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Issue 9, 2012
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A fit-for purpose procedure for lead isotopic ratio determination in crude oil, asphaltene and kerogen samples by MC-ICPMS

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Abstract

Lead isotopic ratios have been used extensively in geological, geochronological, and archaeological studies. However, the classical anion exchange method for Pb isolation/purification using AG1-X8 resin cannot be directly adopted for high content organic samples such as crude oils, due to the fact that the sample matrices probably interact with the active sites in the resin. This results in low percentages of Pb being recovered during column separation and low-level sample purity, therefore affecting the precision of the MC-ICPMS isotopic ratio. For Pb isolation/purification from crude oil samples, at least 0.5 mL of the resin AG1-X8 is required to obtain high Pb recovery without fractioning during the analysis of crude oil. After evaluation of 5 different mass bias correction methods, the combination of Tl normalisation (exponential law) and standard bracketing was selected, providing a precision of 0.0039, 0.0014 and 0.0012 and accuracies (‰) of 0.001, 0.001 and 0.004 for 208/204Pb, 207/204Pb and 206/204Pb isotope ratios, respectively, in the analysis of a solution of 10 ng mL−1 SRM NIST 981 (n = 18). The proposed procedure allows the reliable determination of Pb isotope ratio in crude oil, asphaltene and kerogen samples, important in geochronological studies.

Graphical abstract: A fit-for purpose procedure for lead isotopic ratio determination in crude oil, asphaltene and kerogen samples by MC-ICPMS

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Article information


Submitted
08 May 2012
Accepted
15 Jun 2012
First published
15 Jun 2012

J. Anal. At. Spectrom., 2012,27, 1447-1456
Article type
Paper

A fit-for purpose procedure for lead isotopic ratio determination in crude oil, asphaltene and kerogen samples by MC-ICPMS

G. S. Ortega, C. Pécheyran, S. Bérail and O. F. X. Donard, J. Anal. At. Spectrom., 2012, 27, 1447
DOI: 10.1039/C2JA30143A

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