EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-23467-S 2,3,4,6,7-Pentachlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request 96954 PAH Standard Price on request ATBCO (1R,2R,5S,6S)-1,2,5,6-Tetrabromocyclooctane, 1.2ml x 50ug/ml , toluene Price on request