TM96-08 Implementation of EPA Method 1664 for the Analysis of Oil and Grease or Total Petroleum Hydrocarbons in water

The National Water Quality Laboratory (NWQL) is changing the method used to analyze oil and grease in water samples. This method can also be used to determine Total Petroleum Hydrocarbons (TPH) in water samples. We will be implementing U.S. Environmental Protection Agency (EPA) proposed method 1664 "n-hexane Extractable Material (HEM) and Silica Gel Treated n-hexane Extractable Material (SGT-HEM) by Extraction and Gravimetry." HEM is commonly called "oil and grease" and SGT-HEM is commonly called "Total Petroleum Hydrocarbons."