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研究了不同浓度下乙二酸对元素电感耦合等离子体质谱(ICP-MS)行为的影响。结果表明,低浓度乙二酸对所分析元素的灵敏度具有显著的增敏效应,尤其是对电离电位在9~11eV的Be,Zn,Se,As,Sb,Hg等高电离电位元素。作为一种增敏剂,乙二酸可以补偿由于无机基体的存在对高电离电位元素所产生的信号抑制现象,从而提高其分析灵敏度2~10倍。采用所建立的方法测定了水标准物质中的Be,Zn,Se,As,Sb和Hg,其测定结果与标准物质的认定值基本一致。
The effect of oxalic acid on the behavior of elemental inductively coupled plasma mass spectrometry (ICP-MS) at different concentrations was studied. The results showed that the low concentration of oxalic acid has a significant sensitizing effect on the sensitivity of the analyzed elements, especially the high ionization potential elements such as Be, Zn, Se, As, Sb and Hg with an ionization potential of 9-11 eV. As a sensitizer, oxalic acid can compensate for the phenomenon of signal inhibition caused by the presence of inorganic matrix on high ionization potential elements, thereby increasing its analytical sensitivity by 2 to 10 times. The established method was used to determine the contents of Be, Zn, Se, As, Sb and Hg in water standard materials. The results of determination were consistent with those of standard materials.