微波消解–石墨炉原子吸收法测定药食两用中药材中的铅

Determination of Lead in Medicine and Food Dual Purpose Traditional Chinese Medicine by GFAAS with Microwave Digestion

建立测定药食两用中药材中铅含量的微波消解-石墨炉原子吸收光谱分析方法。样品经微波消解后，以2％磷酸二氢铵为基体改进剂，用石墨炉原子吸收法测定药食两用中药材中的铅含量。在2-40μg／L范围内，铅的质量浓度与吸光度呈良好的线性关系，线性相关系数r大于0．999，检出限为5μg／kg。加标回收率为94．0％～105．5％，测定结果的相对标准偏差小于5．0％（n=6）。该方法操作简便快速，准确度较高，基体干扰小，适合药食两用中药材中铅的检测。

A method for determination of lead in medicine and food dual purpose traditional Chinese medicine by GFAAS with microwave digestion was established. After digested by microwave, the sample was analyzed by graphite furnace atomic absorption spectrometry using 2% NH4H2PO4 as matrix modifier. The linear range of the method was 2-40 μg/L, the concentration and absorbance of lead had good liner relationship with the correlation coefficients greater than 0.999, and the detection limit was 5 μg/kg. The recoveries were 94.0%-105.5%, and the relative standard deviations of determination results were less than 5.0%（n=6）. This method is simple, rapid, accurate, less matrix interference, and it is suitable for the determination of lead in medicine and food dual purpose traditional chinese medicine.