EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MDF-123469-1 1,2,3,4,6,9-Hexachloro[13C12]dibenzofuran, 1.2ml x 1ug/ml, nonane Price on request 679522 13C6-Sulfamethazine, 10mg Price on request 681665 2,4,5-T-2-ethylhexyl ester, 250mg Price on request