EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2835.7-50-ME 7H-Perfluoroheptanoic acid, 50µg/ml in MeOH, 1ml Price on request 673392 Monolinuron, 10.0 µg/ml, Acetonitrile, 10ml Price on request 0057.18-10MG Benzo[c]phenanthrene[5,6]quinone, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 734-41-8 Price on request