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|Title:||Precise Measurement of Isotope Ratios with a Double-Focusing Magnetic Sector ICP Mass Spectrometer|
|Authors:||VANHAECKE Frank; MOENS Luc; DAMS Richard; TAYLOR P.d.p.|
|Citation:||Anal. Chem. vol. 68 p. 567-569|
|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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