EPA Method 8121 Internal Standard Back Catalog number: 81203 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678397 beta-Endosulfan, 100 µg/ml, Acetonitrile, 5ml Price on request 673299 Flufenoxuron, 100 µg/ml, Acetonitrile, 5ml Price on request 95731 Semi-Volatile Mix Price on request