Total Residual Free Chlorine (Cl) Back Catalog number: 59427 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 27013 EPA Method 8260B - Purgeable Internal Std Price on request 1688.0-2K-T Hydrogensulfide, 2000µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 7783-06-4 Price on request 675779 Phoxim, 100 µg/ml, Ethyl acetate, 5ml Price on request