EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8868.8-K-IO 5,6,7,8-Tetrahydroquinoxaline, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. Price on request 10223.14-100MG n-Heptyl 4-hydroxybenzoate, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 1085-12-7 Price on request 38200 RCRA Low Level PAHs Price on request