Continuum flow sampling mass spectrometer for elemental analysis with an inductively coupled plasma ion source

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:6971112

Olivares, J A

The sampling of ions from an atmospheric pressure inductively coupled plasma for mass spectrometry (ICP-MS) with a supersonic nozzle and skimmer is shown to follow similar behavior found for neutral beam studies and of ion extraction from other plasmas and flames. The dependence of count rates for metal oxide and doubly charged ions on ICP operating parameters, and sampling interface configuration are discussed for this instrument. A simple method is described for the approximate measurement of the ion energy distribution in ICP-MS. The average ion kinetic energy, kinetic energy spread, and maximum kinetic energy are evaluated from a plot of ion signal as a function of retarding voltage applied to the quadrupole mass analyzer. The effects of plasma operating parameters on ion signals and energies are described. The interference on the ionization of cobalt by five salts, NaCl, MgCl/sub 2/, NH/sub 4/I, NH/sub 4/Br and NH/sub 4/Cl, in an ICP is first considered theoretically and subsequently the theoretical trends are established experimentally by ICP-MS. The interference trends are found to be in the order of the most easily ionized element in the matrix salt, i.e., Na > Mg > I > Br > Cl.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6971112
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM COMPOUNDS
QUALITATIVE CHEMICAL ANALYSIS
BROMIDES
CHLORIDES
COBALT
IODIDES
MAGNESIUM CHLORIDES
MASS SPECTROMETERS
DESIGN
PERFORMANCE
SODIUM CHLORIDES
EXPERIMENTAL DATA
ION SOURCES
PLASMA
SUPERSONIC FLOW
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BROMINE COMPOUNDS
CHEMICAL ANALYSIS
CHLORINE COMPOUNDS
DATA
ELEMENTS
FLUID FLOW
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IODINE COMPOUNDS
MAGNESIUM COMPOUNDS
MEASURING INSTRUMENTS
METALS
NUMERICAL DATA
SODIUM COMPOUNDS
SPECTROMETERS
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures