EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8216.12-K-AN Pivaldehyde-PFOA derivative, 1000µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. Price on request 73463 beta-Cyfluthrin, 10000µg/ml in MeOH, 1ml Price on request 10415.4-K-ME Sodium DL-2-hydroxybutyrate-2,3,3-d3 Price on request