铬天青S瑞利光散射技术快速测定面制食品中的Al

Fast determination of aluminum in flour food by Rayleigh light scattering technique with chrome azurol S

研究了在酸性Tris-盐酸缓冲介质和表面活性剂溴化十六烷基三甲基铵存在下,Al（Ⅲ）与铬天青S反应的瑞利散射光谱,建立了定量测定Al（Ⅲ）的瑞利散射新方法。实验表明,体系的结合物使瑞利光散射（RLS）显著增强,并产生新的瑞利散射光谱。最大瑞利散射峰位于371 nm处,瑞利散射增强程度（ΔIRLS）与0.016-0.54 mg·L^-1范围的Al（Ⅲ）的质量浓度呈良好的线性关系,方法的检出限为0.0035 mg·L^-1。方法用于面制食品中Al的测定,回收率为98.1%-102%,相对标准偏差（n=6）为0.8%-1.3%。

In an acidic Tris-Hydrochloric acid buffer medium and in the existence of the surfactant cetyl trimethyl ammonium bromide,the Rayleigh light scattering spectra of interaction of aluminum（ Ⅲ） and chrome azurol S was studied and a new Rayleigh light scattering（ RLS） method for quantifying aluminum（ Ⅲ） was developed. Experiment shows,aluminum（ Ⅲ） can be bound chrome azurol S and cetyl trimethyl ammonium bromide to form a new product,which led to a distinctly enhanced Rayleigh light scattering（RLS）and the appearance of a new Rayleigh scattering spectrum.The maximum Rayleigh scattering peak was located at 371 nm.The Rayleigh light scattering intensity（ △IRLS） was directly proportional to the mass concentration of aluminum（ Ⅲ） in the range of0. 016 to 0. 54 mg·L^-1with the detection limit being 0. 0035 mg·L^-1.The method has been applied to the determination of aluminum in flour foods with values of recovery and RSD（ n = 6） found were in the ranges of 98. 1% - 102%and 0. 8% - 1. 3%respectively.