ZHOU, Yun Shen; LU, Yao; WANG, Meng Meng; LIU, Lei; HUANG, Xi; JIANG, Li Jia; JIANG, Lan; SILVAIN, Jean-François; LU, Yong Feng

doi:10.1039/C7JA00142H

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ZHOU, Yun Shen
Department of Electrical and Computer Engineering

LU, Yao
Department of Electrical and Computer Engineering

WANG, Meng Meng
Department of Electrical and Computer Engineering

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Journal of Analytical Atomic Spectrometry. 2017, vol. 32, n° 10, p. 1932-1937

Royal Society of Chemistry

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Isotope signatures have attracted growing interest in recent years. In addition to the existing mass spectrometric (MS) techniques, demand for open-air and in situ analytical tools is increasing. Laser ablation is effective in atomizing and ionizing materials, and is frequently used in MS. However, light-isotope enrichment in laser-ablated plasma plumes has to be mitigated for accurate isotope analyses. In this letter, we reported an open-air laser-ablation mass spectrometric (OA-LAMS) technique to measure isotope signatures of Pb and U samples without sample pretreatments with improved accuracy in open air. The secondary cations, PbOH+ and UO2OH+, yielded more accurate isotope signatures regardless of environmental changes. This phenomenon was ascribed to different ionization schemes, in which the primary cations came from laser ionization of the samples and the secondary cations came from chemical ionization of the ablated neutral clusters. The results demonstrated the feasibility of the OA-LAMS method for characterizing isotope signatures.< Réduire

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Isotope signature characterization of Pb and U in open air by laser-ablation mass spectrometry

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