Method 1640Mix A Back Catalog number: 53146 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2125.12-100-IOX5 Arochlor 1221 , 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-5, Cas.no. 11104-28-2 Price on request 30057 EPA Method 552 Surrogate Standard Methyl Ester Price on request 72224 Oxacillin Price on request