Results 1 to 10 of about 14,298 (219)

Instrument intercomparison of glyoxal, methyl glyoxal and NO₂ under simulated atmospheric conditions [PDF]

Atmospheric Measurement Techniques, 2015
The α-dicarbonyl compounds glyoxal (CHOCHO) and methyl glyoxal (CH3C(O)CHO) are produced in the atmosphere by the oxidation of hydrocarbons and emitted directly from pyrogenic sources.
R. Thalman, M. T. Baeza-Romero, S. M. Ball, E. Borrás, M. J. S. Daniels, I. C. A. Goodall, S. B. Henry, T. Karl, F. N. Keutsch, S. Kim, J. Mak, P. S. Monks, A. Muñoz, J. Orlando, S. Peppe, A. R. Rickard, M. Ródenas, P. Sánchez, R. Seco, L. Su, G. Tyndall, M. Vázquez, T. Vera, E. Waxman, R. Volkamer   +24 more
doaj   +3 more sources

Photochemical Reactions of Glyoxal during Particulate Ammonium Nitrate Photolysis: Brown Carbon Formation, Enhanced Glyoxal Decay, and Organic Phase Formation

Environmental Science & Technology, 2022
Glyoxal is an important precursor of aqueous secondary organic aerosol (aqSOA). Its photooxidation to form organic acids and oligomers and reactions with reduced nitrogen compounds to form brown carbon (BrC) have been extensively investigated separately,
Ruifeng Zhang, Masao Gen, Zhancong Liang   +2 more
exaly   +2 more sources

Satellite Evidence for Glyoxal Depletion in Elevated Fire Plumes [PDF]

Geophysical Research Letters, 2023
Space‐borne observations are used to characterize the fate of formaldehyde and glyoxal in wildfire plumes. Their distribution measured by the Tropospheric Monitoring Instrument reveals striking differences between the two compounds near intense fires. In
C. Lerot, J.‐F. Müller, N. Theys, I. DeSmedt, T. Stavrakou, M. VanRoozendael   +5 more
doaj   +2 more sources

Selective Oxidation of Glycolaldehyde to Glyoxal Using Ruthenium Complex Catalysts. [PDF]

Chempluschem
Catalytic synthesis of glyoxal from glycolaldehyde using a ruthenium (II) complex catalyst and O2 gas was performed. Glyoxal yield reached 32%, and further oxidation of glyoxal was negligible. Furthermore, the obtained mixture containing glyoxal was precipitated by reaction with sodium sulfite, and it was confirmed that the sulfite adduct can be ...
Sagawa T, Kondo A, Hashizume M.
europepmc   +2 more sources

Seasonal in situ observations of glyoxal and methylglyoxal over the temperate oceans of the Southern Hemisphere [PDF]

Atmospheric Chemistry and Physics, 2015
The dicarbonyls glyoxal and methylglyoxal have been measured with 2,4-dinitrophenylhydrazine (2,4-DNPH) cartridges and high-performance liquid chromatography (HPLC), optimised for dicarbonyl detection, in clean marine air over the temperate Southern ...
S. J. Lawson, P. W. Selleck, I. E. Galbally, M. D. Keywood, M. J. Harvey, C. Lerot, D. Helmig, Z. Ristovski   +7 more
doaj   +3 more sources

Oligomer Formation in Evaporating Aqueous Glyoxal and Methyl Glyoxal Solutions

Environmental Science & Technology, 2006
Glyoxal and methyl glyoxal are common secondary atmospheric pollutants, formed from aromatic and terpene precursors. Both compounds are extremely water-soluble due to dihydrate formation and partition into cloudwater. In this work, FTIR-ATR and mass measurements indicate that both compounds remain primarily in the condensed phase due to oligomer ...
Kirsten W, Loeffler, Charles A, Koehler, Nichole M, Paul, David O, De Haan   +3 more
openaire   +3 more sources

Photochemical modeling of glyoxal at a rural site: observations and analysis from BEARPEX 2007 [PDF]

Atmospheric Chemistry and Physics, 2011
We present roughly one month of high time-resolution, direct, in situ measurements of gas-phase glyoxal acquired during the BEARPEX 2007 field campaign. The research site, located on a ponderosa pine plantation in the Sierra Nevada mountains, is strongly
A. J. Huisman, J. R. Hottle, M. M. Galloway, J. P. DiGangi, K. L. Coens, W. Choi, I. C. Faloona, J. B. Gilman, W. C. Kuster, J. de Gouw, N. C. Bouvier-Brown, A. H. Goldstein, B. W. LaFranchi, R. C. Cohen, G. M. Wolfe, J. A. Thornton, K. S. Docherty, D. K. Farmer, M. J. Cubison, J. L. Jimenez, J. Mao, W. H. Brune, F. N. Keutsch   +22 more
doaj   +2 more sources

Reactive uptake of glyoxal by particulate matter [PDF]

Journal of Geophysical Research, 2005
The uptake of gaseous glyoxal onto particulate matter has been studied in laboratory experiments under conditions relevant to the ambient atmosphere using an aerosol mass spectrometer. The growth rates and reactive uptake coefficients, γ, were derived by
John Liggio, Shao-Meng Li, Robert McLaren   +2 more
exaly   +2 more sources

Glyoxal retrieval from the Ozone Monitoring Instrument [PDF]

Atmospheric Measurement Techniques, 2014
We present an algorithm for the retrieval of glyoxal from backscattered solar radiation, and apply it to spectra measured by the Ozone Monitoring Instrument (OMI).
C. Chan Miller, G. Gonzalez Abad, H. Wang, X. Liu, T. Kurosu, T. Kurosu, D. J. Jacob, D. J. Jacob, K. Chance   +8 more
doaj   +2 more sources

Permeability Characteristics of Sand Grouted with Glyoxal Blended Sodium Silicate

Hittite Journal of Science and Engineering, 2017
T he goal of this study was to investigate the permeability characteristics of glyoxal blended sodium silicate injected sand specimens with different relative densities and gradations.
Eyubhan Avci
doaj   +3 more sources