[PDF] Top 20 A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia
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A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia
... (to produce “zero” gases). There was another PFA tee be- tween the scrubber housing and the 3-way valve, which was attached to a pump to constantly suck out 100–200 sccm over the scrubber, to prevent the ambient ... See full document
13
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
... Example mass spectra from (a) DMA/EA, (b) ammonia, (c) TMA/PA and (d) a C4- amine ...zero measurements in ...while ammonia and TMA/PA show clear and moderate reduction upon zero mea- surement, ... See full document
11
Using collision-induced dissociation to constrain sensitivity of ammonia chemical ionization mass spectrometry (NH4+ CIMS) to oxygenated volatile organic compounds
... Kroll, J. H., Donahue, N. M., Jimenez, J. L., Kessler, S. H., Cana- garatna, M. R., Wilson, K. R., Altieri, K. E., Mazzoleni, L. R., Wozniak, A. S., Bluhm, H., Mysak, E. R., Smith, J. D., Kolb, C. E., and Worsnop, D. R.: ... See full document
10
A high-resolution time-of-flight chemical ionization mass spectrometer utilizing hydronium ions (H 3O ToF-CIMS) for measurements of volatile organic compounds in the atmosphere
... maximizing mass resolution of the ToF analyzer before the ...prevents mass discrimination as the result of MCP aging (Müller et ...SONGNEX, mass spectra were averaged and stored to 10 Hz and were ... See full document
18
A chemical ionization mass spectrometer for continuous underway shipboard analysis of dimethylsulfide in near-surface seawater
... have had considerable success with shower-head style equili- brators and similar devices should be examined for use with DMS (Johnson, 1999). The moderate solubility of DMS in seawater means that equilibrium with the gas ... See full document
10
Real-time measurements of gas-phase organic acids using SF6− chemical ionization mass spectrometry
... the ambient air through a hole in the trailer’s ...the ambient sampling port of the pipe to reduce the influence of crosswinds on the pipe’s flow dy- ...between ambient and background modes. In ... See full document
18
Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement
... In ambient air masses, the larger part of the signal at m/z 59 with the RF discharge is due to acetic acid, which sometimes displays variability on the timescale of ...PAN measurements to more polluted ... See full document
20
Large daytime signals of N2O5 and NO 3inferred at 62 amu in a TD-CIMS: chemical interference or a real atmospheric phenomenon?
... selective ionization process resulting from the reaction be- tween a reagent ion and the target compounds, with the gen- erated ions detected by a mass ...measure ambient N 2 O 5 and ... See full document
12
New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate
... fundamental chemical mechanisms leading to nucleation and growth of ...the chemical species contri- buting to nucleation and growth of nanoparticles have yet to be unambiguously ...eld measurements ... See full document
49
A new technique for the direct detection of HO 2radicals using bromide chemical ionization mass spectrometry (Br-CIMS): initial characterization
... nominal mass-to-charge ratios, m/z 112 and m/z 114 cor- responding to the 79 Br and 81 Br isotopes, ...fractional mass-to-charge ratios of ...unit mass resolution, only the unit mass ... See full document
11
Measurements of tropospheric HO 2and RO2 by oxygen dilution modulation and chemical ionization mass spectrometry
... i.e. measurements at low altitudes in dry arctic ...on ambient pressure and temperature for a series of minimum relative humidi- ties at which peroxy radicals can be measured without any modifications to ... See full document
22
Size-resolved online chemical analysis of nanoaerosol particles: a thermal desorption differential mobility analyzer coupled to a chemical ionization time-of-flight mass spectrometer
... minimum mass concentration of the analyte aerosol (pg m −3 ) which is needed to perform ...an ambient study with different background aerosol conditions, temperature, gas-phase concentrations and sample ... See full document
18
Exploring Fundamental Aspects of Proteomic Measurements: Increasing Mass Measurement Accuracy, Streamlining Absolute Quantification, and Increasing Electrospray Response
... negative chemical ionization source (NCI), which had been fitted to the unoccupied end of a linear ion trap ...hybrid mass spectrometers, McLuckey and co-workers have recently developed different ... See full document
174
Airborne observations of formic acid using a chemical ionization mass spectrometer
... More measurements and in-depth 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- ... See full document
11
An aircraft-borne chemical ionization – ion trap mass spectrometer (CI-ITMS) for fast PAN and PPN measurements
... ion chemical behaviour within the mea- surement uncertainty of most MS systems, and provides cali- bration throughout the whole flight, because it does not inter- fere with the product ion of the measured ... See full document
16
A field-deployable, chemical ionization time-of-flight mass spectrometer
... For measurements made during CalNex, we calculate a 3 σ and 10 σ value of 4 pptv and 13 pptv, respectively (for 1-s ...our measurements dur- ing CalNex, and indicates that if we were to characterize the ... See full document
9
Identification of N Methyl Bis(2 (Alkyloxy Alkylphosphoryloxy)Ethyl) Amines by LC HRMS/MS
... of mass spectra in the MS database, it is very difficult for the laboratories of Member States of OPCW to identify these new ...tandem mass spectrometry (LC-HRMS/MS) is one of the most favored analytical ... See full document
9
Ambient Ionization and Miniature Mass Spectrometry Systems for Disease Diagnosis and Therapeutic Monitoring
... of ambient ionization for direct sampling ionization certainly helps to strip down the system required for MS analysis, since no equipment would be needed for sample cleaning up or chromatographic ... See full document
14
Dermatophyte Identification Using Matrix Assisted Laser Desorption Ionization–Time of Flight Mass Spectrometry
... desorption ionization–time of flight (MALDI- TOF) mass spectrometer (MS) for the identification of dermatophytes from clinical cultures was compared to that of dermatophyte identification using 28S ... See full document
5
<p>Investigation Of Small Molecular Substances As Potential Biomarkers For Discrimination Of Gastric Tumor</p>
... using mass spectroscopy ...electrospray ionization-MS (iEESI-MS) 3,10,11 is a method that ef fi ciently provides mole- cular information within the body volume and characterizes analytes distributed in ... See full document
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