微波消解-原子吸收光谱法测定不同产地淡竹叶中微量元素的含量

利用微波消解技术处理样品,采用原子吸收光谱法测定了我国广东、湖北、湖南、重庆、广西、江苏、福建、浙江、安徽九个不同产区淡竹叶中Zn,Fe,Cu,Mn,K,Ca,Mg,Ni,Cd,Pb,Cr,Co,Al,Se,As 15种微量元素的含量。该方法的相对标准偏差(RSD)在1.23%~3.32%之间,平均回收率在95.8%~104.2%之间。研究表明,该方法简便、快速、灵敏,适合于淡竹叶中微量元素的测定。试验分析结果表明,不同产地淡竹叶中微量元素的含量呈现地域性差异。各地区的淡竹叶中对人体有益的元素K,Mg,Ca,Fe,Mn含量普遍较丰富;对人体有害的重金属元素,除湖南产的淡竹叶中Pb的含量稍高,广东、安徽产的淡竹叶中Cu的含量偏高外,其他产区的淡竹叶中有害重金属元素Cd,Cu,Cr,Pb,As的含量均低于《中国药典》、《药用植物及其制剂进出口绿色行业标准》及《国家标准食品卫生标准》的限量标准。该测定结果为进一步探讨淡竹叶中微量元素的含量与其功效的相关性提供了科学依据。

Determination of Trace Elements in Lophatherum Gracile Brongn from Different Habitat by Microwave Digestion-Atomic Absorption Spectroscopy

A method of microwave digestion technique was proposed to determine the content of Zn,Fe,Cu,Mn,K,Ca,Mg,Ni,Cd,Pb,Cr,Co,Al,Se and As in lophatherum gracile brongn of different habitat by atomic absorption spectroscopy.The RSD of the method was between 1.23% and 3.32%,and the recovery rates obtained by standard addition method were between 95.8 %and 104.2%.The results of the study indicate that the proposed method has the advantages of simplicity,speediness and sensitivity.It is suitable for the determination ...