EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11216.23-100-IO Trixylyl phosphate, purified ion m/z 396 (pentamethyl),100 µg/mL,isooctane,1mL, Price on request SC-257307A Di-n-butyl phthalate, >99%, 25g Price on request 50149 ICP Mix #3 Price on request