pH 4.0 Standard @ 25°C Back Catalog number: 59468 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91965 MA - VPH Matrix Spiking Sub Price on request 19000-0451-50AN5 N-(1,3-Dimethylbutyl)-N´-phenyl-1,4-phenylenediamine, 50µg/ml in Acetonitrile, 5ml Price on request 676953 Heptafluorobutyric acid, 100mg Price on request