EPA Method 552.1 - Surrogate Standard Back Catalog number: 31057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2204.14-K-IO 9-Nitrophenanthrene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 954-46-1 Price on request 677866 Amidithion, 10mg Price on request 673460 Trichlorfon, 10.0 µg/ml, Acetonitrile, 10ml Price on request