Total Residual Free Chlorine (Cl) Back Catalog number: 54224 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2671.5-50-IP Dibromoneopentylglycol, 50µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 3296-90-0 Price on request 675193 D6-Dimethoate, 100 µg/ml, Acetone, 1ml Price on request 675029 Sodium 4-n-octylbenzenesulfonate, 100 µg/ml, Meth Price on request