湿式消解-石墨炉原子吸收光谱法测定金线莲铅、铜、镉含量

摘要

采用湿式消解法对金线莲药材进行处理，石墨炉原子吸收光谱法测定其铅(Pb)、铜(Cu)、镉(Cd)等重金属元素含量。结果表明，Pb、Cu、Cd 三种元素的原子化温度分别是2100、2200和1800℃，灰化温度分别是400、800和250℃。Pb、Cu、Cd三种元素的检出限分别为0.47、0.50、0.62µg·L-1，其加标回收率在92.7%～94.0%之间，平均相对标准偏差为1.71%，说明仪器精密度良好，湿式消解-石墨炉原子吸收光谱法能有效测定金线莲药材中Pb、Cu、Cd含量。%The samples were treated by wet digestion method to measure the content of Pb, Cu, Cd in Anoectochilus roxburghii by using graphite furnace atomic absorption spectrometry (GFAAS). The results showed that the atomization temperature of Pb, Cu, Cd were 2100, 2200 and 1800℃, the ashing temperature were 400, 800 and 250℃, and their detection limits were 0.47, 0.50 and 0.62 µg·L-1, respectively. The spike recoveries ranged from 92.7% to 94.0%, and the average precision relative standard deviation was 1.71%, which showed that this method is effective and reliable for determination of Pb, Cu, Cd inA. roxburghii.