Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1931.6-1MLX10 Pentafluoropropionic anhydride, neat, Solvent-neat, Unit 1mL, # of units-10, Cas.no. 356-42-3 Price on request EPA-23CS3 Calibration Verification Solution, 1ml, nonane Price on request 3507.10-100-AN Terbutryne, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 886-50-0 Price on request