Ozonation can improve the odor and taste of drinking water effectively, remove coloration, oxidize ferrous and manganous ions, and mainly destroy microorganisms. Thus, it appears as a promising alternative disinfection method for drinking water. Ozone, however, also oxidizes bromide (Br–) to bromate (BrO3 ). The latter has been considered as a potential carcinogen and has been classified in Group 2B by the International Agency of Research on Cancer (IARC). The impact of bromate on human health has resulted in the appearance of several publications during the last decade dealing with the analytical methods of bromate determination in potable waters and possible interferences.
The commonly used method for bromate determination is ion chromatography (IC), which has been standardized and considered as a reference method. Due to certain difficulties involved with the IC method, a simpler and cheaper spectrophotometric BrO3– determination method was sought and proposed. The proposed method employs chlorpromazine (CLP) as color-producing reagent and seems to be an interesting and attractive alternative. The use of this spectrophotometric method for bromate determination gives accurate and precise results that are similar to those obtained by the well established chromatographic method. An additional advantage of this method is being simple, rapid, low cost, and suitable for brackish water.