EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11327.15-K-ME Oxcarbazepine,1000 µg/mL,MeOH,1mL, Price on request 3520.10-100-CY Trichloronate Price on request 9754.17-100-IO n-Butyl n-pentyl phthalate, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 3461-29-8 Price on request