EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676862 D6-Parathion-methyl, 100 µg/ml, Acetone, 1ml Price on request 685532 S421, 100 µg/ml, Acetonitrile, 5ml Price on request 677476 Bisphenol A, 100 µg/ml, Acetone, 1ml Price on request