EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-23469-S 2,3,4,6,9-Pentachlorodibenzofuran (or 1,4,6,7,8), 1.2ml x 50ug/ml, nonane Price on request 1024.18-2K-T Chrysene-d12, 2000µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 1719-03-5 Price on request 676606 D4-1,2-Dichloroethane, 100mg Price on request