Title: Precise Measurement of Isotope Ratios with a Double-Focusing Magnetic Sector ICP Mass Spectrometer
Authors: VANHAECKE FrankMOENS LucDAMS RichardTAYLOR P.d.p.
Citation: Anal. Chem. vol. 68 p. 567-569
Publication Year: 1996
JRC N°: JRC12733
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC12733
Type: Articles in Journals
Abstract: The potential of a commercially available double focusing magnetic sector ICP-mass spectrometer (Element, Finnigan MAT, D) for precise isotope ratio measurement at the low resolution setting (R = 300) was evaluated. Optimization of scanning conditions permitted a relative standard deviation for a set of 10 consecutive 2 min measurements of about 0.1% RSD at signal intensities of ca. 200,000 cps (peak height). This compares favourably with the best values ever reported for quadrupole ICP-MS and barely exceeds the theoretical value (counting statistics). Increasing the signal intensity to values 500,000 cps resulted in a further reduction of the RSDs obtained to values of typically 0.04%. These figures are remarkably better than those reported for commercially available quadrupole ICP-MS systems. This improvement significantly reduces the difference between isotope ratio precision of ICP-MS on one hand and those of thermal ionization mass spectrometry and plasma source multiple collector mass spectrometry on the other.
JRC Institute:Institute for Reference Materials and Measurements

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