EPA Method 551Mix “A” Back Catalog number: 30194 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681587 13C4-Fipronil, 100 µg/ml, Acetonitrile, 1ml Price on request 673734 Atrazine, 10.0 µg/ml, Ethyl acetate, 10ml Price on request 677608 1H,1H,2H,2H-Perfluorohexanesulfonic acid, 10mg Price on request