EPA Method 552.1 - Surrogate Standard Back Catalog number: 31057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677916 Mefenacet, 10 µg/ml, Acetonitrile, 10ml Price on request R641000 Ropinirole Hydrochloride, 25mg Price on request DF-1234689-S 1,2,3,4,6,8,9-Heptachlorodibenzofuran, 1.2ml x 50ug/ml, toluene Price on request