微波消解-FAAS测定番木瓜不同部位的金属元素含量

Determination of Metal Elements in Different Parts of Papaya by Flame Atomic Absorption Spectrometry with Microwave Digestion

为探讨番木瓜果肉、果皮、瓜籽中金属元素的含量,采用微波消解-FAAS法测定了番木瓜3个部位的K、Na、Ca、Mg、Cu、Fe、Zn共7种金属元素的含量,并对微波消解条件进行了优化。结果显示,在优化的微波消解条件下,样品消解完全、速度快、效果好,FAAS测定的各金属元素质量浓度与吸光度均呈良好的线性关系,相关系数r为0.995 7～0.999 9,检出限为0.002～0.131,回收率为98.30%～101.67%,RSD为0.20%～4.12%(n=6),说明测定方法可靠,结果稳定;番木瓜3个部位均含有较高的K、Ca、Mg,但Cu、Fe、Zn含量均较低,与番木瓜果肉相比,番木瓜果皮和瓜籽中K、Mg、Cu、Zn、Fe含量较高,食品和药品开发优势更突出。

In order to explore the contents of metal elements in the papaya pulp, peel and seed, flame atomic absorption spectrometry （FAAS） method was used for determination of K,Na,Ca, Mg,Cu,Fe and Zn in the three parts of papaya. In addition,the digesting conditions were opti- mized. The results showed that under the optimized microwave digestion conditions and FAAS method, the samples were digested quickly and completely, there was a good linear relation be- tween the concentration of the metal element standards and the absorbance value,the correlation coefficient was 0. 995 7- 0. 999 9, the detection limit was 0. 002 -0. 131, the recovery rate was 98. 30%-101.67% and RSD was 0. 20%-4.12%（n=6）. So microwave digestion-FAAS was a fast good detection method with complete digestion,less interference and stable measurement re- sults. There were more K, Ca, Mg and less Cu, Fe, Zn in the three parts of papaya; there were more K,Mg,Cu,Zn,Fe in papaya peel and seed than in pulp,so papaya peel and seed had more ad- vantage of development in food and medicine.