EPA Method 531.1 - Analytes Back Catalog number: 30042R Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 680532 Fenvalerate free acid Metabolite, 100mg Price on request 682020 D4-Estrone, 10mg Price on request 678095 Isofenphos, 100 µg/ml, Acetonitrile, 1ml Price on request