TOC Calibration Standard Back Catalog number: 59553 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2193.8-50-ME Perfluorooctane sulfonic acid, potassium salt,50 µg/mL,MeOH,1mL, Price on request 97717 Carbon disulphide Price on request 92710 Acetophenone & Benzophenone Price on request