ResourceEnvironmental
EPA Method 1664: Accurate HEM analysis using C18 SPE cartridges
4 Aug 2025This 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.
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Environmental Monitoring and TestingEnvironmental monitoring and testing uses handheld portable analyzers, kits, spectrometers or chromatography systems for air, water, soil, food and other sample testing. Useful features of analyzers such as BOD and COD include portability, easy calibration, automation and sensitivity. Environmental test kits for pH, water, moisture, etc, should be accurate, sensitive, reliable, fast and easy to use.Water AnalysisAnalytical methods used to test the purity of drinking water include determining the level of contaminants abides to the level set by the Environmental Protection Agency (EPA).Oil and Grease