Determination of Chromium(CrⅢ) in Drinking Water by Potassium bromide-Luminol-H2O2 Chemiluminescence System with Flow InjectionAbstract:Determination of Chromium(CrⅢ) in Drinking Water by Potassium bromide-Luminol-H2O2 Chemiluminescence System with Flow InjectionAbstract: Based on the obvious sensitization of potassium bromide on the chemiluminescent reaction in the system of luminol-H2O2–chromium(CrⅢ),a sensitive chemiluminescent method for determination of CrⅢ with flow injection technique was developed.The method is simple,rapid and effective to determine CrⅢ with the range of(1×10-6~1×10-3) mg/ mL and detection limit of 2.06 ×10-7 mg/ mL.The relative standard deviation(RSD) is 2.39% for the determination of 2.0 ×10-6 mg/mL of Cr(Ⅲ)(n=11).Ethylenediaminetetra acetic acid disodium salt(EDTA-2Na) is effectively eliminated the interference of some metal ions such as Fe2+,Fe3+,Cu2+,Zn2+.Therefore,it is a rapid method for determination of CrⅢ sudden changes in drinking water and a good monitor in giving an early alarm in the emergency contamination by heavy metals.The recoverie of CrⅢ was 91.7%~97.5%.