EPA Method 504 Back Catalog number: 81806 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70541 Azinphos ethyl, 1000µg/ml in MeOH, 1ml Price on request 688495 Terbuthylazine-2-hydroxy, 100µg/ml in Acetone, 1ml Price on request XA16950200AL Simazine D5, 100µg/mL in Acetonitrile, 1ml Price on request