EPA Method 8032 Internal Standard Back Catalog number: 80303 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9223.5-100MG Allopurinol, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 315-30-0 Price on request 675397 Chlorpyrifos, 100 µg/ml, Acetonitrile, 5ml Price on request 3656.6-100MG 1,2,4,5-Tetrachlorobenzene, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 95-94-3 Price on request