ASTM D7892-2025 is a standardised method for determining volatile impurities in hydrogen fuel using thermal desorption–GC–MS. It enables sub-ppb detection of total organic halides (TOX), total non-methane hydrocarbons (TNMHC), and formaldehyde – supporting cryogen-free analysis for more sustainable and scalable hydrogen testing, particularly for proton exchange membrane fuel cells (PEMFCs).
The method enables trace-level detection (down to 0.25 ppb(v)) of three key groups of impurities:
- • Total Organic Halides (TOX) – e.g. chloromethane, trichloroethene, vinyl chloride
- • Total Non-Methane Hydrocarbons (TNMHC) – e.g. benzene, hexane, 1,3-butadiene
- • Formaldehyde
TD–GC–MS has been demonstrated to achieve these detection limits across all target compounds.