EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676313 Prometryn, 10.0 µg/ml, Acetonitrile, 10ml Price on request 678380 4,4'-DDE, 100 µg/ml, Acetonitrile, 5ml Price on request 95267 Propazine Price on request