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Development of diffuse reflectance infrared Fourier transform spectroscopy for the rapid characterization of aerosols

机译：漫反射红外傅里叶变换光谱技术的发展，用于气溶胶的快速表征

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摘要

In this study, the viability of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) for quantitative analysis of atmospheric aerosols is assessed. DRIFTS-derived absorption frequencies of the functional groups contained in aerosols are calibrated using ion chromatography (IC) and the calibrated concentrations are applied in an analysis of the major salt species contained in aerosols of various diameters collected in the city of Tainan in southern Taiwan. We found that the average discrepancy between measurements of SO_4~(2-), NH_4~+ and NO_3~- content from IC and DRIFTS was always < 2% (1.21% for SO_4~(2-), 0.41% for NH_4~+, and 0.61% for NO_3~-), indicating that these two methods yield similar results and thus demonstrating that DRIFTS is a practical method for measuring these inorganic salts in aerosols. Results of the DRIFTS measurements indicate that the wavenumber absorbed by SO_4~(2-) changes with increasing or decreasing SO_3~(2-), demonstrating that SO_4~(2-) is formed from SO_3~(2-) via SO_2. Additionally, (NH_4)_2SO_4 and NH_4NO_3, distributed in 0.10-0.32 μm (condensation mode) and 0.56-1.8 μm (droplet mode) particles, are shown to be the combination forms of secondary aerosols in the study area.
机译：在这项研究中，评估了用于大气气溶胶定量分析的漫反射红外傅里叶变换光谱（DRIFTS）的可行性。使用离子色谱（IC）校准了气溶胶中所含官能团的DRIFTS吸收频率，并将校准后的浓度用于分析台湾南部台南市各种直径的气溶胶中所含的主要盐类。我们发现IC和DRIFTS的SO_4〜（2-），NH_4〜+和NO_3〜-含量的测量值之间的平均差异始终<2％（SO_4〜（2-）为1.21％，NH_4〜+为0.41％ ，对于NO_3〜-则为0.61％），表明这两种方法产生相似的结果，因此表明DRIFTS是测量气溶胶中这些无机盐的实用方法。 DRIFTS测量结果表明，SO_4〜（2-）吸收的波数随SO_3〜（2-）的增加或减少而变化，表明SO_3〜（2-）通过SO_2形成SO_4〜（2-）。此外，分布在0.10-0.32μm（冷凝模式）和0.56-1.8μm（液滴模式）颗粒中的（NH_4）_2SO_4和NH_4NO_3是研究区域中次级气溶胶的组合形式。

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