Spectrophotometric estimation of bromide ion in excess chloride media

The redox reaction between bromate and chloride ions in the presence and the absence of two or less equivalents of bromide ion ascertaining the formation of bromine chloride species of type BrCl and BrCl2− in subsequent reactions in 4% H2SO4, has been studied by spectrophotometry. Calibration graphs for the bromide ion estimation in 0.1% KBrO3-4% H2SO4 medium are determined separately in the presence of known amounts of NaCl. The effect of Cl− ion percentage on the determination of Br− ion is studied and reported herewith a suitable equation for a precise, reliable and quick spectrophotometric estimation.