EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94587 PCB Congeners 1000 ppb Price on request 70564 Acarol [Bromopropylate] Price on request DPE-28 2,4,4'-Trichlorodiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request