EPA Method 508A DCB Stock Solution Back Catalog number: 30020 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71512 Catechol Price on request 679881 4,4'-Diaminodiphenylmethane, 100 µg/ml, Acetonitr Price on request 11931.12-50-AN N-Ethyl-N-(2-hydroxyethyl)perfluorooctylsulphonamide,50 µg/mL,acetonitrile,1mL, Price on request