EPA Method 500 Series Internal Std #4 Back Catalog number: 30003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682090 Crotonic acid, 100mg Price on request 0244.24-10MG Dibenzo[a,e]pyrene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 192-65-4 Price on request 678660 S-Metolachlor Metabolite CGA 368208, 50mg Price on request