AA Standard #1 Back Catalog number: 59227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3967.19-K-IO Diphenyltolylphosphate, 1000µg/ml in IO, 1ml Price on request 680427 2H,2H-Perfluorooctanoic acid, 10mg Price on request 50677 Butyric acid (C4H8O2) Price on request