Some observations on an indirect atomic absorption spectrophotometric method for the microdetermination of chlorine or bromine in organic compounds

Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples

“…Among the various forms of chlorine, total residual chlorine, which is the free residual chlorine plus the combined residual chlorine, is of paramount importance. Methods having different efficiency and convenience have been developed for the determination of chlorine in aqueous samples, which include electroanalytical [5][6][7], chromatographic [8] and optical methods [9][10][11][12][13][14][15][16][17][18][19][20][21]. Among optical methods simple visible spectrophotometric methods take precedence over chemiluminescence and UV-methods because of the complexity involved in the chemiluminescence procedures and lack of selectivity of UV-methods.…”