ICP-AES测定食品中二氧化钛的方法研究

Method research on titanium dioxide determination in foods by ICP-AES

目的：对食品中二氧化钛的测定方法进行规范化研究，使其存在的问题得到了解决。方法：样品经混合酸湿法消解后，在最佳光谱条件下，用电感耦合等离子体一原子发射光谱仪进行食品中二氧化钛的测定。结果：按取样量1．000g经消解完全后定容至25．0ml计算，方法的检出限为0．07mg／kg，加标回收率为92．8％～102．8％，相对标准偏差为1．3％～5．0％，定容后的测试样于4℃冰箱至少可以保存7d。结论：该方法快速、准确、灵敏度高、有良好的重现性及稳定性，对食品中不同浓度二氧化钛含量的测定均适用。

Objective ： To establish a more practical method to determine titanium dioxide in foods, so as to solve the existing problems of previous method. Methods： The samples were digested by mix acid and determined under suitable spectrum condition by ICP - AES. Results ： The detection limit of the method was 0.07 mg/kg in term of the constant volume of 25.0ml after complete digestion with sample quantity of 1. 000 g. The recovery was between 92.8% and 102.8%. The RSD was between 1.3% and 5.0% and the sample was stable in 7 d under 4℃. Con- clusion ： The method can be applied to determination of titanium dioxide at different concentrations in foods with ra- pidity , accuracy, high sensitivity, better reproducibility and stability.