EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 73431 4-Amino-2-chlorophenol Price on request 676340 Tecnazene, 10.0 µg/ml, Cyclohexane, 10ml Price on request 680330 Carbamazepine 10,11-epoxide, 5mg Price on request