全反射X射线荧光光谱法测定松子仁中16种矿物元素的含量

Determination of 16 Mineral Elements in Pine Nut by Total Reflection X-ray Fluorescence Spectrometry

摘要: 提出了全反射X射线荧光光谱法测定松子仁中钾、钙、钛、钒、铬、锰、铁、钴、镍、铜、锌、砷、硒、铷、锶和铅等16种矿物元素的含量。松子仁样品在MWS-2微波消解系统中,于180 ℃下微波消解50 min,以镓为内标物。各元素的检出限在0.003~0.142 mg·kg-1之间。应用所提出的方法分析花粉标准物质(GBW 10026),所得测定值与认定值一致。采用本方法和电感耦合等离子体质谱法对松子样品进行测定,结果表明:两者的测定结果无显著性差异,本方法测得各元素的相对标准偏差(n=6)在0.8%~4.7%之间。

Abstract: A method of total reflection X-ray fluorescence spectrometry for the determination of 16 mineral elements, i.e. K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Rb, Sr and Pb, in pine nuts was proposed. The pine nut sample was digested with MWS-2 microwave digestion system for 50 min at 180 ℃. Gallium was used as internal standard. Detection limits of the elements were found in the range of 0.003-0.142 mg·kg-1. In the analysis of the CRM of pollen (GBW 10026) by this method, results obtained were in consistency with the certified values. The pine nut sample was analysed by the proposed method and the ICP-MS method. It was found that there was no significant difference between the results obtained by the 2 methods. Values of RSD′s (n=6) of the results found by the proposed method were in the range of 0.8%-4.7%.