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Comparison of Emissivity, Transmittance, and Reflectance Infrared Spectra of Polycyclic Aromatic Hydrocarbons with those of Atmospheric Particulates (PM1)

Category: Optical/Radiative Properties and Remote Sensing

Volume: 15 | Issue: 4 | Pages: 1627-1639
DOI: 10.4209/aaqr.2014.12.0329
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Dayana M. Agudelo-Castañeda1, Elba Calesso Teixeira 1,2, Ismael Luís Schneider1, Silvia Beatriz Alves Rolim1, Naira Balzaretti3, Gabriel Silva e Silva3

  • 1 Programa de Pós-Graduação em Sensoriamento Remoto, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
  • 2 Fundação Estadual de Proteção Ambiental Henrique Luís Roessler, Porto Alegre, RS, Brazil
  • 3 Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil

Highlights

Spectral features of PAHs in samples of PM1.0 using infrared spectrometry.
Solid PAHs standards results allowed to effectively identify PAHs in PM1.0.
Greatest number of bands of PAHs occurred in the 680–900 cm–1 spectral range.
PAHs can be distinguished by their infrared spectral fingerprints.


Abstract

Polycyclic Aromatic Hydrocarbons (PAHs) are a group of various complex organic compounds composed of carbon and hydrogen, and two or more condensed benzene rings. They are released into the atmosphere by the incomplete combustion or pyrolysis of organic matter. Some of the major sources of PAHs are burning of coal, wood, oil or gas, vehicle engines exhaust, and open burning. PAHs are of great concern to human health mainly because of their known carcinogenic and mutagenic properties. Consequently, it is very important to study atmospheric PAHs, especially those associated with ultrafine particles. This study aims to identify the spectral features of PAHs in samples of particulate matter < 1 µm (PM1) using infrared spectrometry. Emissivity and transmittance spectra of PAHs were obtained by infrared spectroscopy. PAHs standards spectra contributed to effectively identify PAHs in PM1 samples. Emissivity and transmittance spectra in the range of 680–900 cm–1 exhibited the largest number of bands due to C–C out-of-plane angular deformations and C–H out-of-plane angular deformations. Bands of medium intensity in 2900–3050 cm–1 region were also observed due to C–H stretching typical of aromatic compounds, although with lower intensity. This study compared the emissivity and transmittance spectra acquired using two different infrared spectrometers in order to identify PAHs in samples of atmospheric particulate matter and analyzed the capability and advantages of each of the infrared spectrometers. In addition, it was confirmed that the PAHs under study can be distinguished by their infrared spectral fingerprints.

Keywords

FTIR Emissivity Transmittance Particulate matter PAH


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