EPA GRO Mix is a multi-component gasoline range organics (GRO) standard containing certified reference materials (CRMs) such as benzene, ethylbenzene, heptane, 2-methylpentane, toluene, 1,2,4-trimethylbenzene, 2,2,4-trimethylpentane, o-xylene, and m-xylene. The GRO-like methods are used to quantify volatile analytes and require purge and trap or direct injection.
