面制食品中铝含量快速检测方法

A Rapid Determination of Aluminum Content in Flour Products

研究了面制食品中铝含量的快速检测方法。根据实验特点，样品经超声波提取后，三价铝离子、溴代十六烷基吡啶、聚乙二醇辛基苯醚在乙二胺-盐酸缓冲溶液中与铬天青S反应形成蓝色四元混合胶束，该混合胶束物的最大吸收波长为620 nm，其吸光度与铝的含量在0～0.5μg/2.5 mL浓度范围内呈良好线性关系.相关系数r=0.9994，精密度以其相对标准偏差RSD来估计，RSD为2.03%，重复性以其RSD来估计，RSD为1.72%，回收率在82.08%～97.02%；国际通用方法是湿法消解，该法消解液中会残留一定量的HClO4，造成灵敏度低、空白值高、显色反应性差等弊端。本文采用超声波提取法，操作简单，所需试剂少，绿色环保，减小了强酸给人体带来的损害，且重现性好，灵敏度高。因此，超声波提取法在面制食品中铝含量的快速检测方面具有较好的应用前景。

This paper developed the content of aluminum in flour products for rapid detection method. According to the experimental characteristics ,the sample by ultrasonic extraction, Trivalent aluminum ion, cetylpyridinium bromide, polyethlene glycol mono-（P） octyl phengl ether （OP）, ether in ethylenediamine-HCl buffer solution with chromazurol S react to form a blue quaternion-association. The mixed micelles maximum absorption wavelength is 620 nm. The absorbance with aluminum content in the range of 0-0.5 μg/2.5 mL concentration showed a good linear relationship. Correlation coefficient r = 0.999 4. Precision and repeatability have been estimated by the relative standard deviation （RSD）, RSD is 2.03%and 1.72%respectively, and the recovery was in the range of 82.08%-97.02%. International common method was to wet digestion, this method will be left a certain amount of HClO4 in digestion solution, resulting in low sensitivity, the blank value was high, and poor color reaction drawbacks. However, using ultrasonic extraction, this method was applied to detect the content of simple operation, less reagent was added, green, reduced the acid to human body harm, and demonstrated favorable sensitivity, high selectivity and excellent reproducibility. As a conclusion, this method is promising for use in many applications of aluminum content in flour products.