EPA Method 509 Internal Standard Back Catalog number: 30097 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 685008 Dehydroacetic acid sodium salt, 250mg Price on request 34054 EPA Method 552.1 - Haloacetic Acids Price on request 673696 S421, 100 µg/ml, Ethyl acetate, 5ml Price on request