EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended PN-34S 1,2,4,7-Tetrachloronaphthalene, 1.2mL x 50ug/mL, nonane Price on request 677378 D6-Sudan II, 10mg Price on request 0025.16-100-T 3-Nitrofluoranthene, 100µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 892-21-7 Price on request