在pH =3.2的HC1介质中,Fe(Ⅲ)氧化Ⅰ-产生Ⅰ2,Ⅰ2与过量Ⅰ-形成Ⅰ-3,Ⅰ-3与吖啶红(AR)通过静电引力缔合形成AR-Ⅰ3离子缔合物(结合比为n(Ⅰ-3)∶n(AR) =1∶1),AR-Ⅰ3分子自动聚集形成(AR-Ⅰ3)n缔合物微粒,从而引起共振散射光谱显著增强,其最大散射峰位于468 nm.实验研究了介质条件、共振探针用量等因素对散射体系的影响,考察了该散射反应稳定性及共存物质的影响,并对反应机理和散射光谱增强的原因进行了探讨.结果表明,Fe(Ⅲ)与共振光散射强度增强值△I468nm在0.08 ～0.56 mg/L范围内呈现良好线性关系,检测限为5.76×10-7g/L.该方法有较好的选择性,可用于水样中痕量Fe(Ⅲ)的测定,结果与原子吸收法一致,回收率为96.0％ ～ 102.4％,相对标准偏差小于3.3％.
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