基于LA-ICP-MS的软质样品定量分析研究进展

    Research Progress in Quantitative Analysis of Soft Samples Based on LA-ICP-MS

    • 摘要: 激光剥蚀电感耦合等离子体质谱法(LA-ICP-MS)在近年来引起诸多关注,因为其能在准无损的条件下直接对固体样品分析,并且获得一定空间分辨率的原位元素浓度信息。然而由于元素分馏以及复杂的基质效应,LA-ICP-MS对于软质样品的定量分析仍具有挑战性。如要获得可靠可比的结果,相应的测量方案不仅需要使用经过验证的方法,还应建立基于标准物质的正确校正方法,从而实现测量结果的溯源性。本文通过分析2000年以来国内外研究团队发表的相关文献,介绍了LA-ICP-MS在三类不同软质样品测量中的常见测量策略,在此基础上通过汇总五个方面验证参数的情况,从方法精度、准确度、代表性三方面分析了定量方法的现状,并说明方法溯源性方面存在的问题。结果显示,基质匹配且同步测量的定量策略更有优势,另外受制于缺少完全基质匹配的CRM,领域内对于取样代表性及测量结果溯源性的研究并不充分。因此这两方面的相关内容,将会是未来利用LA-ICP-MS开展软质样品定量分析方法研究时需要重点解决的问题。国内在软质标准物质的合成方法和利用同位素稀释法实现测量结果溯源性等方面开展了一些研究,但依然有一系列问题尚待解决。

       

      Abstract: Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has gained significant attention in recent years due to its capability to directly analyze solid samples under quasi-nondestructive conditions, and to provide in-situ elemental concentration information with a certain spatial resolution. However, quantitative analysis of soft samples by LA-ICP-MS remains a challenge due to elemental fractionation and complex matrix effects. To obtain reliable and comparable results, the corresponding measurement protocol not only requires the use of verified methods, but also the establishment of correct calibration methods based on standards, thus enabling the traceability of measurement results. This paper reviews relevant literature published by domestic and foreign research teams since 2000, and introduces the common measurement strategies of LA-ICP-MS for three different types of soft samples. By summarizing the verification parameters of the five methods, the current situation of quantitative methods is analyzed from three aspects: method precision, accuracy, and representativeness. The paper also highlights the problem of method traceability. The results show that the quantification strategy that matches the matrix and is synchronized with the measurement is more advantageous. However, the lack of a fully matrix-matched certified reference material (CRM) limits the research on sampling representativeness and traceability of measurement results. Therefore, these two aspects will be the key problems to be addressed in the future when using LA-ICP-MS to carry out quantitative analysis methods of soft samples. Although some researchers have conducted studies on the synthesis method of soft standard and the traceability of measurement results by isotope dilution method, there are still several issues that need to be resolved.

       

    /

    返回文章
    返回