FAAS法测定苦杏仁和甜杏仁中的13种金属元素

Determination of Thirteen Metal Elements in Prunus Dulcis and Semen Armeniacae Amarum by FAAS

采用硝酸、高氯酸(V/V=4/1)常压微沸条件下消解苦杏仁和甜杏仁样品,火焰原子吸收法测定苦杏仁和甜杏仁中的金属元素:Mn、Ca、K、Mg、Na、Zn、Cu、Fe、Co、Cd、Ni、Pb、Cr的含量,研究了测定不同元素仪器的最佳工作条件、方法的准确度和精密度。结果表明:苦杏仁中Mn、Ca、K、Mg、Na、Zn、Cu、Fe、Co、Cd、Ni和Pb的含量分别为11.756,1614.167,5153.191,238.478,97.668,274.836,16.844,546.316,9.952,3.474,5.979,2.143μg.g-1,Cr未检出,方法回收率(n=9)在97.32%—102.57%之间,RSD(n=9)在0.14%—2.22%之间;甜杏仁中Mn、Ca、K、Mg、Na、Zn、Cu、Fe、Co、Cd、Ni和Pb的含量分别为6.622,1937.503,8663.824,216.956,257.546,77.961,12.483,372.183,7.990,3.666,2.268,3.214μg.g-1,Cr未检出,方法回收率(n=9)在97.23%—102.43%之间,RSD(n=9)在0.47%—2.14%之间。该法快速,简单,准确度和精密度均较高,能达到分析要求。

The contents of thirteen metallic elements in semen armeniacae amarum and prunus dulcis were determined by flame atomic absorption spectrophotometry（FAAS）.The samples were treated with HNO3∶HClO4（4∶1） under the digest system of normal pressure. The experimental conditions were optimized. The contents of Mn,Ca,K,Mg,Na,Zn,Cu,Fe,Co,Cd,Ni,Pb in semen armeniacae amarum were 11.756,1614.167,5153.191,238.478,97.668,274.836,16.844,546.316,9.952,3.474,5.979 and 2.143μg/g,and those of in prunus dulcis were 6.622,1937.503,8663.824,216.956,257.546,77.961,12.483,372.183,7.990,3.666,2.268 and 3.214μg/g,respectively.Cr was not found in the samples.The method is simple and rapid with good precision and accuracy.The experimental results showed that the relative standard deviation in measurement was 0.14%—2.22%（n=9）,and the recovery of samples standard addition was 97.23%—102.57%.