EPA Method 552.2 - Surrogate Standard Back Catalog number: 30108 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2939.12-100-IO Diquat dibromide-d4, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 6385-62-2 Price on request 70367 3,3’-Dimethylbenzidine Price on request 8776.13-100MG Phenyl 4-hydroxybenzoate, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 17696-62-7 Price on request