Hydrogen is used in a number of areas, from industrial processes such as pesticide production and the removal of sulfur from petrochemical products to its use as a fuel and in power generation. To ensure the quality of hydrogen, standards such as ISO 14687 and GB/T 3634.2 have been produced which specify the maximum content of certain compounds in hydrogen gas. As such, it is of great importance that hydrogen gas refiners and those using hydrogen gas in various processes have access to a method which allows for quick, accurate and sensitive detection of these compounds. This application note shows the quantitation of carbon monoxide (CO), carbon dioxide (CO2) and methane (CH4) in hydrogen. The analysis is performed with a modified configuration to allow for the determination of total hydrocarbon content (THC) or the determination of non-Methane Hydrocarbons (NMHC or C2+).