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在p H为3.87的Tris-盐酸介质中,Cu(Ⅱ)与固绿FCF在溴代十六烷基吡啶(TPB)存在下结合生成离子缔合物,使体系的瑞利光散射(RLS)信号显著增强并产生新的瑞利散射光谱,最大瑞利散射峰位于366 nm波长处,Cu(Ⅱ)的质量浓度在0.01~0.22 mg/L范围内与体系的瑞利散射增强程度(ΔIRLS)呈线性关系,检出限为0.009 5 mg/L,定量限为0.013 mg/L。由此建立了高灵敏、快速准确测定Cu(Ⅱ)的瑞利散射新方法,还研究了体系的瑞利散射光谱特征及适宜反应条件。该方法的加标回收率为98.0%~101%,相对标准偏差RSD(n=5)为1.8%~2.4%,适于市售饮料中Cu的测定。
In the Tris-HCl medium with p H of 3.87, Cu (Ⅱ) complexed with solid green FCF in the presence of brominated hexadecylpyridine (TPB) to form ion-association complexes. The Rayleigh light scattering The maximum Rayleigh scattering peak at 366 nm was significantly enhanced and a new Rayleigh scattering spectrum was obtained. The Rayleigh scattering enhancement (ΔIRLS) of Cu (Ⅱ) in the range of 0.01-0.22 mg / L with the concentration of Cu (Ⅱ) Linearity, the detection limit of 0.009 5 mg / L, the limit of quantification of 0.013 mg / L. Therefore, a new sensitive Rayleigh scattering method for the determination of Cu (Ⅱ) has been established. The Rayleigh scattering spectra and the reaction conditions have also been studied. The recovery of this method was 98.0% ~ 101%, RSD (n = 5) was 1.8% ~ 2.4%, which was suitable for the determination of Cu in commercial beverages.