EPA Method 500 Series Internal Std #4 Back Catalog number: 30003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676253 D5-Propachlor ESA sodium salt, 100µg/ml in Acetonitrile, 1ml Price on request 680032 1,3-Bis(4-nitrophenyl)urea, 50mg Price on request 94491 Phenol Mix Price on request