Method 200.8/1638/1640 Internal Standard Back Catalog number: 53145 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71949 1-Butanethiol Price on request 59346 Anions Mix - Chloride + Sulfate as SO42- Price on request 8115.9-100-AN 2-[2,4-Dinitrophenylhydrazone]pyruvaldehyde, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 29903-80-8 Price on request