EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682123 PCB 138, 10.0 µg/ml, Isooctane, 10ml Price on request 90926 bis(2-Ethylhexyl) adipate Price on request 676221 alpha,alpha,alpha-Trifluorotoluene, 250mg Price on request