A new method based on the relationship of the enhanced intensity of resonance light-scattering to the concentration of Cr（Ⅵ） in water sample was developed. The spectral characteristics of Cr（ Ⅵ）- KI-janus green B in phosphoric acid medium was studied under the optimal conditions. This method could be operated conveniently at room temperature with high sensitivity and good selectivity . The detection limit and linear range for Cr（Ⅵ） were 2.00μg/L and 0. 01～0. 2 mg/L,respectively. The proposed method has been used to determine Cr（Ⅵ）...
