建立了检测皮蛋中Cd的共振瑞利散射法，研究了共振瑞利散射光谱特征、共存物质的影响及反应机理。在pH 4.81的Tris-盐酸缓冲介质中，溴代十六烷基吡啶（TPB）增敏酸性品红与Cd （Ⅱ）结合生成三元离子缔合物，使体系的共振瑞利散射（RRS）显著增强并产生新的RRS光谱，在最大共振瑞利散射峰372 nm处，Cd （Ⅱ）的质量浓度在0.004~0.39 mg/L范围内与体系的共振瑞利散射增强程度（ΔI_RRS）呈线性关系，定量限为0.019 mg/kg。方法简便、准确、灵敏，加标回收率为97.1%~102%，相对标准偏差RSD（n=5）为2.3%~2.8%。方法适于皮蛋中Cd的测定。

A new resonance Rayleigh scattering (RRS) method for the determination of Cd in preserved eggs is established.The spectrum characteristics of RRS,the effects of coexistent substances and reaction mechanism of ternary complex are discussed.In a tris-hydrochloric acid buffer medium of pH 4.81,cetylpyridine bromide (TPB) increases sensitivity of acid magenta and combines with cadmium(Ⅱ) to form ternary ion association complexes,which distinctly enhances RRS of system and produces a new RRS spectrum.The maximum RRS peak locates at 372 nm.The mass concentration of cadmium(Ⅱ) in the range of 0.004 to 0.39 mg·L^-1 is directly proportional to the RRS enhanced intensity (ΔI_RRS)of system with the limit of quantitation at 0.019 mg·kg^-1.This method is simple,accurate and sensitive.The recovery rate of adding standard substance is in the range of 97.1%-102%.The relative standard deviation (n=5) is 2.3%-2.8%.This method is suitable for the determination of cadmium in preserved eggs.

张淑琼(1963-),女,学士,副教授,研究方向为分子光谱分析,zhangshuqiong2017@163.com