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Real-time measurement of sodium chloride in individual aerosol particles by mass spectrometryThe method of particle analysis by mass spectrometry has been applied to the quantitative measurement of sodium chloride in individual particles on a real-time basis. Particles of known masses are individually introduced, in the form of a beam, into a miniature Knudsen cell oven (1600 K). The oven is fabricated from rhenium metal sheet (0.018 mm thick) and is situated in the ion source of a quadrupole mass spectrometer. A particle once inside the oven is trapped and completely volatilized; this overcomes the problem of partial volatilization due to particles bouncing from the filament surface. Individual particles are thermally volatilized and ionized inside the rhenium oven, and produce discrete sodium ion pulses whose intensities are measured with the quadrupole mass spectrometer. An ion pulse width of several milliseconds (4-12 ms) is found for particles in the mass range 1.3 x 10 to the -13th to 5.4 x 10 to the -11th g. The sodium ion intensity is found to be proportional to the particle mass to the 0.86-power. The intensity distribution for monodisperse aerosol particles possesses a geometric standard deviation of 1.09, showing that the method can be used for the determination of the mass distribution function with good resolution in a polydisperse aerosol.
Document ID
19860032175
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sinha, M. P.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Friedlander, S. K.
(California, University Los Angeles, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: Analytical Chemistry
Volume: 57
Issue: 9 Au
ISSN: 0003-2700
Subject Category
Inorganic And Physical Chemistry
Accession Number
86A16913
Funding Number(s)
CONTRACT_GRANT: NSF CPE-83-18686
Distribution Limits
Public
Copyright
Other

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