超声消解火焰原子吸收光谱法测定大米中的锌

Detection of Zinc in Rice by Ultrasonic Dispelling Flame Atomic Absorption Spectrometry

[目的]探索超声消解火焰原子吸收光谱法测定大米中锌含量的效果。[方法]采用超声波方法对大米样品处理后再进行碳化酸溶消解法消化试样,用火焰原子吸收光谱仪测定锌的含量。[结果]超声波消解大米的最佳条件为超声20 min、固液比1∶6和硝酸∶高氯酸=3∶3。将滤渣按上述条件再次消解,测其吸光度值非常小,说明大米粉消解很完全。与碳化酸溶消解法比较,超声消解火焰原子吸收光谱法的效果更好,RSD为1.362%。[结论]采用均匀试验设计进行超声波结合碳化酸溶消解-火焰原子吸收光谱法测定大米中锌的含量,简便,快速,准确,是一种比较理想的方法。

[ Objective] The aim was to explore the effect of using ultrasonic dispelling flame atomic absorption spectrometry to detect the zinc content in rice. [ Method ] After the rice samples were treated by the ultrasonic wave, the tested samples were digested by carbonized-acid-dissolution method and the zinc content was detected by flame atomic absorption speetrophotometer. [ Result ] The optimum condition for digesting rice by ultrasonic wave was that ultrasonic for 20 min, ratio of solid to liquid of 1：6 and the nitric acid： perchloric acid of 3：3. The filter residue was digested again according to the above condition and the detected absorbance value was small, which showed that the digestion of rice power was complete. Compared with the carbonized-acid-dissolution method, the effect of ultrasonic dispelling flame atomic absorption spectrometry was better and its RSD was 1. 362%. [ Conclusion] The method of combining ultrasonic wave with carbonized-acid-dissolution- flame atomic absorption spectrometry designed according to uniform experiment was a more ideal method to detect the zinc content in rice and it was convenient, quick and accurate.