Rh(Ⅲ)与钨酸盐及罗丹明6G在阿拉伯胶存在下能形成离子缔合物,且该离子缔合物在579nm处具有强烈的共振瑞利光散射信号.据此,建立了一种测定痕量Rh(Ⅲ)的共振瑞利散射光谱法,该方法的线性范围为0.01～0.25ng/mL,检出限为0.0024ng/mL,且大量存在的常见离子对Rh(Ⅲ)的测定不干扰.将方法用于测定催化剂及冶金产品中的铑,结果与标准方法(SnCl2法)测得值基本一致.
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