Recommendations and Protocols for the Use of the Isotope Ratio Infrared Spectrometer (Delta Ray) to Measure Stable Isotopes from CO<sub>2</sub>: An Application to Volcanic Emissions at Mount Etna and Stromboli (Sicily, Italy)

<div>Comparison between real CO<sub>2</sub> contents and measured diluted ones from Delta Ray IRIS with either the (a) yellow, (b) pink, (c) blue, or (d) gray dilution wires. The two Delta Ray IRIS instruments available at the INGV Palermo (DR1 and DR2) were used for this test leading to distinct coefficients for the equation of linear regression. CO<sub>2</sub> contents of reference gases varying from 1 to 95% (see Appendix <a href="https://static.hindawi.com/articles/geofluids/volume-2020/4598190/figures/#supplementary-material-1">1</a>).</div>

Geofluids

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Figure 7

Figure 7: Recommendations and Protocols for the Use of the Isotope Ratio Infrared Spectrometer (Delta Ray) to Measure Stable Isotopes from CO<sub>2</sub>: An Application to Volcanic Emissions at Mount Etna and Stromboli (Sicily, Italy) 

Figure 7 | Recommendations and Protocols for the Use of the Isotope Ratio Infrared Spectrometer (Delta Ray) to Measure Stable Isotopes from CO2: An Application to Volcanic Emissions at Mount Etna and Stromboli (Sicily, Italy) 