EPA Method 508 - Performance Check Solution Back Catalog number: 19132 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1570.34-25MG Pseudomorphine (free base), neat, Solvent-neat, Unit 25mg, # of units-1, Cas.no. 125-24-6 Price on request 673063 Chlortetracycline hydrochloride, 250mg Price on request 679785 Coumatetralyl, 100 µg/ml, Acetonitrile, 1ml Price on request