EPA Method 500 Series Internal Std #4 Back Catalog number: 30003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0785.18-500-IO 1,2,6,9-Tetramethylphenanthrene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 204256-39-3 Price on request 98448 Ochratoxin A (from Petromyces albertensis) Price on request 682003 2,5-Dichlorohydroquinone, 50mg Price on request