[目的]建立微波消解-石墨炉原子吸收光谱法测定凉山川牛膝中铅和镉元素含量的方法.[方法]用浓硝酸微波消解样品,选用10μl浓度2 g/L Mg( NO3)2 +2 g/L NH4H2PO4和10μl浓度2g/L NH4H2PO4作为基体改进剂,采用标准曲线法测定.[结果]采用微波消解-石墨炉原子吸收光谱法测定川牛膝中铅和镉含量RSD为4.5％～5.2％,回收率为95％～105％.经测定,凉山川牛膝牛含有铅5.24μg/g,镉1.29μg/g.[结论]采用微波消解-石墨炉原子吸收光谱法测定川牛膝中铅和镉含量方法简单、准确,结果令人满意.%[Objective ] The aim was to determine the content of Pb and Cd in Cyathula officinalis Kuan by using microwave digestion -graphite furnace atomic absorption spectrometry. [ Methods ] The samples were diluted with concentrated nitric acid (HNO3) microwave digestion; 10 μl 2 g/L Mg (NO3)2 ,2 g/L NH4 H2 PO4 and 10 μl 2 g/L NH4H2PO4 were used as matrix modifier; finally calibration curve method was applied upon the result. [Results] Based on the determination, rhicrowave digestion-graphite furnace atomic absorption spectrometry was used to determine the content of Pb and Cd in Cyathula officinalis Ruan,the results indicated that RSD were among 4.5% -5.2% ,recovery rate were in the range of 96% - 107%. The content of Pb and Cd in Cyathula officinalis Kuan were 5.24 and 1.29 μg/g,respectively. [Conclusion] To determine the content of Pb and Cd in Cyalhula officinalis Kuan by using microwave digestion-graphite furnace atomic absorption spectrometry was accurate and satisfying.
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