湿法消解-电感耦合等离子体发射光谱法测定保健食品中7种常见矿物质元素

目的建立湿法消解-电感耦合等离子体发射光谱法测定保健食品中铜、锰、铁、锌、钙、镁、钾7种常见矿物质元素的含量。方法使用高氯酸含量较高的硝酸-高氯酸体系湿法消解样品,彻底消解保健食品中难以消解的植物油、甘油、乙二醇、二氧化钛等化合物,使用电感耦合等离子体发射光谱法配备更节省氩气的微型炬管上机测定样品。结果在一定质量浓度范围内, 7种元素线性关系良好,相关系数大于0.999,检出限为0.2~10mg/kg,定量限为0.6~30mg/kg,加标回收率在92.1%~104.7%,相对标准偏差小于3.89%。结论本方法前处理消解样品完全、物理化学干扰少、结果准确可靠,具有良好的精密度和回收率,适用于保健食品中7种常见矿物质元素的准确检测。

Determination of 7 kinds of common mineral elements in health food by wet digestion and inductively coupled plasma optica emission spectrometry

Objective To establish a method for determination the contents of 7 kinds of common mineral elements(copper, manganese, iron, zinc, calcium, magnesium, and potassium) in health food by wet digestion-inductively coupled plasma optica emission spectrometry. Methods The sample was digested by the wet method of nitric acid-perchloric acid system with high content of perchloric acid, and the vegetable oil, glycerin, ethylene glycol, titanium dioxide and other compounds difficult to be digested in health food were completely eliminated. The samples were measured by inductively coupled plasma emission spectrometry with a miniature torch with more argon saving. Results Within a certain mass concentration range, the 7 elements had good linear relationships, and the correlation coefficients were greater than 0.999. The limits of detection were 0.2-10 mg/kg, the limits of quantification were 0.6-30 mg/kg, the recovery rates of standard addition were 92.1%-104.7%, and the relative standard deviations were less than 3.89%. Conclusion This method has complete pre-treatment and digestion of samples, less physical and chemical interference, accurate and reliable results, good precision and recovery rate, and is suitable for the accurate detection of 7 kinds of common mineral elements in health food.