Monte carlo-based distance analysis using unit mass resolution ICP-MS data for shellfish site of origin verification

2015 ◽  
Vol 11 (3) ◽  
pp. 515-516
Author(s):  
Joseph F Mudge ◽  
Marc E Engel ◽  
Caitlin N Ryan ◽  
David M Klein†
Keyword(s):  
Monte Carlo ◽  
Mass Resolution ◽  
Unit Mass ◽  
Distance Analysis ◽  
Icp Ms ◽  
Unit Mass Resolution

scholarly journals Nano-LC FTICR Tandem Mass Spectrometry for Top-Down Proteomics: Routine Baseline Unit Mass Resolution of Whole Cell Lysate Proteins up to 72 kDa

2012 ◽  
Vol 84 (5) ◽  
pp. 2111-2117 ◽  
Author(s):  
Jeremiah D. Tipton ◽  
John C. Tran ◽  
Adam D. Catherman ◽  
Dorothy R. Ahlf ◽  
Kenneth R. Durbin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Mass Resolution ◽  
Unit Mass ◽  
Tandem Mass ◽  
Top Down ◽  
Whole Cell ◽  
Whole Cell Lysate ◽  
Cell Lysate ◽  
Unit Mass Resolution

scholarly journals Enhancing non-refractory aerosol apportionment from an urban industrial site through receptor modeling of complete high time-resolution aerosol mass spectra

2014 ◽  
Vol 14 (15) ◽  
pp. 8017-8042 ◽  
Author(s):  
M. L. McGuire ◽  
R. Y.-W. Chang ◽  
J. G. Slowik ◽  
C.-H. Jeong ◽  
R. M. Healy ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Mass Spectra ◽  
Organic Aerosol ◽  
Mass Resolution ◽  
Receptor Modeling ◽  
Unit Mass ◽  
Organic Mass ◽  
Aerosol Mass ◽  
Inorganic Species ◽  
Unit Mass Resolution

Abstract. Receptor modeling was performed on quadrupole unit mass resolution aerosol mass spectrometer (Q-AMS) sub-micron particulate matter (PM) chemical speciation measurements from Windsor, Ontario, an industrial city situated across the Detroit River from Detroit, Michigan. Aerosol and trace gas measurements were collected on board Environment Canada's Canadian Regional and Urban Investigation System for Environmental Research (CRUISER) mobile laboratory. Positive matrix factorization (PMF) was performed on the AMS full particle-phase mass spectrum (PMFFull MS) encompassing both organic and inorganic components. This approach compared to the more common method of analyzing only the organic mass spectra (PMFOrg MS). PMF of the full mass spectrum revealed that variability in the non-refractory sub-micron aerosol concentration and composition was best explained by six factors: an amine-containing factor (Amine); an ammonium sulfate- and oxygenated organic aerosol-containing factor (Sulfate-OA); an ammonium nitrate- and oxygenated organic aerosol-containing factor (Nitrate-OA); an ammonium chloride-containing factor (Chloride); a hydrocarbon-like organic aerosol (HOA) factor; and a moderately oxygenated organic aerosol factor (OOA). PMF of the organic mass spectrum revealed three factors of similar composition to some of those revealed through PMFFull MS: Amine, HOA and OOA. Including both the inorganic and organic mass proved to be a beneficial approach to analyzing the unit mass resolution AMS data for several reasons. First, it provided a method for potentially calculating more accurate sub-micron PM mass concentrations, particularly when unusual factors are present, in this case the Amine factor. As this method does not rely on a priori knowledge of chemical species, it circumvents the need for any adjustments to the traditional AMS species fragmentation patterns to account for atypical species, and can thus lead to more complete factor profiles. It is expected that this method would be even more useful for HR–ToF–AMS data, due to the ability to understand better the chemical nature of atypical factors from high-resolution mass spectra. Second, utilizing PMF to extract factors containing inorganic species allowed for the determination of the extent of neutralization, which could have implications for aerosol parameterization. Third, subtler differences in organic aerosol components were resolved through the incorporation of inorganic mass into the PMF matrix. The additional temporal features provided by the inorganic aerosol components allowed for the resolution of more types of oxygenated organic aerosol than could be reliably resolved from PMF of organics alone. Comparison of findings from the PMFFull MS and PMFOrg MS methods showed that for the Windsor airshed, the PMFFull MS method enabled additional conclusions to be drawn in terms of aerosol sources and chemical processes. While performing PMFOrg MS can provide important distinctions between types of organic aerosol, it is shown that including inorganic species in the PMF analysis can permit further apportionment of organics for unit mass resolution AMS mass spectra.

scholarly journals Enhancing non-refractory aerosol apportionment from an urban industrial site through receptor modelling of complete high time-resolution aerosol mass spectra

2014 ◽  
Vol 14 (4) ◽  
pp. 5081-5145 ◽  
Author(s):  
M. L. McGuire ◽  
R. Y.-W. Chang ◽  
J. G. Slowik ◽  
C.-H. Jeong ◽  
R. M. Healy ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Mass Spectra ◽  
Organic Aerosol ◽  
Mass Resolution ◽  
Unit Mass ◽  
Organic Mass ◽  
Aerosol Mass ◽  
Receptor Modelling ◽  
Inorganic Species ◽  
Unit Mass Resolution

Abstract. Receptor modelling was performed on quadrupole unit mass resolution aerosol mass spectrometer (Q-AMS) sub-micron particulate matter (PM) chemical speciation measurements from Windsor, Ontario, an industrial city situated across the Detroit River from Detroit, Michigan. Aerosol and trace gas measurements were collected on board Environment Canada's CRUISER mobile laboratory. Positive matrix factorization (PMF) was performed on the AMS full particle-phase mass spectrum (PMFFull MS) encompassing both organic and inorganic components. This approach was compared to the more common method of analysing only the organic mass spectra (PMFOrg MS). PMF of the full mass spectrum revealed that variability in the non-refractory sub-micron aerosol concentration and composition was best explained by six factors: an amine-containing factor (Amine); an ammonium sulphate and oxygenated organic aerosol containing factor (Sulphate-OA); an ammonium nitrate and oxygenated organic aerosol containing factor (Nitrate-OA); an ammonium chloride containing factor (Chloride); a hydrocarbon-like organic aerosol (HOA) factor; and a moderately oxygenated organic aerosol factor (OOA). PMF of the organic mass spectrum revealed three factors of similar composition to some of those revealed through PMFFull MS: Amine, HOA and OOA. Including both the inorganic and organic mass proved to be a beneficial approach to analysing the unit mass resolution AMS data for several reasons. First, it provided a method for potentially calculating more accurate sub-micron PM mass concentrations, particularly when unusual factors are present, in this case, an Amine factor. As this method does not rely on a priori knowledge of chemical species, it circumvents the need for any adjustments to the traditional AMS species fragmentation patterns to account for atypical species, and can thus lead to more complete factor profiles. It is expected that this method would be even more useful for HR-ToF-AMS data, due to the ability to better understand the chemical nature of atypical factors from high resolution mass spectra. Second, utilizing PMF to extract factors containing inorganic species allowed for the determination of extent of neutralization, which could have implications for aerosol parameterization. Third, subtler differences in organic aerosol components were resolved through the incorporation of inorganic mass into the PMF matrix. The additional temporal features provided by the inorganic aerosol components allowed for the resolution of more types of oxygenated organic aerosol than could be reliably resolved from PMF of organics alone. Comparison of findings from the PMFFull MS and PMFOrg MS methods showed that for the Windsor airshed, the PMFFull MS method enabled additional conclusions to be drawn in terms of aerosol sources and chemical processes. While performing PMFOrg MS can provide important distinctions between types of organic aerosol, it is shown that including inorganic species in the PMF analysis can permit further apportionment of organics for unit mass resolution AMS mass spectra.

Unit Mass Resolution

2016 ◽  
Author(s):  
Kermit K. Murray ◽  
Robert K. Boyd ◽  
Marcos N. Eberlin ◽  
G. John Langley ◽  
Liang Li ◽  
...  
Keyword(s):  
Mass Resolution ◽  
Unit Mass ◽  
Unit Mass Resolution

scholarly journals Analysis of high-precision vanadium isotope ratios by medium resolution MC-ICP-MS

2016 ◽  
Vol 31 (2) ◽  
pp. 531-536 ◽  
Author(s):  
Sune G. Nielsen ◽  
Jeremy D. Owens ◽  
Tristan J. Horner
Keyword(s):  
High Precision ◽  
Mass Spectrometer ◽  
Inductively Coupled Plasma ◽  
Isotope Ratios ◽  
Mass Resolution ◽  
New Method ◽  
Inductively Coupled ◽  
Medium Resolution ◽  
Medium Mass ◽  
Icp Ms

We present and verify a new method to measure vanadium isotope ratios using a Thermo Scientific Neptune multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) operated in medium mass resolution mode.

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