在盐酸介质条件下，I－被亚氯酸根氧化成I2，I2再与过量的I－形成阴离子I3－。体系中带正电荷的吖啶橙（AO）与I3－在静电力的作用下形成缔合物微粒，导致体系的共振散射强度增强，据此建立了一种用共振散射光谱法测定水中亚氯酸根的新方法。研究了碘化钾和AO用量等因素对体系的影响，优化了实验条件。在最佳实验条件下，亚氯酸根质量浓度在7．18×10－4~0．114 mg/L范围内与ΔIRS呈良好的线性关系。该方法的线性方程为ΔIRS=870．39ρ+9．2739，相关系数（R2）为0．9927，检出限（3σ）为1．8×10－4 mg/L。%In the presence of hydrochloride medium,I-has been oxidized by chlorite, forming I2,Then it is combined with excessive I-,forming anion I3-. In the system,mixing positive charged acridine orange (AO) with I3-forms an association fine particle under the action of electrostatic force ,and results in the enhancement of resonance scattering intensity of the system. Based on these ,a new method for the determination of chlorite in water by resonance scattering spectrometry is developed. The influences of the factors, such as the dosages of KI,AO,etc. on the system are investigated. Under the optimized experimental conditions ,the mass concentrations of chlorite is in the range of 7.18×10-4-0.114 mg/L,and have good linear relationship withΔIRS The linear equation of the method isΔIRS=870.39ρ+9.273 9,the related coefficient(R2) is 0.992 7,and the detection limit(3σ) is 1.8×10-4 mg/L.
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