Chemical Ionization
Constraining Anthropogenic and Biogenic Emissions using Chemical Ionization Mass Spectrometry
... a chemical agent, separation of compounds, and detection by HPLC, GC-MS, or GC-FID (Lee et ...(tandem) chemical ionization mass spectrometry en- able online, fast, in situ measurements with no sample ...
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Application of high-resolution time-of-flight chemical ionization mass spectrometry measurements to estimate volatility distributions of -pinene and naphthalene oxidation products
... of-flight chemical ionization mass spectrometry (HR-ToF- CIMS) have made it possible to directly detect atmospheric organic compounds in real time with high sensitivity and with little or no fragmentation, ...
18
An electrospray chemical ionization source for real-time measurement of atmospheric organic and inorganic vapors
... We have developed a non-radioactive reagent ion source that deploys a custom-built electrospray setup within an at- mospheric pressure orthogonal ion–molecule reaction (IMR) chamber. The design of the IMR region is ...
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A field-deployable, chemical ionization time-of-flight mass spectrometer
... Abstract. We constructed a new chemical ionization time- of-flight mass spectrometer (CI-TOFMS) that measures at- mospheric trace gases in real time with high sensitivity. We apply the technique to the ...
9
The sensitivity of benzene cluster cation chemical ionization mass spectrometry to select biogenic terpenes
... for chemical ionization of select biogenic volatile organic ...deployable chemical ionization time-of- flight mass spectrometer (CI-ToFMS), using benzene clus- ter cation ion chemistry, for ...
12
Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications
... Multi-scheme chemical IONization in- let, MION, (Karsa ...additional ionization stage is about 10 cm, with a height of 16 ...between ionization stages and longer times achievable by increasing ...
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Airborne observations of formic acid using a chemical ionization mass spectrometer
... that chemical ionization mass spectrometry can be used to selec- tively detect gas-phase organic acids with a limit of detection below ...ical ionization mass spectrometer (CIMS) utilising I − as ...
11
Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry
... The corona ion source has been developed for a chemical ionization mass spectrometer from THS Instruments (THS Instruments LLC, USA) for the detection of sulfuric acid. The measurement relies on the ...
7
Bisulfate – cluster based atmospheric pressure chemical ionization mass spectrometer for high-sensitivity (< 100 ppqV) detection of atmospheric dimethyl amine: proof-of-concept and first ambient data from boreal forest
... Atmospheric measurements of amines are rare (Ge et al., 2011; Hanson et al., 2011; Yu et al., 2012; Freshour et al., 2014). Gas phase concentrations of these bases are usually low, and reliable measurement of atmospheric ...
11
Gas Chromatography / Chemical Ionization Mass Spectrometry of Polyethylene Glycol Monoalkyl Ethers
... soft ionization techniques such as field desorption ionization FD 7 , thermospray, liquid chromatography/mass spectrometry (LC/MS) 8 , fast atom bombardment (FAB) 9 ’ 10 , flow injection analysis/mass ...
6
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
... Recently, chemical ionization has been coupled to field de- ployable time-of-flight mass spectrometers (ToF-MS) such as the Tofwerk AG high-resolution version, commonly re- ferred to as the HRToF-CIMS ...
8
A new technique for the direct detection of HO 2radicals using bromide chemical ionization mass spectrometry (Br-CIMS): initial characterization
... Figure 1. Schematic diagram of the high-resolution time-of-flight chemical ionization mass spectrometer (HR-ToF-CIMS). Sample air enters the ion–molecule reaction region through a 0.5 mm orifice where it is ...
11
A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia
... surements were performed at an urban site 2 m above the ground level. b The Georgia Tech-CIMS was also used for the ANARChE and intercomparison with the early version of NOAA-CIMS was made. c This upgraded NOAA-CIMS for ...
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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] ...
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5512.pdf
... acetate chemical ionization mass spectrometer (CIMS) was characterized and utilized to measure SOA yields from two proposed isoprene-derived epoxides, isoprene epoxydiol (IEPOX) and methacrylic acid epoxide ...
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Investigation of glucocorticoid and local immunological function in tuberculosis and inflammation
... endogenous levels of cortisone and cortisol in human nasal and bronchoalveolar lavage fluids and plasma via gas chromatography-negative ion chemical ionization mass spectrometry. 11 be[r] ...
Iminium and enamine activation: methods for enantioselective organocatalysis
... CI: Chemical Ionization CNAcOH: Cyanoacetic acid DBA: Dibromoacetic acid DCA: Dichloroacetic acid DFA: Difluoroacetic acid DME: 1,2-Dimethoxyethane DMSO: Dimethylsulfonyl Oxide DNBA: 2,4-Dinitrobenzoic acid ...
16
Detectors Mass Spectrometry pdf
... pressure chemical ionization An APCI source relies on the formation of reactant ions and their subsequent reaction with sample ...decomposition. Chemical ion- ization of the sample is effected via ...
7
Identification of N Methyl Bis(2 (Alkyloxy Alkylphosphoryloxy)Ethyl) Amines by LC HRMS/MS
... of Chemical Warfare Agents Using Positive and Negative Ion Liquid Chromatography-Mass Spectrometry with Atmospheric Pressure Chemical ...Some Chemical Warfare ...
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Applications of SIFT MS to the Environment and Petroleum Exploration
... the chemical ionization reaction of multiple reagent ions, has helped solve complex structural mass spectrum problems that are found in the selected ion flow tube mass spectrometry (SIFT-MS) ...
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