EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 54001 Cations Single Component Kit Price on request 681504 D8-Benzidine, 10mg Price on request 681181 Pyrimidifen, 100 µg/ml, Acetonitrile, 1ml Price on request