EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended CFN97218 p-Coumaric acid ethyl ester, >98%, 20mg Price on request 674813 Bifenox, 100 µg/ml, Acetonitrile, 5ml Price on request 1459.14-200-T 2-Nitroanthracene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 3586-69-4 Price on request