Analytical Method Guidance for EPA Method 1664A Implementation and Use (40 CFR part 136).
Get more information about the standard at EPA 1664A.
EPA 1664A
The method EPA 1664A for the determination of oil and grease in water by extraction and gravimetry was replace by EPA 1664B. Additional information on this method can be found there. The standard ASTM D8193 offers a modern alterative for oil in water testing employing IR spectroscopy an eco-friendly solvent.