Flow injection determination of trace amounts of iodide with spectrophotometric detection by its catalytic effect on the 4,4 '-bis(dimethylamino)diphenylmethane-chloramine T reaction

A simple and accurate flow injection spectrophotometric procedure was devel oped for the determination of iodide based on its catalytic effect on the o xidation of 4,4'-bis (dimethylamino) diphenylmethane (tetrabase) by Chloram ine T in a weakly acidic solution. The optimum analytical conditions have b een established. The linear range of the detection is 4-110 ng/mL, with a l imit of detection 3 ng/mL. The method has been used to determine iodide tra ces in water.