EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677904 Edifenphos, 10 µg/ml, Acetonitrile, 10ml Price on request 677091 Ketotriclabendazole, 10mg Price on request 677441 Spirotetramat-enol-glucoside, 100 µg/ml, Acetonit Price on request