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Main Title Inductively Coupled Argon Plasma as an Ion Source for Mass Spectrometric Determination of Trace Elements.
Author Houk, Robert S. ; Fassel, Velmer A. ; Flesch, Gerald D. ; Svec, Harry J. ; Gray, Alan L. ;
CORP Author Iowa State Univ., Ames.;Environmental Research Lab., Athens, GA.
Year Published 1980
Report Number W-7405-eng-82; EPA-600/J-80-216;
Stock Number PB81-165193
Additional Subjects Mass spectroscopy ; Trace elements ; Chemical analysis ; Laboratory equipment ; Isotopes ; Argon compounds ; Water ; Heavy water ; Oxygen ; Nitrogen oxides ; Solutions ; Reprints ; Plasma spectroscopy ; Hydroxyl radical
Library Call Number Additional Info Location Last
NTIS  PB81-165193 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
Solution aerosols are injected into an inductively coupled argon plasma (ICP) to generate a relatively high number density of positive ions derived from elemental constituents. A small fraction of these ions is extracted through a sampling orifice into a differentially pumped vacuum system housing an ion lens and quadrupole mass spectrometer. The positive ion mass spectrum obtained during nebulization of a typical solvent (1 percent HNO3 in H2O) consists mainly of ArH(+), Ar(+), H3O(+), H2O(+), NO(+), O2(+), HO(+), Ar2(+), Ar2H(+), and Ar(+2). The mass spectra of the trace elements studied consist principally of singly charged monatomic (M+) or oxide (MO+) ions in the correct relative isotopic abundances. Analytical calibration curves obtained in an integration mode show a working range covering nearly 4 orders of magnitude with detection limits of 0.002-0.06 microgram per milliliter for those elements studied. This approach offers a direct means of performing trace elemental and isotopic determinations on solutions by mass spectrometry.