Total Residual Free Chlorine (Cl) Back Catalog number: 59427 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71813 1,3-Phenylenediamine, 1000µg/mL in methylene chloride, 1ml Price on request 10900.17-K-DS Promethazine hydrochloride,1000 µg base/mL,DMSO,1mL Price on request 93876 2-Deoxy-D-ribose Price on request