Simultaneous measurement of ion ratios by inductively coupled plasma-mass spectrometry with a twin-quadrupole instrument

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Applied Spectroscopy; (United States)

DOI:https://doi.org/10.1366/0003702944027958· OSTI ID:6879860

Warren, A R; Allen, L A; Pang, H; Houk, R S ^[1]; Janghorbani, M ^[2]

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1. Ames Laboratory-U.S. Department of Energy, Department of Chemistry, Iowa State University, Ames, Iowa 50011 (United States)
2. Center for Stable Isotope Research, Inc., 5411 S. Hyde Park Road, Chicago, Illinois 60615 (United States)

The ion beam from the inductively coupled plasma (ICP) is split into two parts by a device comprised of two electrostatic analyzers in a back-to-back arrangement. Each ion beam is then monitored by a separate quadrupole mass analyzer and electron multiplier. Thus, ion ratios can be measured simultaneously without scanning. Isotope ratios for copper are measured with a precision of 0.14% relative standard deviation (RSD). Internal standard ratios for Co[sup +]/La[sup +] are measured with a precision of 1% RSD. Ion signals in the two channels are highly correlated, and the magnitude of flicker noise is reduced in the resulting ratios. Bias in the measured isotope ratios is substantial but can be corrected by calibration.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6879860
• Journal Information: Applied Spectroscopy; (United States), Journal Name: Applied Spectroscopy; (United States) Vol. 48:11; ISSN 0003-7028; ISSN APSPA4
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
BEAM FOCUSING MAGNETS
BEAM SPLITTING
BEAMS
CHARGED PARTICLES
CHEMICAL ANALYSIS
COPPER IONS
DESIGN
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
ION BEAMS
IONS
ISOTOPE RATIO
MAGNETS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MULTIPOLES
OPERATION
QUADRUPOLES
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROMETERS