EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11143.24-K-IO Tris(2,3-dimethylphenyl) phosphate,1000 µg/mL,isooctane,1mL, Price on request 71970 4,4'-Dichlorobenzhydrol Price on request MPN-74 1,2,3,4,5,6,8-Heptachloro(13C10)naphthalene, 1.2mL x 50ug/mL, nonane Price on request