Investigation of particle size-related artifacts in analyte quantification of particulate samples using infrared spectroscopy methods

IF 2.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL
Kabir Rishi , Orthodoxia Zervaki , Bon-Ki Ku , Nicholas Pugh , Chen Wang , Vasileia Vogiazi , Pramod Kulkarni
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Abstract

Infrared absorption spectroscopy is commonly used to quantify chemicals in the particulate phase for environmental and occupational aerosol exposure measurements. Unlike gas-phase analyte quantification, the analytical figures of merit depend on the characteristics of the particulate phase, in particular the aerosol size distribution. In the Mie scattering regime, where the particle size is comparable to the incident infrared wavelength, the bias in analyte quantification can depend on particle size. This error may depend on how well the size distribution of the aerosol matches with that of the reference material used to calibrate the method. While the impact of packing densities, and spectral interferences from the substrate and other minerals in the aerosol has been assessed in previous work, the impact of aerosol size distribution has not been explored. In this work, the Lorenz-Mie solution to Maxwell's equation was used to determine the bias in mass quantification of quartz in typical occupational aerosols for which the IR method is commonly used. Our experimental findings were benchmarked with the Lorenz-Mie solution using model spherical polystyrene particles. Practical deviations due to the asymmetric shape of quartz particles size-fractionated using different cascade impactors are presented and compared with literature studies on quartz aerosols. The expected bias in analyte quantification using different quartz standard reference materials relative to NIST SRM 1878a was assessed. The implications on quartz quantification due to differences in aerosol size distribution at different locations in the coal mine, granite quarries, and during construction activities such as stone finishing and grinding are presented and discussed.
用红外光谱法研究颗粒样品分析物定量中与颗粒大小相关的伪影
红外吸收光谱通常用于量化颗粒相中的化学物质,用于环境和职业气溶胶暴露测量。与气相分析物的定量不同,优点的分析数字取决于颗粒相的特征,特别是气溶胶大小分布。在Mie散射体系中,颗粒尺寸与入射红外波长相当,分析物定量中的偏差可能取决于颗粒尺寸。这种误差可能取决于气溶胶的大小分布与用于校准方法的参考物质的大小分布的匹配程度。虽然在以前的工作中已经评估了堆积密度的影响,以及来自基质和气溶胶中其他矿物的光谱干扰,但尚未探讨气溶胶大小分布的影响。在这项工作中,使用麦克斯韦方程的Lorenz-Mie解来确定典型职业气溶胶中石英的质量定量偏差,其中红外方法是常用的。我们的实验结果以Lorenz-Mie溶液为基准,使用模型球形聚苯乙烯颗粒。本文介绍了不同级联冲击器分馏石英颗粒尺寸的不对称形状造成的实际偏差,并与文献研究石英气溶胶进行了比较。使用不同的石英标准参考物质相对于NIST SRM 1878a分析物定量的预期偏差进行了评估。本文提出并讨论了在煤矿、花岗岩采石场和建筑活动(如石材精加工和研磨)中不同位置气溶胶粒径分布的差异对石英定量的影响。
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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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