EPA Method 515.2 Underivatized Back Catalog number: 30073 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70367 3,3’-Dimethylbenzidine Price on request 8868.8-K-IO 5,6,7,8-Tetrahydroquinoxaline, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. Price on request 52309 Ammonium Nitrate Modifier Price on request