微波消解-原子吸收光谱法分析并比较不同时期地锦草中的微量元素

地锦草为大戟科地锦(Euphorbia humifusa Willd.)的干燥全草，本文采用微波消解技术对采集于不同时期的地锦草进行消解，然后利用火焰原子吸收分光光度法(FAAS)测定了不同时期地锦草中8种微量元素的含量，并且对各微量元素含量在不同时期的变化进行了研究分析。实验结果表明，不同时期地锦草中的微量元素与季节有关，元素Fe在6月的地锦草中含量最高，元素K在8月的地锦草中含量最高，地锦草中Mn在9月时含量最高，元素Na在10月份含量最高，地锦草中Ca含量在11月时最高，地锦草中的Zn，Cu和Mg含量在12月时最高，微量元素Na及Ca的变化比较跳跃，而Cu和Zn含量的变化比较缓和。研究结果可为中药地锦草采集时间的选择提供科学的依据。

Analysis and Comparison of Trace Elements of Herba Euphorbiae Humifusae in Different Periods by Microwave Digestion-Atomic Absorption Spectroscopy

Herba euphorbiae humifusae is the dried whole plant of Euphorbia humifusa Willd. that belongs to euphorbiaceae. In the present paper, the microwave digestion procedure was used to digest herba euphorbiae humifusae collected in different periods, and then flame atomic absorption spectrometry (FAAS) was used to determine the contents of eight kinds of trace elements of herba euphorbiae humifusae in different periods, and the change in the contents of trace elements at different times was studied and analysed. The results showed that of all the trace elements of herba euphorbiae humifusae in different periods, element Fe was the highest in June, element K was in August at the highest level, element Mn reached the highest content in September, elements Na and Ca were dividedly at the highest content in October and November, and in December the highest content elements were Zn, Cu and Mg. In one word, the change of Na and Ca was jumping, while the change of Cu and Zn was comparatively mild. The results provide scientific basis for the time of collection of herba euphorbiae humifusae.