EPA Method 8121 Internal Standard Back Catalog number: 81203 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79783 Acetamiprid, 1000µg/mL in acetonitrile, 1ml Price on request 9865.17 alpha-Hydroxyalprazolam , , Solvent-, Unit , # of units-, Cas.no. 37115-43-8 Price on request 1357.10-1G 4-n-Butylphenol, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 1638-22-8 Price on request