Direct Determination of δ(D) and δ(18O) in Water Samples Using Cavity Ring Down Spectrometry: Application to bottled mineral water
Journal of Geochemical Exploration http://dx.doi.org/10.1016/j.gexplo.2012.05.007
The repeatability, reproducibility and accuracy of the direct measurement of δ(D) and δ(18O) isotopes inwater samples were evaluated using Cavity Ring-Down Spectrometry, and values comparable with the Isotopic Ratio Mass Spectrometry were obtained. Memory effect correction was negligible after ﬁve successive injections, and the time for each sample analysis was approximately 70 minutes. Application of the method toBrazilian bottled mineral water has shown that it is possible to trace the origin of the water to at least thestate level within Brazilian geographical regions. National and regional meteoric water lines were constructed with substantial differences between geographical regions, in particular for the central region ofthe country, with a slope coefﬁcient of approximately seven and no deuterium excess.