火焰原子吸收光谱法测定栽培板蓝根中14种金属元素含量

Determination of the contents of 14 metal elements in planted Isatis indigotica Fort. by flame atomic absorption spectrophotometry

目的:测定栽培板蓝根中14种金属元素含量.方法:采用硝酸:高氯酸(4:1)常压微沸条件下消解板蓝根样品,应用火焰原子吸收法测定栽培板蓝根中的金属元素K、Mg、Ca、Cu、Zn、Fe、Co、Ni、Mn、Pb、Cr、Cd、Au、Ag含量,研究了测定不同元素的仪器最佳工作条件,并作了方法的准确性和精密度考察.结果:栽培板蓝根中K、Mg、Ca、Fe、Zn、Cu、Mn、Pb、Ag含量分别为10 468.5、450.6、580.8、315.1、20.6、3.7、16.5、3.3、0.2μg/g,Co、Ni、Cr、Cd、Au未检出.加样回收率为95.28%～104.50%,相对标准差(n=9)为0.2%～5.0%.结论:测定方法简单易行,方便快捷.

Objective: To determine the contents of 14 metal elements: K, Mg, Ca, Cu, Zn, Fe, Mn, Ni, Co, Pb, Cr, Cd, Ag and Au in planted Isatis indigotica Fort. by flame atomic absorption spectrophotometry ( FAAS). Methods: The planted Isatis indigotica Fort. was digested with HNO3-HClO4(4 : 1) at 90-95 C and normal pressure. The contents of 14 metal elements were determined by FAAS method. The optimal working conditions of FAAS were studied. Results: The contents of K, Mg, Ca, Fe, Zn, Cu, Mn, Pb and Ag were 10 468. 5,450.6,580. 8,315. 1,20. 6,3. 7,16. 5,3. 3 and 0. 2 μg/g, respectively and Co, Ni, Cr, Cd, Au were not detected in the samples. The recovery rates of the samples added were 95. 28%-104. 50%, with relative standard deviation (n = 9) being 0. 2%-5. 0%. Conclusion: The characteristics of this method are quick, simple and convenient.