Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92580 Herbicide Acid Standard Price on request Y0000384 All-rac-alpha-tocopheryl acetate for peak id.,30mg Price on request 79249 EPA Method 8330 Analyte Price on request