This method is designed to determine the chemical composition of natural gases and similar gaseous mixtures by GC-FID (flame ionization 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 along with C1-C6 hydrocarbons Typical detection limits are 1ppm.
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 D1946 (chemical composition of reformed gas) also referred to as a fixed gas method.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in method. |
| Preservatives: | None specified in method. |
| Required Preps: | Dependent upon collection method: Tedlar bag or 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-FID (flame ionization detector) |
| Documentation: | |
| SKU | Item | Price | |
|---|---|---|---|
| TB | Sampling Bags: Air Sampling Bags | $ Call for Price | |
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Butane | C4H10 |
106-97-8 |
1 |
ppm |
| Pentane | C5H12 |
109-66-0 |
1 |
ppm |
| Hexane | C6H14 |
110-54-3 |
1 |
ppm |
| Carbon dioxide | CO2 |
124-38-9 |
1 |
ppm |
| Hydrogen | H2 |
1333-74-0 |
1 |
ppm |
| Carbon monoxide | CO |
630-08-0 |
1 |
ppm |
| Helium | He |
7440-59-7 |
1 |
ppm |
| Methane | CH4 |
74-82-8 |
1 |
ppm |
| Ethane | C2H6 |
74-84-0 |
1 |
ppm |
| Ethylene | C2H4 |
74-85-1 |
1 |
ppm |
| Propane | C3H8 |
74-98-6 |
1 |
ppm |
| Isobutane | C4H10 |
75-28-5 |
1 |
ppm |
| Nitrogen | N2 |
7727-37-9 |
1 |
ppm |
| Oxygen | O2 |
7782-44-7 |
1 |
ppm |
| Isopentane (2-methylbutane) | C5H12 |
78-78-4 |
1 |
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.