EPA Method 1664: Accurate HEM analysis using C18 SPE cartridges

This application note provides a detailed protocol for EPA Method 1664, which determines hexane extractable material (HEM), commonly referred to as oil and grease, in water samples. Using UCT's ENVIRO-CLEAN^® endcapped C18 cartridges, the procedure outlines sample preparation, cartridge conditioning, extraction, elution, and gravimetric analysis to ensure accurate quantification of HEM content.