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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.


(ASTM)

Method Data
Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in method.
Preservatives:   None
Required Preps:   Dependent upon collection method: Tedlar bag, Summa can.
Collection Method:   Various methods can be used for collection. Tedlar bags are the most common. Summa cans are also acceptable.
Analytical Methodology:   GC-TCD (thermal conductivity detector)
Documentation:  


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Analyte List*
Analyte
Formula
CAS Number
Detection Limit
Carbon dioxide
CO2
124-38-9
10000
 ppm
Hydrogen
H2
1333-74-0
10000
 ppm
Carbon monoxide
CO
630-08-0
10000
 ppm
Methane
CH4
74-82-8
10000
 ppm
Ethane
C2H6
74-84-0
10000
 ppm
Ethylene
C2H4
74-85-1
10000
 ppm
Nitrogen
N2
7727-37-9
10000
 ppm
Oxygen
O2
7782-44-7
10000
 ppm

* 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.