Abstract
The viability of oxygen isotope analysis of tooth enamel by UV laser ablation and fluorination has been demonstrated by comparison with the Ag 3PO 4 extraction method. In-situ analyses by UV laser fluorination using both isotope ratio mass spectrometry and isotope ratio monitoring gas chromatography mass spectrometry (irm-GCMS) microanalysis are comparable to those of the Ag 3PO 4 method with a mean precision of ±0.4‰ (1 σ) for samples with δ 18 O values ranging from 10.8 to 20.8‰. UV laser ablation provides spatial resolution of 100 μm or less with no laser reaction rim. These data show that irm-GCMS offers a combination of spatial and analytical precision for in-situ sampling of biogenic apatites previously unobtainable by other means.
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