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CDES Preparation

Making Heated and Equilibrated Gases

This method describes how to make equilibrated and heated gases used to create the carbon dioxide equilibrium scale (CDES) for calibration of our carbonate clumped isotope thermometer. Equilibrated gases are made by putting carbon dioxide (CO2) and water (H2O) into a vessel and allowing them to reside together at specific temperatures for an extended period of time. The types of CO2 and H2O are referred to with two letter codes. The two types of CO2 are FC (Fermented Corn) and FF (Fossil Fuel). The water types are EN (enriched), DI (deionized water from the tap), and SP (south pole). The temperatures we use are 4 °C (refrigerator), 25 °C (lab temperature), and 60 °C (drying oven). The heated gases are created by putting dry CO2 into a sealed quartz tube and heating it to 1000 °C.

CDES prepline diagram

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I have read and understood the present SOP and, before starting work outlined in the present SOP, I will complete all required training.

Last updated: 2025-10-09 15:57:34