基体效应对电感耦合等离子体质谱法测定钢铁中痕量硼的影响

Matrix Effect in Determination of Trace Amounts of Boron in Iron and Steel by ICP-MS

对电感耦合等离子体质谱法测定钢铁中痕量硼时,存在的基体效应进行了研究。对样品分析中制作标准曲线用于精准基体匹配的纯铁中硼含量需定值。结果表明:精准基体匹配法适用于钢铁中硼含量低于0.000 3%的样品的分析,精密度好;用于绘制标准曲线的纯铁应不含有硼,或硼含量低于0.000 1%,试验证明了铁基体对硼测定存在着较强的抑制效应,给出了它们之间存在的线性关系。方法应用于钢铁有证标准钢铁样品中痕量硼的测定,测定值与标准值相符合。

A study on the matrix effect in the determination of trace amounts of boron in iron and steel by ICP-MS was made and reported in this paper.Significant depression of intensity of spectral line of boron by the matrix iron was observed and the rate of attenuation was effected by the amount of iron present.It was found that by applying the precise matrix matching method to the ICP-MS determination of boron in iron and steel with contents lower than（wB） 0.000 3%,satisfactory precision was attained.It was shown that the pure iron used for matrix matching in preparation of standard curve should contain no or less than（wB） 0.000 1% of boron.Hence,it is necessary to analyze the pure iron for its boron content before using for matrix matching.The proposed method was applied to the analysis of CRM′s of steels,giving values of boron contents in consistency with the certified values.