EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 63112B PCB 112, 1000µg/ml in Isooctane, 10ml Price on request 53035 Calibration Standard Mix 3 Price on request 681711 2-(2-Chlorophenoxy)propionic acid, 100mg Price on request