EPA Method 551Mix “A” Back Catalog number: 30194 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682911 Allethrin, 100 µg/ml, Acetonitrile, 5ml Price on request M338791-1MG Metoprolol-D7 Hydrochloride, 1mg Price on request 72846 Dimethenamid OA, 1000µg/ml in MeOH, 1ml Price on request