EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8018.13-K-IO Xanthone, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 90-47-1 Price on request AC-AQ03-030 Aqueous ethanol control EtOH AQ (0.3g/L), 10 x 3.0ml Price on request 674783 Ziram, 250mg Price on request