USEPA Method 25 Non-Methane Organic Compounds

The Non-Methane Organic Carbon (NMOC) Analyzer is a gas chromatograph configured for analyzing gaseous samples for total organic carbon content, detected as methane. The system is designed to determine concentrations of methane, carbon dioxide, carbon monoxide, ethane/ethene, and all organics from propane and heavier as a single peak. Additional hardware is configured to measure fixed gases (including oxygen, nitrogen, hydrogen, carbon monoxide, and methane). The methodology employed in this analyzer meets the requirements of both EPA Method 25 and South Coast Air Quality Management District (SCAQMD) Method 25.3.