Total Residual Free Chlorine (Cl) Back Catalog number: 54124 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3799.8-100MG 2,3,4,5-Tetramethylthiophene, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 14503-51-6 Price on request 93989 Volatile Standard Price on request 14500-0270-100CY5 2,2´-Binaphthyl, 100µg/ml in Cyclohexane, 5ml Price on request