EPA Method 1664, Revision A describes the determination of oil and grease from liquid (typically water) samples.
EPA Method 1664, Revision A, n-Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel-Treated Hexane Extractable Material (SGT-HEM; Non‑polar Material) by Extraction and Gravimetry, describes the determination of oil and grease from liquid (typically water) samples.