scholarly journals Detection of biological particles in ambient air using bioaerosol mass spectrometry

2006 ◽  
Author(s):  
Erica L. McJimpsey ◽  
Paul T. Steele ◽  
Keith R. Coffee ◽  
David P. Fergenson ◽  
Vincent J. Riot ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ambient Air ◽  
Biological Particles ◽  
Bioaerosol Mass Spectrometry

scholarly journals Characterization of ambient aerosols at the San Francisco International Airport using bioaerosol mass spectrometry

2006 ◽  
Author(s):  
Paul T. Steele ◽  
Erica L. McJimpsey ◽  
Keith R. Coffee ◽  
David P. Fergenson ◽  
Vincent J. Riot ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
San Francisco ◽  
Ambient Aerosols ◽  
International Airport ◽  
Bioaerosol Mass Spectrometry

scholarly journals Desorption/Ionization Fluence Thresholds and Improved Mass Spectral Consistency Measured Using a Flattop Laser Profile in the Bioaerosol Mass Spectrometry of SingleBacillusEndospores

2005 ◽  
Vol 77 (22) ◽  
pp. 7448-7454 ◽  
Author(s):  
Paul T. Steele ◽  
Abneesh Srivastava ◽  
Maurice E. Pitesky ◽  
David P. Fergenson ◽  
Herbert J. Tobias ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectral ◽  
Desorption Ionization ◽  
Bioaerosol Mass Spectrometry ◽  
Laser Profile

scholarly journals Urban Atmospheric 14CO and 14CH4 Measurements by Accelerator Mass Spectrometry

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 625-633 ◽  
Author(s):  
G A Klouda ◽  
L A Currie ◽  
D J Donahue ◽  
A J T Jull ◽  
M H Naylor
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Stratospheric Ozone ◽  
Ground Level ◽  
Ambient Air ◽  
Quality Standard ◽  
Common Source ◽  
Combustion Emissions ◽  
Ambient Air Quality Standard ◽  
Atmospheric 14Co

Atmospheric gas samples (0.1m3) were collected at ground level during January/February 1984 in Las Vegas, Nevada for 14C/13C accelerator mass spectrometry and total abundance measurements of CO and CH4. During winter months in this locale, CO concentrations can occur at 10 to 100 times background, occasionally exceeding the National Ambient Air Quality Standard (NAAQS). Methane concentrations show a slight enhancement (∼24%) above the background (non-urban troposphere) level. A comparison of CO and CH4 concentrations shows a good linear correlation which may indicate a common source. Preliminary 14C/13C results of the two species suggest that fossil emissions are the predominant source of excess CO and CH4 in the samples taken. Estimates of anthropogenic CO and CH4 are important for source apportionment of combustion emissions. In addition, this information is valuable for understanding the global CO and CH4 cycles and, therefore, human impact on climate and the stratospheric ozone layer.

Mass Spectrometry Analyses of Ions Generated by Atmospheric-Pressure Plasma Jets in Ambient Air

2015 ◽  
Vol 5 (2-4) ◽  
pp. 283-298 ◽  
Author(s):  
Tomoko Ito ◽  
Kensaku Gotoh ◽  
Kanako Sekimoto ◽  
Satoshi Hamaguchi
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Ambient Air ◽  
Plasma Jets ◽  
Pressure Plasma

scholarly journals Resonance-Enhanced Detection of Metals in Aerosols using Single Particle Mass Spectrometry

2020 ◽  
Author(s):  
Johannes Passig ◽  
Julian Schade ◽  
Ellen Iva Rosewig ◽  
Robert Irsig ◽  
Thomas Kröger-Badge ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Excimer Laser ◽  
Single Particle ◽  
Aerosol Particles ◽  
Ambient Air ◽  
Particle Mass ◽  
Anthropogenic Aerosols ◽  
Single Particle Mass Spectrometry ◽  
Krf Excimer Laser ◽  
The Impact

Abstract. We describe resonance effects in laser desorption/ionization (LDI) of particles that substantially increase the sensitivity and selectivity to metals in single particle mass spectrometry (SPMS). Within the proposed scenario, resonant light absorption by ablated metal atoms increases their ionization rate within a single laser pulse. By choosing the appropriate laser wavelength, the key micronutrients Fe, Zn and Mn can be detected on individual aerosol particles with considerably improved efficiency. These ionization enhancements for metals apply to natural dust and anthropogenic aerosols, both important sources of bioavailable metals to marine environments. Transferring the results into applications, we show that the spectrum of our KrF-excimer laser is in resonance with a major absorption line of iron atoms. To estimate the impact of resonant LDI on the metal detection efficiency in SPMS applications, we performed a field experiment on ambient air with two alternately firing excimer lasers of different wavelengths. Herein, resonant LDI with the KrF-excimer laser (248.3 nm) revealed Fe signatures for many more aerosol particles compared to the more common ArF-excimer laser line of 193.3 nm. Moreover, resonant ionization of iron appeared to be less dependent on the particle matrix than conventional non-resonant LDI, allowing a more universal and secure detection of Fe. Our findings show a way to improve the detection and source attribution capabilities of SPMS for particle-bound metals, a health-relevant aerosol component and an important source of micronutrients to the surface oceans affecting marine primary productivity.

scholarly journals Bioaerosol Mass Spectrometry for Rapid Detection of Individual Airborne Mycobacterium tuberculosis H37Ra Particles

2005 ◽  
Vol 71 (10) ◽  
pp. 6086-6095 ◽  
Author(s):  
Herbert J. Tobias ◽  
Millie P. Schafer ◽  
Maurice Pitesky ◽  
David P. Fergenson ◽  
Joanne Horn ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mycobacterium Tuberculosis ◽  
Single Cell ◽  
Direct Detection ◽  
Mass Spectral ◽  
Flight Mass Spectrometry ◽  
Bioaerosol Mass Spectrometry ◽  
Free Environment ◽  
Instrumental Development ◽  
Direct Counts

ABSTRACT Single-particle laser desorption/ionization time-of-flight mass spectrometry, in the form of bioaerosol mass spectrometry (BAMS), was evaluated as a rapid detector for individual airborne, micron-sized, Mycobacterium tuberculosis H37Ra particles, comprised of a single cell or a small number of clumped cells. The BAMS mass spectral signatures for aerosolized M. tuberculosis H37Ra particles were found to be distinct from M. smegmatis, Bacillus atrophaeus, and B. cereus particles, using a distinct biomarker. This is the first time a potentially unique biomarker was measured in M. tuberculosis H37Ra on a single-cell level. In addition, M. tuberculosis H37Ra and M. smegmatis were aerosolized into a bioaerosol chamber and were sampled and analyzed using BAMS, an aerodynamic particle sizer, a viable Anderson six-stage sampler, and filter cassette samplers that permitted direct counts of cells. In a background-free environment, BAMS was able to sample and detect M. tuberculosis H37Ra at airborne concentrations of >1 M. tuberculosis H37Ra-containing particles/liter of air in 20 min as determined by direct counts of filter cassette-sampled particles, and concentrations of >40 M. tuberculosis H37Ra CFU/liter of air in 1 min as determined by using viable Andersen six-stage samplers. This is a first step toward the development of a rapid, stand-alone airborne M. tuberculosis particle detector for the direct detection of M. tuberculosis bioaerosols generated by an infectious patient. Additional instrumental development is currently under way to make BAMS useful in realistic environmental and respiratory particle backgrounds expected in tuberculosis diagnostic scenarios.

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