EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70917 4-Aminoazobenzene Price on request 90298 Naphthalene, 2000µg/mL in MeOH, 1ml Price on request 679111 Disulfoton-sulfoxide, 10.0 µg/ml, Cyclohexane, 1 Price on request