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在过量溴化钾存在的稀磷酸介质中 ,乙基紫的共振瑞利散射十分微弱 ,但是当乙基紫与配阴离子 [I2 Br]-反应 ,形成离子缔合物时 ,共振瑞利散射显著增强并出现一个新的共振瑞利散射光谱 .其共振瑞利散射峰位于 5 3 5nm和 3 3 5nm .研究了该反应的适宜条件和影响因素 .碘的浓度范围在 0～ 0 64μg/mL时 ,共振瑞利散射强度与碘的浓度成正比 .该方法具有较高的灵敏度 ,碘离子的检出限为 1 5 8ng/mL .该法具有较好的选择性 ,可用于痕量碘离子的测定 .
Resonance Rayleigh Scattering of Ethyl Violet is very weak in the dilute phosphoric acid medium in the presence of excess potassium bromide, but the resonance Rayleigh scattering is significant when Ethyl Violet reacts with the anion [I2 Br] - to form the ion association complex A new resonance Rayleigh scattering spectrum was obtained and the resonance Rayleigh scattering peaks were located at 535nm and 3535nm.The appropriate conditions and influencing factors of the reaction were studied.The concentration of iodine in the range of 0 ~ 648μg / mL , The resonance Rayleigh scattering intensity is proportional to the concentration of iodine.The method has high sensitivity and the detection limit of iodine ion is 15 58ng / mL.The method has good selectivity and can be used for trace iodine ion Determination.