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Journal articles on the topic 'GC/VUV'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Hodgson, Alex, and Jack Cochran. "Vacuum Ultraviolet Spectroscopy as a New Tool for GC Analysis of Terpenes in Flavors and Fragrances." Journal of AOAC INTERNATIONAL 102, no. 2 (March 1, 2019): 655–58. http://dx.doi.org/10.5740/jaoacint.18-0284.

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Abstract Background: Traditional detectors such as flame ionization detection and MS have issues with coeluting isomers like terpenes; however, unique vacuum UV (VUV) absorbance spectra can be used to deliberately compress chromatography. Objective: Deconvolution capabilities under various run conditions of GC-MS and GC-VUV arecompared. Methods: A standard terpenes mix and tea tree essential oil were run on both GC-MS (63 and 14 min run times) and GC-VUV (22, 11, and 7 min run times). Results: The three GC-VUV methods showed good precision for10 terpenes, as well as with the 63 min GC-MS method. The 14 min GC-MS method struggled precisely quantifying some terpenes. Highlights: GC-VUV allows for faster run times while providing the same level of quantitative accuracy.

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2

Cruse, Courtney A., Jingzhi Pu, and John V. Goodpaster. "Identifying Thermal Decomposition Products of Nitrate Ester Explosives Using Gas Chromatography–Vacuum Ultraviolet Spectroscopy: An Experimental and Computational Study." Applied Spectroscopy 74, no. 12 (October 8, 2020): 1486–95. http://dx.doi.org/10.1177/0003702820915506.

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Analysis of nitrate ester explosives (e.g., nitroglycerine) using gas chromatography–vacuum ultraviolet spectroscopy (GC–VUV) results in their thermal decomposition into nitric oxide, water, carbon monoxide, oxygen, and formaldehyde. These decomposition products exhibit highly structured spectra in the VUV that is not seen in larger molecules. Computational analysis using time-dependent density functional theory (TDDFT) was utilized to investigate the excited states and vibronic transitions of these decomposition products. The experimental and computational results are compared with those in previous literature using synchrotron spectroscopy, electron energy loss spectroscopy (EELS), photoabsorption spectroscopy, and other computational excited state methods. It was determined that a benchtop GC–VUV detector gives comparable results to those previously reported, and TDDFT could predict vibronic spacing and model molecular orbital diagrams.

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3

Wang, Frank Cheng-Yu. "GC × VUV Study of Diesel: A Two-Dimensional Separation Approach." Energy & Fuels 34, no. 2 (February 4, 2020): 1432–37. http://dx.doi.org/10.1021/acs.energyfuels.9b03383.

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4

Abou Mrad, Ninette, Fabrice Duvernay, Thierry Chiavassa, and Grégoire Danger. "Methanol ice VUV photoprocessing: GC-MS analysis of volatile organic compounds." Monthly Notices of the Royal Astronomical Society 458, no. 2 (February 15, 2016): 1234–41. http://dx.doi.org/10.1093/mnras/stw346.

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5

Bai, Ling, Jonathan Smuts, Jamie Schenk, Jack Cochran, and Kevin A. Schug. "Comparison of GC-VUV, GC-FID, and comprehensive two-dimensional GC–MS for the characterization of weathered and unweathered diesel fuels." Fuel 214 (February 2018): 521–27. http://dx.doi.org/10.1016/j.fuel.2017.11.053.

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6

Roberson, Zackery R., and John V. Goodpaster. "Differentiation of structurally similar phenethylamines via gas chromatography–vacuum ultraviolet spectroscopy (GC–VUV)." Forensic Chemistry 15 (August 2019): 100172. http://dx.doi.org/10.1016/j.forc.2019.100172.

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7

Roberson, Zackery R., Heather C. Gordon, and John V. Goodpaster. "Instrumental and chemometric analysis of opiates via gas chromatography–vacuum ultraviolet spectrophotometry (GC-VUV)." Analytical and Bioanalytical Chemistry 412, no. 5 (January 3, 2020): 1123–28. http://dx.doi.org/10.1007/s00216-019-02337-5.

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8

Dunkle, Melissa N., Pascal Pijcke, William L. Winniford, Matthijs Ruitenbeek, and George Bellos. "Method development and evaluation of pyrolysis oils from mixed waste plastic by GC-VUV." Journal of Chromatography A 1637 (January 2021): 461837. http://dx.doi.org/10.1016/j.chroma.2020.461837.

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9

Wang, Frank Cheng-Yu. "Comprehensive Two-Dimensional Gas Chromatography Hyphenated with a Vacuum Ultraviolet Spectrometer To Analyze Diesel—A Three-Dimensional Separation (GC × GC × VUV) Approach." Energy & Fuels 34, no. 7 (June 24, 2020): 8012–17. http://dx.doi.org/10.1021/acs.energyfuels.0c00688.

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10

Dunkle, Melissa N., Pascal Pijcke, Bill Winniford, and George Bellos. "Quantification of the composition of liquid hydrocarbon streams: Comparing the GC-VUV to DHA and GCxGC." Journal of Chromatography A 1587 (February 2019): 239–46. http://dx.doi.org/10.1016/j.chroma.2018.12.026.

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11

Braun, A. M., I. G. Pintori, H. P. Popp, Y. Wakahata, and M. Würner. "Technical development of UV-C- and VUV-photochemically induced oxidative degradation processes." Water Science and Technology 49, no. 4 (February 1, 2004): 235–40. http://dx.doi.org/10.2166/wst.2004.0272.

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Technical development work is presented, where the VUV photochemically induced oxidative degradation is used: (i) for analytic purposes, and (ii) for small to medium scale (<10 m2/d) waste water treatment processes or ultrapure water production. In the first case, small Xe-excimer radiation sources with an integrated reaction space designed for optimal conditions, as far as incident photon flux density, turbulence and concentration of dissolved molecular oxygen are concerned, have been built and tested. Under conditions of exhaustive oxidation and/or mineralization of pollutants in a continuous regime, they may be used for sample pre-treatment modules prior TOC, TOX and electrochemical trace metal analysis. Under conditions of partial oxidation or mineralization, the same lamp/reactor combination may be used for functionalization purposes prior to e.g. GC or HPLC analyses. In the second case, mass transfer limitations between the non-irradiated bulk volume and the irradiated volume are overcome by the electrochemical generation of molecular oxygen within or close to the irradiated volume and by the design of the photochemical part of the reactor.

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12

Kranenburg, Ruben F., Chris K. Lukken, Peter J. Schoenmakers, and Arian C. van Asten. "Spotting isomer mixtures in forensic illicit drug casework with GC–VUV using automated coelution detection and spectral deconvolution." Journal of Chromatography B 1173 (May 2021): 122675. http://dx.doi.org/10.1016/j.jchromb.2021.122675.

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13

Cruse, Courtney A., and John V. Goodpaster. "Optimization of gas chromatography/vacuum ultraviolet (GC/VUV) spectroscopy for explosive compounds and application to post-blast debris." Forensic Chemistry 26 (December 2021): 100362. http://dx.doi.org/10.1016/j.forc.2021.100362.

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14

Cruse, Courtney A., and John V. Goodpaster. "Thermal and spectroscopic analysis of nitrated compounds and their break-down products using gas chromatography/vacuum UV spectroscopy (GC/VUV)." Analytica Chimica Acta 1143 (January 2021): 117–23. http://dx.doi.org/10.1016/j.aca.2020.11.041.

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15

Kranenburg, Ruben F., Alan R. García-Cicourel, Corina Kukurin, Hans-Gerd Janssen, Peter J. Schoenmakers, and Arian C. van Asten. "Distinguishing drug isomers in the forensic laboratory: GC–VUV in addition to GC–MS for orthogonal selectivity and the use of library match scores as a new source of information." Forensic Science International 302 (September 2019): 109900. http://dx.doi.org/10.1016/j.forsciint.2019.109900.

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16

GRICE, S. C., W. R. FLAVELL, A. G. THOMAS, S. WARREN, P. G. MARR, D. E. JEWITT, N. KHAN, P. M. DUNWOODY, and S. A. JONES. "ELECTRONIC STRUCTURE AND REACTIVITY OF TM-DOPED La1-xSrxCoO3 (TM = Ni, Fe) CATALYSTS." Surface Review and Letters 09, no. 01 (February 2002): 277–83. http://dx.doi.org/10.1142/s0218625x02002191.

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The catalytic properties of LaCoO 3 in the oxidation of organic molecules in aqueous solution are explored as a function of doping with both Sr substitution for La and Fe and Ni substitution for Co. VUV photoemission is used to explore the surface reactivity of the ceramic catalysts in aqueous solution, using H 2 O as a probe molecule. These measurements are complemented by EXAFS and XANES measurements designed to probe the local defect structure and by GC measurements of catalytic activity in the aqueous epoxidation of crotyl alcohol. We relate the observed catalytic activity to the defect structure of the doped materials. In Ni-doped materials, oxygen vacancies appear to be the predominant defect, whereas in Fe-doped samples, electron holes are stabilised on Fe, leading to very different behaviour in oxidation. The surface reactivity to water is also influenced by the TM d electron count, with water binding more strongly to Fe-doped materials than to those containing Ni. The influence of these factors on the rate of the unwanted hydrogen peroxide decomposition reaction and hence on activity in epoxidation is discussed.

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17

Jen, Coty N., Lindsay E. Hatch, Vanessa Selimovic, Robert J. Yokelson, Robert Weber, Arantza E. Fernandez, Nathan M. Kreisberg, Kelley C. Barsanti, and Allen H. Goldstein. "Speciated and total emission factors of particulate organics from burning western US wildland fuels and their dependence on combustion efficiency." Atmospheric Chemistry and Physics 19, no. 2 (January 25, 2019): 1013–26. http://dx.doi.org/10.5194/acp-19-1013-2019.

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Abstract. Western US wildlands experience frequent and large-scale wildfires which are predicted to increase in the future. As a result, wildfire smoke emissions are expected to play an increasing role in atmospheric chemistry while negatively impacting regional air quality and human health. Understanding the impacts of smoke on the environment is informed by identifying and quantifying the chemical compounds that are emitted during wildfires and by providing empirical relationships that describe how the amount and composition of the emissions change based upon different fire conditions and fuels. This study examined particulate organic compounds emitted from burning common western US wildland fuels at the US Forest Service Fire Science Laboratory. Thousands of intermediate and semi-volatile organic compounds (I/SVOCs) were separated and quantified into fire-integrated emission factors (EFs) using a thermal desorption, two-dimensional gas chromatograph with online derivatization coupled to an electron ionization/vacuum ultraviolet high-resolution time-of-flight mass spectrometer (TD-GC × GC-EI/VUV-HRToFMS). Mass spectra, EFs as a function of modified combustion efficiency (MCE), fuel source, and other defining characteristics for the separated compounds are provided in the accompanying mass spectral library. Results show that EFs for total organic carbon (OC), chemical families of I/SVOCs, and most individual I/SVOCs span 2–5 orders of magnitude, with higher EFs at smoldering conditions (low MCE) than flaming. Logarithmic fits applied to the observations showed that log (EFs) for particulate organic compounds were inversely proportional to MCE. These measurements and relationships provide useful estimates of EFs for OC, elemental carbon (EC), organic chemical families, and individual I/SVOCs as a function of fire conditions.

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18

Roberson, Zackery R., and John V. Goodpaster. "Optimization of the qualitative and quantitative analysis of cocaine and other drugs of abuse via gas chromatography – Vacuum ultraviolet spectrophotometry (GC – VUV)." Talanta 222 (January 2021): 121461. http://dx.doi.org/10.1016/j.talanta.2020.121461.

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19

Cruse, Courtney A., and John V. Goodpaster. "Generating highly specific spectra and identifying thermal decomposition products via Gas Chromatography / Vacuum Ultraviolet Spectroscopy (GC/VUV): Application to nitrate ester explosives." Talanta 195 (April 2019): 580–86. http://dx.doi.org/10.1016/j.talanta.2018.11.060.

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20

Schenk, Jamie, Doug D. Carlton, Jonathan Smuts, Jack Cochran, Lindsey Shear, Ty Hanna, Danny Durham, Cal Cooper, and Kevin A. Schug. "Lab-simulated downhole leaching of formaldehyde from proppants by high performance liquid chromatography (HPLC), headspace gas chromatography-vacuum ultraviolet (HS-GC-VUV) spectroscopy, and headspace gas chromatography-mass spectrometry (HS-GC-MS)." Environmental Science: Processes & Impacts 21, no. 2 (2019): 214–23. http://dx.doi.org/10.1039/c8em00342d.

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21

Zhang, Peng, Pengkun Ma, Haixu Zhang, Jinian Shu, Bo Yang, and Zhen Li. "Application of VUV-PIMS coupled with GC-MS in chemical characterization, identification and comparative analysis of organic components in both vehicular-derived SOA and haze particles." Atmospheric Environment 164 (September 2017): 250–58. http://dx.doi.org/10.1016/j.atmosenv.2017.06.013.

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22

Cruse, Courtney A., and John V. Goodpaster. "Corrigendum to “Generating highly specific spectra and identifying thermal decomposition products via Gas Chromatography / Vacuum Ultraviolet Spectroscopy (GC/VUV): Application to nitrate ester explosives” [Talanta 195 (2019) 580–586]." Talanta 220 (December 2020): 121529. http://dx.doi.org/10.1016/j.talanta.2020.121529.

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23

Lelevic, Aleksandra, Christophe Geantet, Maxime Moreaud, Chantal Lorentz, and Vincent Souchon. "Quantification of Hydrocarbons in Gas Oils by GC×GC-VUV: Comparison with Other Techniques." Energy & Fuels, August 24, 2022. http://dx.doi.org/10.1021/acs.energyfuels.2c01960.

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24

Jitendrakumar, Patel Visha, and Dr Alisha Patel. "Review on Quantification of Mineral Oil Aromatic Hydrocarbon (MOAH) from Cosmetics by Analytical Method." International Journal of Pharmaceutical Sciences Review and Research 68, no. 2 (June 15, 2021). http://dx.doi.org/10.47583/ijpsrr.2021.v68i02.003.

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Mineral oils which consists mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH), which are largely applied in various consumer products like medicines cosmetics etc. MOAH which is potential public health hazard because it include carcinogenic polycyclic compounds. There is a rapid method for quantifying MOAH by proton nuclear magnetic resonance spectroscopy (1H qNMR) in anhydrous cosmetics. The 1H qNMR method is a good complement to the LC-GC-FID method. Another method is a simple and fast developed that uses columns packed with silver-modified silica in supercritical fluid chromatography with flame ionization and UV detection (SFC-FID/UV) for the determination of mineral oil saturated hydrocarbons (MOSH) and also mineral oil aromatic hydrocarbons (MOAH) in purified mineral oil samples. Another method which is based on gas chromatography with vacuum ultraviolet detection (GC-VUV) and relies on the spectral differences between the aliphatic and aromatic compounds in the sample. The detector provides a good selectivity for aromatics, direct quantification of the MOAH content is possible without the need for a laborious pre-separation of the mineral oil. GC-VUV method good sensitive for the analysis of all but gives highest purity mineral oils.

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25

Fethi, Fouad, Juan López-Gejo, Martin Köhler, and André M. Braun. "Vacuum-UV- (VUV-) Photochemically Initiated Oxidation of Dimethylamine in the Gas Phase." Journal of Advanced Oxidation Technologies 11, no. 2 (January 1, 2008). http://dx.doi.org/10.1515/jaots-2008-0204.

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AbstractThe vacuum ultraviolet (VUV-) photochemical oxidation of dimethylamine in the gas phase was investigated in the presence and absence of molecular oxygen and water vapor. Primary intermediate products of the oxidative degradation were identified by the combination of gas chromatography and mass spectrometry (GC/MS), and the product distribution was determined for different experimental conditions. The evolution of the substrate concentration was followed by on-line gas chromatography. The production of CO

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26

Reavis, Madison, and John Goodpaster. "Quantitative analysis of smokeless powder particles in post‐blast debris via gas chromatography/vacuum ultraviolet spectroscopy ( GC / VUV )." Journal of Forensic Sciences, April 3, 2022. http://dx.doi.org/10.1111/1556-4029.15037.

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