EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 98403 IP 391-95 Calibration Level 3 Price on request 9382.17-1G Alprazolam, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 28981-97-7 Price on request 0216.26-200-T Dibenzo[g,p]chrysene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 191-68-4 Price on request