In the present method a new,simple and rapid spectophotometric FI technique for the accurate and determination of Cd(Ⅱ) in waste water has been developed.The method is based on the decrease of absorbance intensity of iodide-butylrhodamine B(BRB+) due to the complexation with Cd(Ⅱ),which is found useful for sensitivity in arabin and OP-emulsion media.The absorption peak of the complexation,which is increased linearly by addition of Cd(Ⅱ),occurs at 608nm.Optimization of chemical and FI variables has been made. Under the optimized conditions,the calibration curve obtained were linear over the range 5μg/L^160μg/L,the detection limit was 2μg/L,and the precision(RSD=0.65%,n=10) was found quite satisfactory.Application of the method to the analysis of Cd(Ⅱ) in tap water,steam water added and waste water resulted a good agreement between the expected and found values.
