Airborne particulate matter (PM) filter analysis and modeling by total reflection X-ray fluorescence (TXRF) and X-ray standing wave (XSW)
Airborne particulate matter (PM) filter analysis and modeling by total reflection X-ray fluorescence (TXRF) and X-ray standing wave (XSW)
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DOI：
10.1016/j.talanta.2011.11.073
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发表时间：
2012-01-30
期刊：
影响因子：
6.1
通讯作者：
Bontempi, E.
中科院分区：
文献类型：
--
作者：
Borgese, L.;Salmistraro, M.;Bontempi, E.
这项工作是对最近引入的空气颗粒物(PM)过滤器分析方法的改进[1]。X射线驻波(XSW)和全反射X射线荧光(TXRF)是用一种新的专用实验室仪器进行的。同时进行XSW和TXRF的主要优点是可以区分样品的性质：如果样品是小液滴干残留物、薄膜样样品或大块样品。另一个优点与选择全反射角度进行TXRF测量的可能性有关。最后，切换X射线源的可能性使得能够更准确地测量更轻和更重的元素(改变X射线阳极，例如从钼到铜)。本研究的目的是为新提出的机载PM滤清器定量分析方法奠定理论基础，通过外标法提高定量化的准确度和效率。提出和讨论的理论模型表明，空气中的PM滤光片可以看作是薄层。在实验室制备了一套参考样品，并用于获得校准曲线。结果表明，所提出的空气颗粒物滤清器定量分析方法是经济可靠的，不需要消化滤清器即可获得定量的化学分析结果，并且XSW的使用提高了TXRF分析的准确度。(C)2011爱思唯尔B.V.保留所有权利。
This work is presented as an improvement of a recently introduced method for airborne particulate matter (PM) filter analysis [1]. X-ray standing wave (XSW) and total reflection X-ray fluorescence (TXRF) were performed with a new dedicated laboratory instrumentation. The main advantage of performing both XSW and TXRF, is the possibility to distinguish the nature of the sample: if it is a small droplet dry residue, a thin film like or a bulk sample. Another advantage is related to the possibility to select the angle of total reflection to make TXRF measurements. Finally, the possibility to switch the X-ray source allows to measure with more accuracy lighter and heavier elements (with a change in X-ray anode, for example from Mo to Cu). The aim of the present study is to lay the theoretical foundation of the new proposed method for airborne PM filters quantitative analysis improving the accuracy and efficiency of quantification by means of an external standard. The theoretical model presented and discussed demonstrated that airborne PM filters can be considered as thin layers. A set of reference samples is prepared in laboratory and used to obtain a calibration curve. Our results demonstrate that the proposed method for quantitative analysis of air PM filters is affordable and reliable without the necessity to digest filters to obtain quantitative chemical analysis, and that the use of XSW improve the accuracy of TXRF analysis. (C) 2011 Elsevier B.V. All rights reserved.