Isotopic precision for a lead species (PbEt4) using capillary gas chromatography coupled to inductively coupled plasma-multicollector mass spectrometry

Eva Maria Krupp, C Pecheyran, H Pinaly, M Motelica-Heino, D Koller, S M M Young, I B Brenner, O F X Donard

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Abstract

Precision and accuracy of lead isotope ratios of a volatile lead species (PbEt4) were determined by coupling a capillary GC to a magnetic sector multicollector ICP-MS. PbEt4 was prepared by ethylation of a certified lead isotope solution (NIST SRM 981). Coupling was achieved by a transfer line, which allowed simultaneous introduction of a thallium standard solution to correct for mass discrimination. Seven isotopes (Hg-202, Tl-203, Pb-204, Tl-205, Pb-206, Pb-207, Pb-208) were monitored simultaneously with a transient resolution of 50 ms. Pb isotope ratios for the PbEt4 peaks were calculated using transient peak integrals of each isotope signal. Absolute detection limits were 20 (Pb-204), 0.7 (Pb-206), 1 (Pb-207) and 0.3 pg (Pb-208). Precision was assessed for five replicate injections of PbEt4 in iso-octane, corresponding to a total amount of 300 pg of Pb. Precision of isotope ratios for Pb-206, Pb-207 and Pb-208 were better than 0.07% (RSD), with ratios including Pb-204 being one order of magnitude worse. Accuracy using mass bias correction via Tl-203/(TI)-T-205 ranged from 0.18% for Pb-208/Pb-206 to 0.9% for Pb-208/Pb-204. (C) 2001 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1233-1240
Number of pages8
JournalSpectrochimica Acta. Part B: Atomic Spectroscopy
Volume56
Issue number7
Publication statusPublished - 31 Jul 2001

Keywords

  • gas chromatography/inductively coupled plasma-multicollector mass spectrometry (GC/ICP-MCMS) coupling
  • speciation
  • isotope ratio determination
  • lead
  • COLLECTOR ICP-MS
  • SPECIATION ANALYSIS
  • RATIO MEASUREMENTS
  • TRACE-METAL
  • PB
  • SEDIMENTS
  • DILUTION
  • SAMPLES

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