Comment on: ‘A simple cryogenic method for efficient measurement of triple oxygen isotopes in silicates’ by Ghoshmaulik et al. (Rapid Commun Mass Spectrom. 2020;34(18):e8833)

In a recent article in this journal, Ghoshmaulik et al1 described technical modifications to a long-established laser-assisted fluorination procedure for extracting and purifying molecular oxygen from silicates, prior to triple-isotope ratio analysis. Although the reported respective measurement precisions for δ17O and δ18O values, at 0.040‰ and 0.080‰, are identical to those reported more than 20 years ago,2 using a similar (but not identical)...