The Oil and Grease Disk was specifically designed for EPA Method 1664 (N-Hexane Extractable Materials (HEM) and Silica Gel Treated N-Hexane Extractable Material (SGT-HEM) by Extraction and Gravimetry). EPA Method 1664 Revision A was approved for use in the United States and published in the Federal Register on May 14, 1999.
The Oil and Grease Disk incorporates C18 sorbent particles within a hydrophobic matrix. For EPA Method 1664, C18 extractable materials are collected from waste water. These materials are eluted from the disk using hexane. Click here for more information about the C18 sorbent properties.