石墨炉原子吸收光谱法测定中药中微量金属元素

采用石墨炉原子吸收光谱法(GFAAS)测定了中药中微量金属元素的含量. 对基体改进剂硝酸镍的用量、 灰化温度、 原子化温度等实验参数进行了优化. 实验结果表明， 加入硝酸镍不仅能提高测定的灵敏度， 还能有效消除共存离子的干扰. 在选定的实验条件下， 分析测定了中药秦皮(cortex fraxini)、 槐花(flos sophorae)、 淫羊藿(herba epimedii)、刺五加(radix acanthopanacis)和黄芩(radix scutellarae)中镉、 铅、 锗和砷的含量， 回收率为90%~110%， 方法的相对标准偏差小于8%. 该法快速、 可靠， 为中药中微量元素的测定提供了一种简便方法.

Determination of trace elements in traditional Chinese medicines by graphite furnace atomic absorption spectrometry

A method for the determination of trace elements in 5 kinds of traditional Chinese medicines by graphite furnace atomic absorption spectrometry(GFAAS) is described. The matrix modifier used in this work was Ni(NO_3)_2. The effects of matrix quantity, ashing temperature and atomization temperature were investigated. The matrix modifier (Ni(NO_3)_2) can not only improve the sensitivity of determination, but also eliminate the interference of foreign ions. Under the optimum experimental conditions, cadmium, lead, germanium and arsenium in traditional Chinese medicines such as cortex fraxini, flos sophorae, herba epimedii, radix acanthopanacis and radix scutellarae were determined. The recoveries are between 90% and 110%, the relative standard deviation is less than 8%. This method is rapid and reliable. It is a simple method for the determination of trace elements in traditional Chinese medicines.