EPA Method 551.1 Surrogate Standard Back Catalog number: 31102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94987 Organonitrogen Pesticides Price on request 673562 beta-Endosulfan, 100 µg/ml, Ethyl acetate, 5ml Price on request 11278.12-100-AN Pyrimethanil-d5 (phenyl-d5),100 µg/mL,acetonitrile,1mL, Price on request