EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3283.21-K-IO Methyl arachidonoate (5c,8c,11c,14c), 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 2566-89-4 Price on request 678119 D10-Chlorpyrifos, 100 µg/ml, Acetonitrile, 5ml Price on request 32852 EPA Method 551 - Disinfection By-Products Price on request