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Determination of lead isotopes in a new Greenland deep ice core at the sub-picogram per gram level by thermal ionization mass spectrometry using an improved decontamination method

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Title
Determination of lead isotopes in a new Greenland deep ice core at the sub-picogram per gram level by thermal ionization mass spectrometry using an improved decontamination method
Authors
Han, Changhee
Burn-Nunes, Laurie J.
Lee, Khanghyun
Chang, Chaewon
Kang, Jung-Ho
Han, Yeongcheol
Hur, Soon Do
Hong, Sungmin
Subject
Chemistry
Keywords
Lead isotopes; Greenland deepicecore; Improved decontamination procedure; Silica-gel activator; TIMS; Thermal ionization mass spectrometry
Issue Date
2015
Citation
Han, Changhee., et al. 2015. Determination of lead isotopes in a new Greenland deep ice core at the sub-picogram per gram level by thermal ionization mass spectrometry using an improved decontamination method. Talanta, 140(2015): 20-28.
Abstract
An improved decontamination method and ultraclean analytical procedures have been developed to minmize Pb contamination of processed glacial ice cores and to achieve reliable determination of Pb isotopes in North Greenland Eemian Ice Drilling (NEEM) deep ice core sections with concentrations at the sub-picogram per gram level. A PL-7 (Fuso Chemical) silica-gel activator has replaced the previously used colloidal silica activator produced by Merck and has been shown to provide sufficiently enhanced ion beam intensity for Pb isotope analysis for a few tens of picograms of Pb. considering the quantities of Pb contained in the NEEM Greenland ice core and a sample weight of 10g used for the analysis, the blank contribution from the sample treatment was observed to be negligible. The decontamination and analysis of the artificial ice cores and selected NEEM Greenland ice core sections confirmed the cleanliness and effectiveness of the overall analytical process.
DOI
10.1016/j.talanta.2015.03.007
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