EPA Method 507 - Performance Check Solution Back Catalog number: 19137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C12631000 Diflufenican, 100mg Price on request 94270 Volatile Standard Price on request 673205 Atrazine-desethyl, 100 µg/ml, Acetonitrile, 5ml Price on request