EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79153 Octachlorostyrene Price on request 10963.17-K-ME Diphenhydramine hydrochloride ,1000 µg base/mL,MeOH,1mL, Price on request XA09010161 Cadusafos, 100µg/ml in Acetonitrile, 1ml Price on request