Xue Guo-Qing, Han Yu-Qi, Song Hai, Di Duo-Long
Department of Chemistry, Key Laboratory of Resources and Environment Chemistry of West China, Hexi University, Zhangye 734000, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Jun;27(6):1231-4.
In the present paper the effects of different digestion methods on determining the amount of metal elements in the plant platycodon grandi florum (Jacq.) A. DC. by flame atomic absorption spectrophotometry(FAAS) are reported. FAAS method was established for the determination of K, Mg, Ca, Cu, Zn, Mn, Fe, Co, Ni, Cd and Cr and Pb in the plant platycodon grandi florum (Jacq.) A. DC. The samples were incinerated and followed by digestion with HNO3-HClO (phi, 4 : 1) at 90-95 degrees C and normal pressure. In the meantime, the optimum parameters of FAAS and effects of solution medium on the results were discussed. The analytical results of K, Mg, Ca, Mn, Fe, Cu and Zn were 13 226.32, 922.57, 1 710.72, 9.23, 336.66, 8.75 and 19.62 microg x g(-1) respectively, while Co, Ni, Cd, Cr and Pb were not checked out in the samples. The results showed that the recovery of standard addition was 95.45Y-105.50% and the relative standard deviation (n = 9) was 0.34%-5.78%. The method is quick, simple and convenient, and the results are satisfactory.
本文报道了不同消解方法对火焰原子吸收光谱法（FAAS）测定桔梗（Platycodon grandiflorum (Jacq.) A. DC.）中金属元素含量的影响。建立了FAAS法测定桔梗中K、Mg、Ca、Cu、Zn、Mn、Fe、Co、Ni、Cd、Cr、Pb的含量。样品经灰化后，在90 - 95℃常压下用HNO₃ - HClO（体积比4 : 1）消解。同时，讨论了FAAS的最佳参数以及溶液介质对结果的影响。K、Mg、Ca、Mn、Fe、Cu和Zn的分析结果分别为13226.32、922.57、1710.72、9.23、336.66、8.75和19.62 μg·g⁻¹，而样品中未检出Co、Ni、Cd、Cr和Pb。结果表明，标准加入回收率为95.45% - 105.50%，相对标准偏差（n = 9）为0.34% - 5.78%。该方法快速、简便，结果令人满意。
