微波消解-ICP-AES法测定泰顺茶叶中的微量元素

Determination of Trace Elements in Tea from Taishun County by ICP-AES with Microwave Digestion

用硝酸-H2O2作消解剂进行微波消解,以电感耦合等离子体发射光谱法测定泰顺地区6种茶叶中的Fe、Mn、Zn、Cd、Cu、Se、Pb、Co、Sn、V、Cr、Ni 12种微量元素含量.结果表明：在优化条件下,茶叶样品中所测元素的加标回收率为92.0％～106.5％,相对标准偏差小于5.0％,测定方法简便、快速、准确.所测泰顺茶叶样品含有丰富的有益微量元素,Cd、Pb、Cr等重金属元素含量均低于相关的国家限量标准.

The contents of twelve elements including Fe, Mn, Zn, Cd, Cu, Se, Pb, Co, Sn, V, Cr and Ni in tea leaves from Taishun county were determined by inductively coupled plasma-atomic emission spectrometry （ICP-AES）. Tea samples were digested by microwave with HNO3-H2O2. The results showed the recoveries of twelve elements from spiked tea samples were in the range of 92.0%-106.5%, with relative standard deviations （RSD） less than 5.0% under the optimal conditions. The method is simple, rapid and accurate. The essential trace elements for human in Taishun tea samples were rich, while the contents of Cd, Pb and Cr in the tea samples were lower than the permitted levels in the national standards.