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钾、钠、镁是人体不可或缺的营养元素,其来源就在于人体每日摄入的食物,因此食品中钠、钾、镁含量的测定对于保证人体健康有重要意义。国家标准推荐的方法为火焰发射光谱法[1],在实际测定中发现标准曲线仅在较低较窄的浓度范围内呈线性;而在火焰原子吸收光谱法中[2,3],如采用这些元素的共振线作为分析线,则灵敏度过高,同样不利于检测。样品液浓度须控制在标准系列的最大浓度点以下数据方可靠,由于食品中钾、钠、镁浓度通常较高,因此很多
Potassium, sodium and magnesium are indispensable nutrition elements of the human body. Their source lies in the daily intake of food by the human body. Therefore, the determination of sodium, potassium and magnesium content in food is of great significance for ensuring human health. National standard recommended method for the flame emission spectrometry [1], in the actual measurement found that the standard curve was linear only in the lower and narrower concentration range; flame atomic absorption spectrometry [2,3], such as the use of The resonant line of these elements as the analysis line, the sensitivity is too high, the same is not conducive to detection. The concentration of the sample solution to be controlled at the maximum concentration point of the standard series The following data reliable, due to the high potassium, sodium, magnesium concentrations in food, so a lot