火焰原子吸收光谱法测定耐海水库拉索芦荟中微量元素

Determination of Trace Elements in Aloe Barbadensis Miller Irrigated with Seawater by Atomic Absorption Spectrophotometry

耐海水库拉索芦荟经硝酸和高氯酸干法消化后,在样品中加入氯化镧作为释放剂以消除共存离子的干扰,采用火焰原子吸收光谱法测定了Ca,Mg,K,Na,Mn,Zn,Fe,Cu和Pb元素的含量。标准加入法的回收率为96·58～104·31%,10次平行测定结果的相对标准偏差RSD均小于2%。此种方法灵敏度高,操作简便快速,结果准确,重现性好。结果表明,耐海水库拉索芦荟中各元素含量差异显著,其中Ca,Mg,Na和K的含量比较丰富,Mn,Fe和Zn的含量中等,而Cu和Pb的含量很低。海水灌溉的库拉索芦荟含有人体必需的微量元素,而对身体有害的元素如Pb含量却相当低,这说明海水灌溉的库拉索芦荟具有一定的药用和经济价值。本实验结果为进一步探讨海水灌溉的库拉索芦荟提供实际依据。

The dry leaves of Aloe barbadensis Miller irrigated with seawater were dissolved in nitric acid and then oxygenated by perchloric acid.Nine kinds of trace elements in the samples were determined by atomic absorption spectrophotometry,including calcium,potassium,magnesium,sodium,manganese,zinc,iron,copper and lead,with added lanthanum chloride as releaser to eliminate the interference of co-existent ions.The recoveries were 96.58%-104.31%,and the relative standard deviations of sample determination（10 times） were less than 2%.This method is simple,sensitive and rapid with satisfactory results and good reproducibility.The results indicated that there were rich Ca,Mg,K and Na,and moderate Mn,Zn and Fe elements in the Aloe barbadensis Miller irrigated with seawater.However,the concentrations of Cu and Pb were low.Therefore,Aloe barbadensis Miller irrigated with seawater has officinal and economic values.These results provide data for further research on Aloe barbadensis Miller irrigated with seawater.