EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11631.20-10MG (S)-Citalopram oxalate,neat,neat,10mg, Price on request 675240 Mesotrione, 100 µg/ml, Acetonitrile, 5ml Price on request 66070 2,3',4',5-Tetrachlorobiphenyl (70) Price on request