EPA Method 8240A Internal Standard Back Catalog number: 22003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66137 2,2',3,4,4',5-Hexachlorobiphenyl (137) Price on request 10147.19 6-Acetylmorphine-13C3 (free base), , Solvent-, Unit , # of units-, Cas.no. Price on request 675270 Methidathion, 100mg Price on request