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Showing 1 to 14 of 14 for “"Chemical Ionization Mass Spectrometry"”.
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A study of the tropospheric oxidation of volatile organic compounds using chemical ionization mass spectrometry
… turbulent, discharge-flow technique coupled to a chemical ionization mass spectrometer. The ability to accurately model tropospheric chemistry depends on kinetic and mechanistic information for a wide variety of species. The gas-phase chemistry of the troposphere is dominated by the oxidation of …
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Applications of Soft Chemical Ionization Mass Spectrometry: Taking the next steps along the journey of breath analysis
Contains fulltext : 289476.pdf (Publisher’s version ) (Open Access)
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Development of an analytical method to quantify the oxidative deoxyribose damage product 3'-phosphoglycolaldehyde induced by radiation, iron and peroxynitrite
… extraction and gas chromatography/negative chemical ionization/mass spectrometry. A stable isotopically-labeled [13C2]-PGA is synthesized and used as an internal standard. The method is linear in response over the range of 30 fmol to 300 pmol and precision is verified by analysis of a …
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Novel preparation of endohedral metallofullerenes via laser vaporization of fullerene/metal pellets
… Vaporized samples were analyzed by negative-ion chemical ionization mass spectrometry and by normal phase HPLC. Inert atmospheres of helium, argon, and xenon were compared for optimization of yields of endohedral metallofullerenes, as well as for production of unique endohedral species not …
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Aqueous-phase Organic Chemistry in the Atmosphere
… topic. An online analytical technique, Aerosol Chemical Ionization Mass Spectrometry (Aerosol CIMS), was employed to quantitatively monitor aqueous-phase OH oxidation of glyoxal and methylglyoxal. Quantification of all the major reaction products was achieved, permitting complete reaction …
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Chemistry of carbonaceous aerosols : studies of atmospheric processing and OH-initiated oxidation
… and laboratory studies to probe the physico-chemical properties of soot and organic aerosols in a complimentary approach to obtain information essential for understanding their atmospheric evolution and environmental effects. Samples of particulate matter < 2.5 pm in diameter (PM2.5) were …
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Supercritical Fluid Extraction of Nylon 6,6 Fiber Finish and Oligomers
… HPLC with coupled on-line atmospheric pressure chemical ionization mass spectrometry (APCI-MS) and HPLC fractionation coupled with off-line Liquid Secondary Ion Mass Spectrometry (LSIMS).
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Elucidating the chemistry of particulate and chlorinated nitrates in the troposphere through method development, and chamber and field studies
… of nitryl chloride (ClNO2) were measured by chemical ionization mass spectrometry (CIMS) during the ORCA campaign in July 2015 on the west coast of Vancouver Island. Mean ClNO2 mixing ratios were small (< 10 pptv) with a maximum of 46 pptv, in part due to low precursor concentrations, i.e., …
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Measurement of Pernitric Acid, Hydrogen Chloride, and Sulfur Dioxide during the Intercontinental Chemical Transport Experiment Campaign
… measurements of HO2NO2, HCl and SO2 using chemical ionization mass spectrometry (CIMS) during the Intercontinental Chemical Transport Experiment (INTEX) field campaign, an intensive study to characterize the chemical composition of the troposphere in the eastern United States, Mexico City, …
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Emissions and Chemistry of Reactive Nitrogen in Wildfire Plumes
… authentic smoke, including radical sources, photochemical evolutions, and secondary pollutant formation. I demonstrate that the emission ratios of nitrous acid (HONO) from fires may be significantly underestimated in previous studies where measurements were not close enough to fire sources, …
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Surfactant Behavior in Atmospheric Aerosols
… formation of light-absorbing products, Aerosol chemical ionization mass spectrometry (Aerosol-CIMS) to characterize the reaction products, and a continuous flow streamwise thermal gradient cloud condensation nuclei counter (CFSTGC) to measure the CCN activity. We found that organic films of …
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Trace Gas-Induced Brine and Disordered Interfacial Layers on Ice
… of DILs can still significantly impact air-ice chemical reactions. Next we examined the interaction of HNO_3 with water ice for partial pressures 2×10^-8 Torr to 1×10^-5 Torr and at temperatures from 216 to 256 K using (i) the surface-specific technique ellipsometry and (ii) a coated wall flow …
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Investigation of the composition of linear alkylbenzenes with emphasis on the identification and quantitation of some trace compounds using GS/MS system in both electron impact and chemical ionization modes
… alkylbenzene samples. A gas chromatography/mass spectrometry, (GCIMS) study was performed o~ five samples from the same manufacturer (different production dates) and then it was followed by the analyses of ten commercial linear alkylbenzenes from four different suppliers. All the major …