Custom Standard Back Catalog number: 50311 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1773.12-100-AN 4,4'-Diaminobiphenyl,100 µg/mL,acetonitrile,1mL, Price on request 93188 EPA Method 528 Internal Standard Price on request 52063 LFS Solution Kit Price on request