EPA Method 8121 Surrogate Standard Back Catalog number: 81204 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 685002 3,3'-Thiodipropionic acid didodecyl ester, 250mg Price on request MET-11043E-10MG Alachlor OA, 10mg Price on request A786992 L-Ascorbic Acid-13C6, 1mg Price on request