Carbon Dioxide Isotope Analyzer - Elevated CO2 Overview

The stable isotope composition of carbonate minerals has been of interest for decades, with initial research focusing on measurements of carbonates in the ocean for paleoceanography applications. Stable isotope studies of carbonates have also been used extensively to explore the role of fluid-rock reaction and geosphere-hydrosphere-atmosphere interactions in the earth and environmental sciences.  To date, conventional analyses involve acidification of a carbonate sample to produce CO2, followed by measurements with IRMS. While effective, IRMS requires a trained operator, is expensive, and cannot be performed in the field.

LGR’s new “Carbon Dioxide Isotope Analyzer - Elevated CO2“ provides many features that researchers need when measuring isotopic carbon dioxide from samples containing high levels of CO2 including:

• Ultra-low drift and high precision

• Ability to measure CO2 as well as δ13C and δ18O in CO2 from 2% to 100% CO2

• Ability to analyze acidified carbonates

• Ability to analyze breath (human, mice)

• Fast response

The new Analyzer meets all of the needs for effective measurements of isotopic carbon dioxide, including: (1) accurate measurements over a wide range of mole fractions, (2) high precision, (3) ability to report reliable values even if mixing ratios are rapidly changing, (4) portability (low power), (5) user-friendly interface, (6) low drift / high stability.  In addition, the availability of many value-added options extends the abilities of the unit to include discrete samples (collected in bags or vials, for example) and to automatically handle multiple inlet sources.

The Analyzer uses LGR’s patented Off-axis ICOS technology, a fourth-generation cavity enhanced absorption technique. Off-axis ICOS has many advantages over conventional Cavity Ringdown Spectroscopy (CRDS) techniques such as being more robust mechanically and thermally, having a much shorter measurement time, and not requiring expensive and power consuming auxiliary components.  As a result, LGR instruments provide unsurpassed performance, durability and ease of use.