EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 98645 California Gas Additive Standard Price on request 93389 Pentachlorophenol, 5000µg/ml in MeOH, 1ml Price on request 3796.18-K-IO Tonalide, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 21145-77-7 Price on request