rivela Fretes, Cynthia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

Primera determinación en tiempo real de la contaminación del aire por material particulado (PM) en la Ciudad de San Miguel de Tucumán

Resulta importante monitorear la calidad del aire para determinar el impacto que este puede tener en la región respecto a los estándares que indica la OMS. En este sentido, la iniciativa Breathe2Change1 tiene como objetivo instalar la primera red de monitoreo de aire utilizando Módulos Integrados de Sensores Ambientales (MISAs) en la provincia de Tucumán. Los módulos constan de un contador óptico de partículas para la determinación de concentración de material particulado PM10, PM2,5 y PM1, un sensor de CO2 y otro de parámetros atmosféricos.Los datos obtenidos son transmitidos en tiempo real a una plataforma de acceso público, con la intención de servir como herramienta de información civil. En este sentido, se presentan las primeras mediciones realizadas en la ciudad de San Miguel de Tucumán, región que forma parte de la red de monitoreo provincial que está en proceso de instalación.Fil: Elizondo, Jazmín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; ArgentinaFil: Reynoso Posse, Facundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; ArgentinaFil: Ben Altabef, Aida. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; ArgentinaFil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; ArgentinaV Congreso Nacional de Ciencia y Tecnología Ambiental, Argentina y Ambiente; 4º Simposio Iberoamericano de AdsorciónPoero de los FunesArgentinaUniversidad Nacional de San Lui

Atmospheric degradation of CH2C(CH3)C(O)OCH3 initiated by OH radicals: Mechanistic study and quantification of CH3C(O)C(O)OCH3 in NOx free air

The product distribution of the gas-phase reaction of OH radicals with methyl methacrylate (CH2═C(CH3)C(O)OCH3, MMA) in the absence of NOx was studied at 298 K and atmospheric pressure of air. The experiments were performed in a Teflon chamber using solid-phase microextraction (SPME) with GC–MS and GC–FID for product identification and quantification, respectively. In the absence of NOx, methyl pyruvate (CH3C(O)C(O)OCH3) was identified with a yield of 76 ± 13% in accordance with the decomposition of the 1,2-hydroxyalkoxy radicals formed. In addition, a detailed quantum chemical study of the degradation of MMA was performed by density functional theory (DFT) methods using the MPWB1K functional. This calculation suggests that formation of methyl pyruvate, from C1–C2 scission of 1,2-hydroxyalkoxy radical, is kinetically and thermodynamically the most favorable reaction path taking into account the electronic properties of reaction intermediates and transition states. The difference observed on the degradation mechanism of MMA in the presence and absence of NOx was explained in terms of the associated thermochemistry. Furthermore, this study propose that reaction between peroxy radical (RO2•) and hydroxyl radical (OH) became relevant at NOx-free environments. This statement is in agreement with recent studies concerning small peroxy radicals such as CH3OO•.Fil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Uranga, Jorge Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Santiago, Ana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

FTIR kinetic study of the reactions of γ-caprolactone and γ-heptalactone initiated by Cl and OH radicals at 298 K and atmospheric pressure

Rate coefficients were determined for the reactions of the furanones (C6H10O2) (C7H12O2) with OH radicals (k1 and k2) and with Cl atoms (k3 and k4) at 298 K, to be (in cm3 molecule−1 s−1): k1 = (6.4 ± 1.4) × 10−12, k2 = (8.8 ± 1.9) × 10−12, k3 = (1.30 ± 0.41) × 10−10, k4 = (1.70 ± 0.34) × 10−10, respectively. kOH correlates with kCl and SAR show C5 as the favored site of H abstraction.Fil: Baptista Ruiz, Andrea Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Wiesen, Peter. Bergische Universität Wuppertal; AlemaniaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

Rate coefficients at 298 K and 1 atm for the tropospheric degradationof a series of C6,C7and C8biogenic unsaturated alcohols initiated by Clatoms

Rate coefficients for the gas-phase reactions of Cl atoms with a series of unsaturated biogenic alcohols at 298 ± 3 K and 1 atm have been measured by the relative technique in an environmental chamber with in situ FTIR detection of reactants. The rate coefficients obtained using 1-butene and isobutene as reference compounds were (in units of 10−10 cm3 molecule−1 s−1): k1((E)-2-hexen-1-ol) = (3.49 ± 0.82), k2((E)-3-hexen-1-ol) = (3.42 ± 0.79), k3 ((Z)-3-hexen-1-ol) = (2.94 ± 0.72), k4((Z)-3-hepten-1-ol) = (3.80 ± 0.86) and k5((Z)-3-octen-1-ol) = (4.13 ± 0.68). This work constitutes the first kinetic study of the reactions cited above. The rate coefficients are compared with those for other unsaturated alcohols and a correlation between the reactivity of unsaturated alcohols toward Cl atoms and the energy of the HOMO of the unsaturated alcohols is presented. Based on the obtained results, the atmospheric lifetimes of the unsaturated alcohols have been estimated and possible atmospheric implications assessed.Fil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Bejan, Iustinian. Universität Wuppertal. Wuppertal; Alemania. Al. I. Cuza” University. Iasi; RumaniaFil: Barnes, Ian. Universität Wuppertal. Wuppertal; AlemaniaFil: Wiesen, Peter. Universität Wuppertal. Wuppertal; AlemaniaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

FTIR gas kinetic study of the reactions of ozone with a series of hexenols at atmospheric pressure and 298 K

Relative rate coefficients of the reactions of O3 with (Z)-3-hexen-1-ol, (E)-3-hexen-1-ol and (E)-2-hexen-1-ol have been determined in an environmental chamber with in situ FTIR detection of the reactants at 298 K and 760 Torr. The following rate coefficients (in units of 10−17 cm3 molecule−1 s−1) have been determined: (6.04 ± 0.95) for (Z)-CH2(OH)CH2CHCHCH2CH3; (5.83 ± 0.86) for (E)-CH2(OH)CH2CHCHCH2CH3; (5.98 ± 0.73) for (E)-CH2(OH)CHCH(CH2)2CH3. This is the first kinetic study for the reactions of O3 with (E)-2-hexen-1-ol and (E)-3-hexen-1-ol. Reactivity trends are developed and the atmospheric persistence of these compounds is calculated based on the rate coefficientsFil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Bejan, Iustinian. Bergische Universität Wuppertal; Alemania. “Al. I. Cuza” University; RumaniaFil: Barnes, Ian. Bergische Universität Wuppertal; AlemaniaFil: Wiesen, Peter. Bergische Universität Wuppertal; AlemaniaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin

Kinetics and mechanism of the Cl-initiated oxidation of 4-tert-butylcyclohexanone at atmospheric conditions: Reactivity, SARs and fate of the alkoxy radicals formed

The rate coefficient of the gas-phase reaction of 4-tert-butylcyclohexanone (4-TBCH) with Cl atoms was determined by the relative method in a Teflon collapsible chamber with GC-FID detection to be k4-TBCH= (2.84 ± 0.40) × 10−10 and in a glass photoreactor with in situ FT-IR detection to be k4-TBCH= (2.74 ± 0.64) × 10−10. As an average value of the GC-FID and FT-IR techniques, it is recommended k4-TBCH= (2.79 ± 0.34) × 10−10 (all values in cm3 molecule−1 s−1) at 298 K and 760 Torr. Reactivity trends were developed with respect to the nature and position of the substituents in the cycle of the Volatile Organic Compounds (VOCs) compared. On the other hand, Structure Activity Relationship (SAR) were performed and compared with the kinetic data obtained in the present work and used to predict the more favorable site of H abstraction in the cyclic ketone. In addition, the products formed under atmospheric conditions were identified for the first time by SPME/GC-MS and FT-IR detection. Acetone, formaldehyde, pivalaldehyde, pivalic acid and a chlorinated alkane were the main products identified. The tropospheric lifetimes of 4-TBCH were calculated from the rate coefficients determined for this cyclic ketone, indicating that the main degradation pathway will be the reaction with OH radicals with a local impact, where Cl atoms could be a significant sink of this ketone in coastal areas. In this sense, the tropospheric ozone creation potential of 4-TBCH and their photooxidation products were determined. The ketone studied 4-TBCH and the 1,4-cyclohexanedione identified as a product are the major ozone producers and other oxygenated products as formaldehyde or pivalaldehyde, showed a moderate photochemical smog production.Fil: Baptista Ruiz, Andrea Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Blanco, Maria Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Gibilisco, Rodrigo Gastón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Teruel, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentin