Fast and precise method for Pb isotope ratio determination in complex matrices using GC-MC-ICPMS: Application to crude oil, Kerogen, and asphaltene samples - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Analytical Chemistry Année : 2012

Fast and precise method for Pb isotope ratio determination in complex matrices using GC-MC-ICPMS: Application to crude oil, Kerogen, and asphaltene samples

Résumé

A new method to determine Pb isotope ratio without ion-exchange-matrix separation is proposed. After acid digestion, Pb was ethylated to Et 4Pb, separated from the digested solution (black shale, asphaltene, crude oil and kerogen) by extraction in isooctane, and then injected into a gas chromatograph coupled to a multicollector inductively coupled plasma mass spectrometer. Seven isotopes (202Hg, 203Tl, 204Pb, 205Tl, 206Pb, 207Pb, 208Pb) were monitored simultaneously with peak duration of 23 s. GC elution was operated under wet plasma conditions where a thallium standard solution was introduced to the mass spectrometer for mass bias correction. The total time of the procedure (sample preparation and analysis, after acid digestion) was reduced by a factor of 15 compared to conventional-continuous sample introduction. Data treatment was carried out using the linear regression slope method. Mass bias was corrected using the double correction method (first thallium normalization followed by classical bracketing). For the 208/206Pb and 207/206Pb ratios, precision (2RSD EXT, n = 21) was 49 and 69 ppm, and the bias between experimental results and reference values was better than 0.0033 and 0.0007 %, when injecting 1.2 ng of ethylated Pb SRM NIST 981 solution. Results obtained by this method were validated by comparison with those obtained via conventional-continuous sample introduction. The applicability of this approach was demonstrated with the analysis of black shale, asphaltene, crude oil and kerogen samples. © 2012 American Chemical Society.
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hal-01590295 , version 1 (19-09-2017)

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G. Sanabria-Ortega, Christophe Pécheyran, Sylvain Bérail, Olivier François Xavier Donard. Fast and precise method for Pb isotope ratio determination in complex matrices using GC-MC-ICPMS: Application to crude oil, Kerogen, and asphaltene samples. Analytical Chemistry, 2012, 84 (18), pp.7874-7880. ⟨10.1021/ac301251b⟩. ⟨hal-01590295⟩
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