激光剥蚀-电感耦合等离子体发射光谱法在中低合金钢成分分析中的应用研究

Study on application of composition analysis of middle-low alloy steel by laser ablation-inductively coupled plasma optical emission spectrometry

将激光剥蚀(LA)固体直接进样技术与电感耦合等离子体发射光谱法(ICP-OES)联用,并应用于中低合金钢成分分析。通过选取中低合金钢中各组分元素的分析线波长、扣除干扰背景、校正激光参数和选取基体元素Fe(274.9nm)作为内标元素校正信号的漂移,建立了中低合金钢中Al、As、B、C、Co、Cr、Cu、Mn、Mo、Nb、Ni、P、S、Sb、Si、Sn、Ti、V、W、Zr 20种元素的LA-ICP-OES定量分析方法。研究结果表明:校准曲线的线性相关系数除硼、碳和硫外,其他元素都在0.9或0.99以上;各元素的检出限比较低,能满足中低合金钢的测定要求。方法用于测定中低合金钢标样中的上述20种元素,除个别元素在个别样品上的测定结果偏差稍大外,其他元素的测定值与认定值一致。

The laser ablation （LA） solid direct sampling technology was combined with inductively coupled plasma optical emission spectrometry （ICP-OES）, and then applied to the composition analy- sis of middle-low alloy steel. The analytical line wavelengths of elements in middle-low alloy steel were selected, the background interference was deducted, and the signal drifting was corrected by cor- recting laser parameters and selecting matrix element Fe （274. 9nm） as internal standard. Consequent- ly, the quantitative analysis method of 20 elements in middle-low alloy steel （A1, As, B, C, Co, Cr, Cu, Mn, Mo, Nb, Ni, P, S, Sb, Si, Sn, Ti, V, W and Zr） by LA-ICP-OES was established. The results showed that, except for boron, carbon and sulfur, the linear correlation coefficients of calibra- tion curves of other elements were higher 0.9 or 0.99. The detect limits of elements were low and could meet the determination requirements of middle-low alloy steel. The proposed method was ap- plied to the determination of 20 elements above in standard sample of middle-low alloy steel. The de- termination results of most elements were consistent with the certified values, and only several ele- ments in several samples showed relatively large deviation.