EPA 1638Mix A Back Catalog number: 53144 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9497.13-100-ME Propyphenazone, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 479-92-5 Price on request C14582000 Lactic acid, 100mg Price on request 2750.11-1ML n-Valerophenone, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 1009-14-9 Price on request