ICP-AES法测定内蒙古西鄂尔多斯地区全株四合木中金属元素

近年来风沙灾害已成为全球性环境问题。沙生植物具有独特的生态生物学特性，在改善生态环境等方面起着十分重要的作用。采用ICP-AES法测定分析了世界范围内仅集中分布于内蒙古西鄂尔多斯草原化荒漠区的国家二级濒危保护物种——全株四合木中的金属元素，并与其他沙生植物金属含量进行了比较。结果表明，常量元素Ca，K，Mg，Na，Al及植物生命活动所必需的微量元素Fe，Mn，Cu，Zn在全株四合木中表现为不同的含量顺序，主根和老枝：Ca＞Na＞Mg＞Al＞K＞Fe＞Cu＞Mn＞Zn，嫩枝和叶：Ca＞Na＞Mg＞Al＞K＞Fe＞Mn＞Cu＞Zn，须根K＞Ca＞Na＞Mg＞Al＞Fe＞Cu＞Mn＞Zn，且Mn，Zn元素的含量低于陆生高等植物的平均含量。该方法的加标回收率为94.98%～120.0%，RSD＜3.5%，具有良好的准确度和精密度。此测定结果可作为濒危植物和野生植物资源的保护与合理开发利用的参考。

Determination of Metal Elements in Whole Tetraena Mongolia Maxim from West Erdos Region of Inner Mongolia by ICP-AES

The sand storm has become a global environmental problem. Since desert woody plants have many special biological characteristics, they play an important role in improving ecological environment and so on. In the present paper, the contents of ordinary and trace metal elements in whole Tetraena Mongolia Maxim, which only exists in West Erdos Region of Inner Mongolia in the world and is protected and endangered national second-class species, were determined by ICP-AES technique and compared with other desert woody plants. The results indicated that the ordinary elements Ca, K, Mg, Na and Al and the trace elements essential to plant vital activities, such as Fe, Mn, Cu and Zn show different content orders in different parts of the plant. For example, the content orders are Ca>Na>Mg>Al>K>Fe>Cu>Mn>Zn for both main root and old root. In twig and leaf, however, the order is Ca>Na>Mg>Al>K>Fe>Mn>Cu>Zn, while in fibrous root the order is K>Ca>Na>Mg>Al>Fe>Cu>Mn>Zn. The element contents of Mn and Zn are lower than the average content of terrestrial plants. The recovery ratio obtained by standard addition method ranged between 94.98% and 120.0%, and its RSD was lower than 3. 5% with a good precision. The results provide theoretical directions for protecting and exploiting vegetable resource of the endangered and wilding plant.