Quantitative sampling and analysis of trace elements in atmospheric aerosols: impactor characterization and Synchrotron-XRF mass calibration.
Quantitative sampling and analysis of trace elements in atmospheric aerosols: impactor characterization and Synchrotron-XRF mass calibration.
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DOI：
10.5194/amt-3-1473-2010
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发表时间：
2010-10
影响因子：
3.8
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中科院分区：
文献类型：
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摘要。环境空气中微量元素的鉴定可以为污染源分配研究增加大量信息，尽管它们在质量方面对排放没有重大贡献。提出了一种利用旋转鼓式冲击器和基于同步辐射的x射线荧光定量评价环境气溶胶中痕量元素大小和时间分辨的方法。通过对油盐颗粒的实验，研究了冲击器的收集效率曲线和粒度偏析特性。切断直径是通过两个粒度仪测量的粒度分布的比值来确定的。此外，开发了一种外部校准技术，以经验将荧光强度与环境浓度联系起来。用喷墨打印机将元素标准溶液应用于薄膜上，随后用外部湿化学方法评估面积浓度。这些定制和可重复使用的参考标准可以在不同的实验条件下分析不同的数据集。
Abstract. Identification of trace elements in ambient air can add substantial information to pollution source apportionment studies, although they do not contribute significantly to emissions in terms of mass. A method for quantitative size and time-resolved trace element evaluation in ambient aerosols with a rotating drum impactor and synchrotron radiation based X-ray fluorescence is presented. The impactor collection efficiency curves and size segregation characteristics were investigated in an experiment with oil and salt particles. Cutoff diameters were determined through the ratio of size distributions measured with two particle sizers. Furthermore, an external calibration technique to empirically link fluorescence intensities to ambient concentrations was developed. Solutions of elemental standards were applied with an ink-jet printer on thin films and area concentrations were subsequently evaluated with external wet chemical methods. These customized and reusable reference standards enable quantification of different data sets analyzed under varying experimental conditions.