AAS法测定新疆罗布麻叶中的微量元素
2015-10-21雷用东邓小蓉魏向利等
雷用东 邓小蓉 魏向利等



摘要 [目的]采用原子吸收光谱法(AAS)测定新疆罗布麻叶中的微量元素含量,并为新疆罗布麻叶的综合开发利用提供新的科学依据。[方法]采用混合酸进行微波消解,并运用AAS法测定了样品中钾(K)、钠(Na)、钙(Ca)、镁(Mg)、铁(Fe)、铜(Cu)、锰(Mn)、镍(Ni)、钛(Ti)、铅(Pb)、铬(Cr)、镉(Cd)12种微量元素,并进行了加标回收率试验。[结果]采用硝酸(HNO3)-双氧水(H2O2)混合酸消化体系微波消解新疆罗布麻叶样品,测定的结果相对标准偏差为0.97%~3.54%,各元素的加标回收率为98.3%~103.3%。[结论]AAS法具有消解完全、污染少、效率高和准确度高等优点,可应用于新疆罗布麻叶中微量元素的分析与测定。
关键词 罗布麻叶;微量元素;原子吸收光谱法;AAS
中图分类号 S567;TS272.7 文献标识码 A 文章编号 0517-6611(2015)20-141-02
Abstract [Objective] The paper aimed to explore the microelements content of Apocynum ventum leaves by atomic absorption spectrumetry (AAS) method, to provide new scientific basis for the comprehensive exploitation and utilization of Xingjiang Apocynum ventum. [Method] The Apocynum ventum samples were used mixed acid by microwave digestion, and adopted AAS method to determinate microelements kalium(K), sodium(Na), calcium(Ca), magnesium(Mg), iron(Fe), Copper(Cu), manganese(Mn), nickel(Ni), titanium(Ti) and plumbum (Pb), chromium (Cr) and cadmium (Cd) in samples. Besides, a standard addition recovery experiment was carried out. [Result] The results showed that the RSD of the results were 0.97%-3.54% and the recovery rate were 98.3%-103.3% by the method of mixed acid microwave digestion-AAS. [Conclusion] AAS method had completely dissolution, less pollution, high efficient and accuracy, and it can be applied to the analysis and determination of microelements in Xinxiang Apocynum ventum leaves.
Key words Apocynum ventum leaves; Microelements; Atomic absorption spectrometry; AAS
羅布麻(Apocynum ventum L.)为夹竹桃科植物,主要分布在北半球温带和寒温带,在我国以新疆塔里木盆地东部的罗布平原生长最多,产量最高[1]。罗布麻叶为其干燥叶,具有平肝安神、清热利水功能,可用于治疗肝阳眩晕、心悸失眠、浮肿尿少[2]。新疆民间有饮用罗布麻茶的习俗,目前已被开发为茶叶广泛使用,且对罗布麻茶泡茶方案及制茶工艺也有相应研究[3]。罗布麻叶含黄酮类化合物、甾体化合物、儿茶素、氨基酸和异槲皮甙等成分[4],近几年来许多学者的研究主要集中在这些有效成分上,而微量元素含量研究较少。食品中微量元素含量的常规检测方法包括原子荧光光谱法、原子吸收分光光度法(AAS法)、电感藕合等离子体原子发射光谱法、电化学分析法[5-6]。笔者在此采用AAS法考察罗布麻叶中微量元素含量,为新疆罗布麻叶的进一步开发与利用提供依据。……
