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中国农学通报 ›› 2010, Vol. 26 ›› Issue (17): 125-128.

所属专题: 畜牧兽医

• 农学 农业基础科学 • 上一篇    下一篇

石墨炉原子吸收光谱法测定鼠尾草属植物铅和镉的含量

刘琪 张利 杨在君 杨瑞武 丁春邦 周永红 谢显丽   

  • 收稿日期:2010-03-12 修回日期:2010-03-25 出版日期:2010-09-05 发布日期:2010-09-05
  • 基金资助:

    四川省青年科技基金项目;四川省科技厅科技支撑项目;四川省科技厅应用基础项目

Determination of Lead and Cdmium in Salvia by Graphite Furnace Atomic Absorption Spectrometry

  • Received:2010-03-12 Revised:2010-03-25 Online:2010-09-05 Published:2010-09-05

摘要:

利用石墨炉原子吸收光谱法测定鼠尾草属植物中微量的铅和镉,讨论了基体改进剂、灰化温度以及原子化温度三个测定因素,并对共存离子的干扰做了研究,在实验条件优化情况下,测定铅和镉的方法检出线分别为1.97 ng?mL-1和0.550 ng?mL-1,加标回收率分别为97.20%~105.6%和94.70%~110.6%,样品相对标准偏差分别为0.25%~6.8%和0.14%~4.7%,建立了测定鼠尾草属植物中铅和镉含量的方法。结果得出实验样品中丹参铅和镉含量都符合《中华人民共和国药典》标准,仅有贵州鼠尾草和血盆草的铅含量超标。

关键词: 盐碱土, 盐碱土, 野生大豆, 氮, 盐离子

Abstract:

A method for determination of trace lead and cadmium in Salvia by graphite furnace atomic absorption spectrometry(GFAAS) was described. The influences of ashing/ atomization temperature, the matrix modifier and coexistent ions on analytical signals were investigated in detail. As a result, the detection limit of this method were 1.97 ng?ml-1 and 0.550 ng?ml-1. The average recoveries of potassium and sodium in sample were 0.25%~6.8% and 0.14%~4.7%, 0.44%~3.63% respectively, and the relative standard deviations of sample are 0.25%~6.8% and 0.14%~4.7% respectively. The test result proved that this method, which determination of lead and cadmium in Salvia by GFAAS, has its advantages of simple, high accuracy, fine precision, as well as great reproducibility. Finally, the concents of lead and cadmium, which in all the sample of S. miltiorrhiza Bunge, accord with Chinese Pharmacopoeia’s standard. But there were S. cavaleriei and S. cavaleriei var. simplicifolia whose lead content exceeded the standard.