Mass Spectra
Cluster Analysis of the Organic Peaks in Bulk Mass Spectra Obtained During the 2002 New England Air Quality Study with an Aerodyne Aerosol Mass Spectrometer
... Many mass spectra in the analyzed AMS dataset were very uniform with a strong peak at m/z 44 as the main ...remaining spectra exhibited considerable variation of spectral characteristics that seemed ...
18
Source apportionment of submicron organic aerosols at an urban site by linear unmixing of aerosol mass spectra
... (PMF) was used for the first time for AMS data to identify the main components of the total organic aerosol and their sources. The PMF retrieved factors were com- pared to measured reference mass spectra ...
45
Analysis of high mass resolution PTR-TOF mass spectra from 1,3,5-trimethylbenzene (TMB) environmental chamber experiments
... particulate phase organics. The gas phase mass spectrum displayed ∼200 ion signals during the TMB photo-oxidation experiments. Molecular formulas C m H n N o O p were de- termined and ion signals were separated ...
37
Utilization of a particle beam interface for the obtaintion of mass spectra of low volatile compounds in solution.
... UTILIZATION OF A PARTICLE BEAM INTERFACE FOR THE OBTAINTION OF MASS SPEC- TRA OF LOW VOLATILE COMPOUNDS IN SOLUTION. Due to source contamination and wear- ing of instrument components problems caused by the direct ...
2
A new method to discriminate secondary organic aerosols from different sources using high-resolution aerosol mass spectra
... HR spectra was used to project OOA spectra that were extracted by PMF from ambient ...HR spectra, the eight projected chamber experiments and the set of OOA spectra from the ambient ...
15
Complex internal rearrangement processes triggered by electron transfer to acetic acid
... (TOF) mass spectra has been described elsewhere [3, ...TOF mass spectra ...Pa. Mass spectra were obtained by subtracting the background signal from the sample ...TOF mass ...
9
Aerosol source apportionment from 1 year measurements at the CESAR tower at Cabauw, NL
... mass spectra. Fractions of measured UMR signals were assigned to individual aerosol species using the fragmentation table introduced by Allan et al. (2004). Due to the au- tomated zeroing system used for ...
39
Selective measurements of isoprene and 2-methyl-3-buten-2-ol based on NO<sup>+</sup> ionization mass spectrometry
... VOCs detected in the atmosphere. Therefore Reaction (2a) only proceeds in selected cases. One such example is isoprene, exhibiting an IP of 8.84 eV. NO + ionization via charge transfer can typically be regarded as ...
22
Discrimination of beer flavours by analysis of volatiles using the mass spectrometer as an electronic nose
... the mass spectrometer and the mass spectra of the constituents of each sample were ac- quired in the run: 30 s – zero level, 90 s – building-up and 30 s – signal ...Full mass spectra of ...
7
Characterization of urban aerosol in Cork city (Ireland) using aerosol mass spectrometry
... BBOA spectra (Ul- brich et al., 2012), and with AMS mass spectra obtained from the controlled experiments of peat and coal burning obtained in this ...reference spectra for the BBOA factor ...
19
Signal Partitioning Algorithm for Highly Efficient Gaussian Mixture Modeling in Mass Spectrometry.
... of mass spectra is an approach with many potential applications includ- ing peak detection and quantification, smoothing, de-noising, feature extraction and spec- tral signal ...of mass ...
19
Complete1 H and 13 C NMR assignments and antifungal activity of two 8-hydroxy flavonoids in mixture
... The mass spectra of these flavonoids, ob- tained by high-resolution gas chromatography (HRGC) mass spectral analysis, showed intense molecular ions and [M-15] + fragments characteristic of flavonoids ...
8
Elemental ratio measurements of organic compounds using aerosol mass spectrometry: characterization, improved calibration, and implications
... The HR-ToF-AMS instrument and its data analysis proce- dures have been described in detail in previous publications (Canagaratna et al., 2007; DeCarlo et al., 2006). The HR- ToF-AMS can be usually operated in two ion ...
20
Differentiation of Bacillus pumilus and Bacillus safensis using MALDI-TOF-MS.
... mean spectra were considered for the analysis. Mass spectra were analyzed with the Data Explorer software ...experimental mass spectra that included all the ion peaks with a relative ...
10
Bioactive Compounds of Endemic Species Sideritis raeseri subsp. raeseri Grown in National Park Galičica
... LC/MS analysis was performed on an Agilent MSD TOF coupled to an Agilent 1200 series HPLC, using RR Zorbax Eclipse Plus C18 column (1.8 µm, 150 x 4.6 mm). Mobile phase A was 0.2% formic acid in water, and mobile phase B ...
8
J. Braz. Chem. Soc. vol.16 número3B
... GC-Olfatometry (GC-O) of the SPME headspace from the flowers of Z. mauritiana showed an intense fecal odor, which by comparison with the mass spectra library and after standard co-injection, confirmed the ...
3
An upgraded TOF-SIMS VG Ionex IX23LS: Study on the negative secondary ion emission of III-V compound semiconductors with prior neutral cesium deposition
... the mass spectra of the positive secondary ions before and after Cs deposition are presented in the histogram form with the peak intensities integrated within ± ...
32
Impact of aerosol composition on cloud condensation nuclei activity
... averaged mass spectra of the non-refractory aerosol and can provide mass concentrations for several species such as sulfate, nitrate, ammonium, chloride and total non- refractory organics, and the ...
8
A molecular perspective on the ageing of marine dissolved organic matter
... FT-ICR mass spectra is probably not as high as expected for natural organic matter; (ii) a compound is regarded as highly degraded, when the relative mag- nitude falls below 100 ...
36
Real-time, controlled OH-initiated oxidation of biogenic secondary organic aerosol
... also observed. OH oxidation significantly affects particle composition even for expo- sures corresponding to < 1 day of atmospheric aging, and most reaction with biogenic SOA appears complete after ∼ 3 days. The ...
42