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Impurities in Hydrogen

APPLICATION # 210

 

The Analysis

This GC is designed to analyze impurities such as nitrogen, methane, carbon monoxide, carbon dioxide, and methane in pure hydrogen.

 

How It Works

A sample injection is made simultaneously into a molecular sieve column, Figure 1, and a porous polymer column, Figure 2. At approximately 7 minutes, the nitrogen, methane, and carbon monoxide will have been analyzed by the TCD detector. The carbon monoxide, methane, and carbon dioxide are separated in the porous polymer column and are detected by an FID in combination with a methanizer. Two separate chromatograms are obtained, but only one report is compiled by the data system; the final report showing all components analyzed is shown in Figure 3.

 
The minimum detectable limits of carbon dioxide (CO2) are approximately 50 ppb.

 Primary Channel 1A           Secondary Channel 1B

Peak              Time      Result           Area          Result             Area

Name             (Min)      (PPM)           Counts      (PPM)             Counts

 

CO                 0.933         9789.975              164993

C1                 1.128          14979.70             241740

CO2               2.356         2204.847               34541

Nitrogen         2.881        1062.0457             207463

Methane         4.538      15019.4053            2290220

CO                7.193        9819.8828            1802622

 

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