EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended X9025 gamma-BHC Price on request 677117 Quercitrin, 10mg Price on request XA10042000AL Aclonifen, 100µg/mL in Acetonitrile, 1ml Price on request