Trace CO and CO2 in Hydrogen and Light Gaseous Hydrocarbons by GC

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    1. Scope

    This method is for determining low concentrations (0.5 to 500 mol-ppm) of carbon monoxide (CO) and carbon dioxide (CO2) in high purity hydrogen and other gas-phase samples. The lower limit of detection for either CO or CO2 in hydrogen is 0.5 mol-ppm. The lower limit of detection for CO in samples containing high concentrations of oxygen, argon or nitrogen is 5 mol-ppm. Methane at concentrations above 5 mol-% will interfere with the determination of carbon dioxide.

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