火焰原子吸收法测定不同产地栽培黄芪中13种金属元素含量

Determination of 13 metal elements in the roots of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao from different regions by flame atomic absorption spectrophotometry(FAAS)

目的:应用火焰原子吸收法测定不同产地栽培黄芪中的金属元素 Na、K、Mg、Ca、Cu、Zn、Mn、Fe、Co、Ni、Cd、Cr、Pb 含量。方法:采用先灰化、再用体积比为4:1的硝酸-高氯酸常压微沸条件下消解黄芪样品,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:河东、河西栽培黄芪中 Na、K、Mg、Ca、Mn、Fe、Cu、Zn 含量分别为1571.2,3962.0,2057.8,2968.0,10.4,406.7,8.2,12.2 μg·g^(-1)和227.2,11274.8,1047.1,983.5,10.5,362.3,11.3,19.9 μg·g^(-1)。Co、Ni、Cd、Cr、Ph 未检出。方法的加样回收率为97.16%～102.7%,精密度 RSD(n=9)为0.5%～2.6%。结论:测定方法简单易行,方便快捷,结果令人满意。

Objective： To determine the amount of metal elements in the roots of Astragalus membranaceus （ Fisch. ） Bge. var. mongholicus （ Bge. ） Hsiao from different regions by flame atomic absorption spectrophotometry （FAAS）. Method： FAAS was established for the determination of Na, K, Mg, Ca, Cu, Zn, Mn, Fe, Co, Ni, Cd, Cr, Pb in the roots of Astragalus membranaceus （ Fisch. ） Bge. var. mongholicus （ Bge. ） Hsiao. The samples were calcinated and followed to digest with HNO3 -HClO4 （4：1 ） at 90 -95 ℃ under normal pressure. In the meantime, the optimum parameters of FAAS and effects of solution medium on the results were studied. Results： Analytical results of Na, K, Mg, Ca, Mn, Fe, Cu, Zn respectively, the roots of Astragalus membranaceus （ Fisch. ） Bge. var. mongholicus （ Bge. ） Hsiao,from different habitats were 1571.2,3962.0,2057.8,2968.0,10.4,406.7,8.2,12.2 μg · g^-1 and 227.2, 11274.8,1047.1,983.5,10.5,362.3,11.3,19.9 μg · g^-1 ,and Co,Ni,Cd,Cr,Pb had not been detected in the sampies. The results showed that the recovery of additional standard was 97.16% - 102.7% ,the precision（ RSD,n =9） was 0.5% -2.6%. Conclusion：The characteristic method is quick, simple and convenient with satisfactory results.