EPA Method 551.1 Internal Standard Back Catalog number: 32103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676661 AHTN (Tonalid), 100mg Price on request 673409 Phenthoate, 100 µg/ml, Acetonitrile, 5ml Price on request 680296 1,2,5,6,9,10-Hexabromocyclododecane, 100 µg/ml, C Price on request