新资源食品中微量元素测定方法的研究

用硝酸-高氯酸消解样品，用火焰原子吸收光谱法测定新资源食品葛根、葛花、四叶参、仙人掌、菊花、小麦胚和蚕蛹中Cu，Zn和Fe元素的含量，并对其结果进行了分析。结果显示： 在选定的实验条件下，测定方法的回收率为94.66%～105.24%，测定Cu，Zn和Fe的精密度RSD分别为1.79％，0.71%和4.78%。建立的原子吸收光谱法简便、快速、灵敏、准确。经F检验与SNK检验，河南省新资源食品葛根、葛花、四叶参、仙人掌、菊花、小麦胚和蚕蛹中微量元素Cu，Zn和Fe含量分别为： 铜的分布量依次为: 菊花≈蚕蛹＞葛花≈小麦胚≈四叶参≈葛根＞仙人掌,锌的分布量依次为： 仙人掌＞蚕蛹≈葛花≈葛根≈小麦胚≈四叶参≈菊花;铁的分布量依次为： 蚕蛹≈菊花≈葛根＞葛花≈小麦胚≈四叶参≈仙人掌。

Determination of Trace Elements in New Food Sources by Flame Atomic Absorption Spectrophotometry

Samples were digested by HNO3 + HClO4. Flame atomic absorption spectrophotometry (FAAS) was successfully used to determine copper, zinc and iron in new resource food. Under our experimental conditions, the recovery ratio was 94.66%-108.80%; the precision was 0.71%-4.78%. This method of measuring elements is convenient, rapid and accurate. The results showed that there are profitable elements, such as copper, zinc and iron in new resourse food in Henan province. By F test and SNK test, the content sequence of metal elements was found as follows: copper, Chrysanthemum morifolium Ramat-Silktworm pupa > flowers of Pueraria lobata Ohwin = Wheat germ = Codonopsis lanceolata = roots of Pueraria lobata Ohwi > Opuntia dillenii Haw. Zinc, Opuntia dillenii Haw > Silkzowrm pupa = flowers of Pueraria lobata Ohwi = roots of Pueraria lobata Ohwi = Wheat germ = Codonopis lanceolata = Chrysanthemum morifolium Ramat. Iron, Silkworm pupa = C hrysanthemum morifolium Ramat = roots of Pueraria lobata Ohwi > flowers of Pueraria lobata Ohwi = Wheat germ = Codonopis lanceolata = Opuntia dillenii Haw.