1.
Anal Chem
; 92(6): 4512-4517, 2020 03 17.
Article
in English
| MEDLINE
| ID: mdl-32083471
ABSTRACT
A compact isotope ratio sensor based on laser absorption spectroscopy at 2.7 µm was developed for high precision and simultaneous measurements of the D/H, 18O/16O and 17O/16O isotope ratios in glacier water. Measurements of the oxygen and hydrogen isotope ratios in glacier water demonstrate a 1σ precision of 0.3 for δ18O, 0.2 for δ17O, and 0.5 for δ2H, respectively. The δ values of the working standard glacier water obtained by the calibrated sensor system is basically identical to the IRMS measurement results with a very high calibration accuracy from 0.17 to 0.75. Preliminary results on the reproducibility measurements display a standard deviation of 0.13 for δ18O, 0.13 for δ17O, and 0.64 for δ2H, respectively.