Method D-1946

Standard Method for Analysis of Reformed Gas by GC (Fixed Gases)

This method is designed to determine the chemical composition of reformed gases and gaseous mixtures by GC-TCD (thermal conductivity detector).  This method is also commonly referred to as the fixed gas method.  H₂, O₂, N₂, CH₄, CO, CO₂, ethane, ethylene, also known as atmospheric gases, can be determined by this method.  Typical detection limits are 1% (10,000 ppm).

Tedlar bags and Summa cans are most commonly used for sample collection.  However, fixed gases are  often determined in ground water samples and leachates from landfills.

This method is closely related to ASTM D1945 (chemical composition of natural gas) also referred to as a fixed gas method.

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.