EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10983.10-K-ME 5-Hydroxyindole-3-acetic-2,2-d2 acid, 1000µg/ml in Price on request 18000-0282-100AN5 Clotrimazole, 100µg/ml in Acetonitrile, 5ml Price on request CA15987120 Perfluorooctane sulfonic acid, 25mg Price on request