EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 72887 Tri-n-propyltin chloride Price on request 681986 Pethoxamid, 100 µg/ml, Acetonitrile, 5ml Price on request 73200 Pyridaben Price on request