Precise determination of 204Pb-based isotopic ratios in environmental samples by quadrupole inductively coupled plasma mass spectrometry

The measurement of 204Pb-based isotopic ratios by quadrupole ICP-MS has been investigated. After multivariate optimization of the main operating conditions (sample uptake rate, spray chamber temperature, quadrupole voltages), the isotopic ratios were measured with an internal precision of ∼0.4% (% R...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 2023-05, Vol.38 (5), p.1057-1064
Main Authors: Grotti, Marco, Maria Alessia Vecchio, Gobbato, Dalia, Mataloni, Matilde, Ardini, Francisco
Format: Article
Language:English
Subjects:
Inductively coupled plasma mass spectrometry
Isotope ratios
Isotopes
Lead isotopes
Mass spectrometry
Optimization
Quadrupoles
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Summary:The measurement of 204Pb-based isotopic ratios by quadrupole ICP-MS has been investigated. After multivariate optimization of the main operating conditions (sample uptake rate, spray chamber temperature, quadrupole voltages), the isotopic ratios were measured with an internal precision of ∼0.4% (% RSD, n = 12) at the Pb concentration of 1 μg L−1 and ∼0.2% at 10 μg L−1, close to the values usually reported for the measurement of major isotopes by quadrupole ICP-MS. The external precision was ∼0.3% (% RSD, n = 35) and the bias, after the correction of the isobaric overlapping of 204Hg on 204Pb, was lower than 2‰. The applicability of the developed method in the environmental field was demonstrated by the analysis of a time series of 84 atmospheric particulate samples collected from the Arctic and characterized by low Pb concentration, obtaining data in good agreement with the isotopic composition of airborne particulate deposited in central Greenland.
ISSN:0267-9477
1364-5544
DOI:10.1039/d2ja00424k