EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 32391 1,1,1,2-Tetrachloroethane Price on request 685660 Bentazone-methyl, 100µg/ml in Acetonitrile, 5ml Price on request 681352 Quinclorac-methyl, 100mg Price on request