- Sample Matrix: emissions from stationary sources
- Sample Preparation: collection in passivated stainless-steel canisters
- Detection Technique: GC-MS
Other Test Method 50 (OTM-50): Sampling and Analysis of Volatile Fluorinated Compounds from Stationary Sources Using Passivated Stainless-Steel Canisters
U.S. EPA Method OTM-50 is a performance-based draft method that can be used for the analysis of 30 volatile fluorinated compounds (VFC) in air emissions from stationary sources. It includes multiple short-chain VFC, which may be monitored as indicators of incomplete PFAS decomposition. Emission samples are collected in passivated stainless-steel canisters and then analyzed by GC-MS using a PLOT column. Draft Method OTM-50 was released to encourage a consistent process for facilities, stationary source test teams, research laboratories, and other stakeholders and to promote discussion and further evaluation of the method. The full analyte list and recommended products for collecting volatile fluorinated compounds in emissions for analysis by Method OTM-50 are provided below.
Analyte List for EPA Method OTM-50 for Volatile Fluorinated Compounds in Emissions
| Compound Name | CAS# |
| Carbon tetrafluoride | 75-73-0 |
| Hexafluoroethane (FC-116) | 76-16-4 |
| Tetrafluoroethene | 116-14-3 |
| Trifluoromethane (HFC-23) | 75-46-7 |
| Octafluoropropane | 76-19-7 |
| Difluoromethane (HFC-32) | 75-10-5 |
| Fluoromethane (HFC-41) | 593-53-3 |
| Pentafluoroethane (HFC-125) | 354-33-6 |
| Hexafluoropropene | 116-15-4 |
| Hexafluoropropene oxide (HFPO) | 428-59-1 |
| Decafluorobutane | 355-25-9 |
| Dodecafluoropentane | 678-26-2 |
| Tetradecafluorohexane | 355-42-0 |
| 1H-Perfluoropentane | 375-61-1 |
| Hexadecafluoroheptane | 335-57-9 |
| Heptafluoropropyl-1,2,2,2-tetrafluoroethyl ether (E1) | 3330-15-2 |
| 1H-Perfluorohexane | 355-37-3 |
| 1H-Perfluoroheptane | 375-83-7 |
| 2H-Perfluoro-5-methyl-3,6-dioxanonane (E2) | 3330-14-1 |
| 1H-Perfluorooctane | 335-65-9 |
| Octadecafluorooctane | 307-34-6 |
| 1H-Nonafluorobutane | 375-17-7 |
| 1H-Heptafluoropropane | 2252-84-8 |
| 1,1,1,2-Tetrafluoroethane (HFC-134a) | 811-97-2 |
| 1,1,1-Trifluoroethane (HFC-143a) | 420-46-2 |
| Chlorodifluoromethane (HCFC-22) | 75-45-6 |
| Chlorotrifluoromethane (CFC-13) | 75-72-9 |
| Octafluorocyclobutane (FC-C318) | 115-25-3 |
| Octafluorocyclopentene (FC-C1418) | 559-40-0 |
| Trichloromonofluoromethane (CFC-11) | 75-69-4 |
Recommended Products for EPA Method OTM-50 for Volatile Fluorinated Compounds in Emissions
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