EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8941.10-100MG Coniferaldehyde, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 458-36-6 Price on request 97478 1,4-Butanediol Price on request 70306 m-Xylene, 1000µg/ml in MeOH, 1ml Price on request