[PDF] Top 20 Atmospheric Reactive Trace Gas Observations in Field and Chamber Studies Using CF₃O⁻ Chemical Ionization Mass Spectrometry
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Atmospheric Reactive Trace Gas Observations in Field and Chamber Studies Using CF₃O⁻ Chemical Ionization Mass Spectrometry
... the chemical re- actions occurring within and at the interfaces of planetary ...this field has resulted in a substantial body of knowledge about the composition and chemistry of Earth’s atmosphere, and, in ... See full document
296
Real-time measurements of gas-phase organic acids using SF6− chemical ionization mass spectrometry
... Some field studies report strong correlations be- tween formic and acetic acids, suggesting that these two or- ganic acids have similar sources (Nolte et ...major trace gases in the atmosphere, there ... See full document
18
Gas-phase pesticide measurement using iodide ionization time-of-flight mass spectrometry
... these studies are limited by the use of a quadrupole mass spectrometer, which only has unit mass resolution (m/1m ∼ 1000) and thus limits the selectivity of the ...measure trace gas ... See full document
11
Constraining Anthropogenic and Biogenic Emissions using Chemical Ionization Mass Spectrometry
... of atmospheric trace gases and particulate matter are critical for extend- ing our current knowledge of atmospheric ...execute field and laboratory experiments aimed at answering outstanding ... See full document
120
Low-pressure gas chromatography with chemical ionization mass spectrometry for quantification of multifunctional organic compounds in the atmosphere
... allowing observations of compounds that have previously proven difficult to ...laboratory studies and field ...measured using this technique, its participation in future field ... See full document
18
Application of high-resolution time-of-flight chemical ionization mass spectrometry measurements to estimate volatility distributions of -pinene and naphthalene oxidation products
... SOA mass (Ng et ...their gas-phase compositions and mechanisms have been studied in detail, and various acids have been identified in each system (Yu et ...2009). Using the Van Kreve- len diagram ... See full document
18
Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications
... low gas-phase concentrations, such as ambient aerosol precursors sulfuric acid (SA) and in- dividual highly oxidized multifunctional compounds (HOM, highly oxygenated organic molecules), which are present at ... See full document
12
Constraining the sensitivity of iodide adduct chemical ionization mass spectrometry to multifunctional organic molecules using the collision limit and thermodynamic stability of iodide ion adducts
... A mass spectromet- ric voltage scanning procedure elucidates the relative binding energies of the ion adducts, which influence the transmis- sion efficiency of molecular ions through the electric fields within the ... See full document
8
Determination of volatile alkylpyrazines in microbial samples using gas chromatography-mass spectrometry coupled with head space-solid phase microextraction
... flight mass spectrometer (GC-TOFMS) has the capability of very fast data acquisi- tion (up to 500 spectra/second) to provide a full mass spectrum for each chromatographic point (Bergknut et ...quadrupole ... See full document
8
Airborne observations of formic acid using a chemical ionization mass spectrometer
... modelling studies are needed to validate the current chem- ical transport models and help identify and quantify formic acid emission ...in chemical cycling in the tro- ...the observations in the part ... See full document
11
DEVELOPMENT AND VALIDATION OF METHOD FOR DETERMINATION OF LUTEIN BY HPLC
... However, mass spectrometric detection methods have increasingly been used in both atmospheric pressure chemical ionization and electrospray ionization modes to identify constituent ... See full document
12
Analysis of the chemical composition of atmospheric organic aerosols by mass spectrometry
... a TRACE GC2000 gas chromatograph, which was coupled to a Polaris Q ion trap mass spectrometer equipped with an external ionization source (ThermoElectron, San Jose, CA, ...carrier gas ... See full document
530
Determining the sea-air flux of dimethylsulfide by eddy correlation using mass spectrometry
... the ionization volume draws about ...decluster chamber. The balance of the gas flow exits the source and passes through a mass flow ...controller. Gas exit- ing the flow controller is ... See full document
20
Method development for the quantitative determination of short chain fatty acids in microbial samples by solid phase extraction and gas chromatography with flame ionization detection
... Four SCFAs (acetic acid, propionic acid, butyric acid, and valeric acid) and pivalic acid as an internal standard were purchased from Sigma-Aldrich (St. Louis, MO, USA). Distilled water was filtered using a ... See full document
6
Mass spectrometry and gas chromatography in chemical analysis and identification : experimental factors and case studies
... Figure 4 Average linear carrier gas velocities required for different column lengths, diameters and carrier gases to provide flow rates under directly coupled GC-MS corresponding to aver[r] ... See full document
268
Analytical Techniques for Identification and Quantification of Polycyclic Aromatic Hydrocarbons
... PAHs, for the separation of the individual PAHs the reversed phase HPLC system was prepared, the column (150 mm 5 μm HPLC) filled with C18 silica gel. The temperature of the column during the analysis was 30°C. Elution ... See full document
8
C-glycosyl flavonoids-rich extract of Dipcadi erythraeum Webb & Berthel. bulbs: Phytochemical and anticancer evaluations
... Dipcadi erythraeum was collected 120 km Cairo- Alexandria desert road, in March 2017 and identified by M. El- Shabrawy. A voucher specimen (s.n. MS6) was deposited in the herbarium of the National Research Center ... See full document
5
Enantioselective discrimination of amino acids and hexose monosaccharides in gas phase using electrospray ionization mass spectrometry
... With the aim to measure the absolute gas phase acidity (∆H) values of deoxyribonucleosides the extended kinetic method was used. A set of aromatic compounds (benzoic acid and phenol derivatives) were selected as ... See full document
23
Chemical ionization and collision induced dissociation mass spectrometry
... The spectrum recorded using carbon tetrafluoride as a collision gas, does not have particularly abundant low mass fragment ions.. A possible explanation for this deviation follows the ar[r] ... See full document
123
Analysis of the Chemical Composition of Atmospheric and Chamber Generated Aerosol Using Mass Spectrometry
... Aircraft Studies (CIRPAS) Twin Otter probed the aerosol downwind of a major cattle feedlot in the San Joaquin Valley in ...Although gas- phase measurements were not carried out, the presence of ammonia and ... See full document
378
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