This method is for determining individual trace C5 minushydrocarbon impurities in hydrogen or liquefied petroleum gas(LPG), where the specific trace components are sufficientlyresolved from the major components, typically propane/propylene orethane/ethylene. Components eluting after ethyl acetylene aregrouped and reported as heavies. The range of quantitation for eachcomponent is 2 to 3000 mol-ppm; however, the lower limit ofquantitation increases when major components interfere with theresolution of the impurities.