EPA Method 551 Analytes Back Catalog number: 32095 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675232 Dimethachlor, 100 µg/ml, Acetonitrile, 5ml Price on request 0622.27-K-IO alpha alpha alpha (20R)-Cholestane, 1000µg/mL in Isooctane, 1ml Price on request 678426 Heptachlor, 100 µg/ml, Acetonitrile, 1ml Price on request