Dissolved Gas N2/Ar Analysis
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The N2 / Ar bottles are date coded by the first two digits of the bottle number. 21Y**** bottle number is a 2021 bottle. Do not use bottles more than two years old. If you have bottles more than two years old, order new ones to use.
N2, Ar, CO2, CH4, O2 instrument in use by the US Geological Survey
