Abstract
A simple variation in sample preparation and introduction allows the measurement of chlorine isotope ratios by inductively coupled plasma mass spectrometry (ICP/MS). Dissolution of the sample in D2O rather than H2O attenuates the major polyatomic ion 36ArH+ and frees m/z 37 for determination of 37Cl+. The isotope ratio 35Cl/37Cl in a 50 mg/L solution of Cl as LiCl is determined with a relative standard deviation of 0.21%. Sample memory is low, as the 35Cl signal decays to less than 1% of its original value after ∼2 min of cleanout with D2O . The detection limit for Cl using this procedure is approximately 20 μg/L.
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Smith, F.G., Houk, R.S. Alleviation of polyatomic ion interferences for determination of chlorine isotope ratios by inductively coupled plasma mass spectrometry. J Am Soc Spectrom 1, 284–287 (1990). https://doi.org/10.1016/1044-0305(90)85002-4
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DOI: https://doi.org/10.1016/1044-0305(90)85002-4