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.
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N2, Ar, CO2, CH4, O2 instrument in use by the US Geological Survey