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. 17Y**** bottle number is a 2017 bottle. Do not use bottles more than one year old. If you have bottles more than one year old, request new ones to use.
N2, Ar, CO2, CH4, O2 instrument in use by the US Geological Survey
