Absorption spectrum of ambient aerosol and its correlation with size distribution in specific atmospheric conditions after a red mud accident

Ágnes Filep, Tibor Ajtai, Noémi Utry, Máté D. Pintér, Tünde Nyilas, Szabolcs Takács, Zsuzsanna Máté, A. Gelencsér, A. Hoffer, Martin Schnaiter, Z. Bozóki, Gábor Szabó

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Approximately one month after a red sludge industrial accident, a high concentration of atmospheric aerosol was reported in the affected area. This increased aerosol load originated mainly from the fugitive dust emitted from the red sludge sediment, representing a serious threat to public health. In a study presented here, a recently developed four-wavelength photoacoustic spectrometer (4λ-PAS), which simultaneously measures optical aerosol absorption in the near infrared, visible and ultra-violet spectral ranges with high temporal resolution, was operated in the centre of the sludge hit area. Based on the results of the photoacoustic absorption measurements of temporal changes in light absorption and their correlations with other aerosol variables, including size distribution, were carried out in special atmospheric conditions (including with the presence of "atypical" red mud particles). Correlations between segregated absorption Ångström exponents (AAEs) and specific size ranges were tabulated, and the resulting data were used to draw conclusions about the reasons for the temporal changes to the measured quantities. The absorption behavior of red mud particles was determined in UV, VIS, and near IR spectral regions under laboratory conditions. The absorption spectrum of red mud aerosol was found to be atypical (i.e., it did not follow a power law), and this was used as a selective parameter for its identification in ambient bulk. Each measurement day, at around noon, dust from the red sludge sediment was identified; while during the rest of the day atmospheric aerosol composition was dominated by carbonaceous aerosols, originating most probably from home heating and/or from traffic. In-situ number concentration and size distribution measurements confirm this interpretation of the measurements obtained with 4λ-PAS.

Original languageEnglish
Pages (from-to)49-59
Number of pages11
JournalAerosol and Air Quality Research
Volume13
Issue number1
DOIs
Publication statusPublished - 2013

Fingerprint

absorption spectrum
Aerosols
accident
Absorption spectra
Accidents
mud
aerosol
Atmospheric aerosols
Photoacoustic effect
Dust
Sediments
sludge
Public health
dust
Light absorption
aerosol composition
Spectrometers
Infrared radiation
sediment
range size

Keywords

  • Ångström exponent
  • Photoacoustic spectroscopy
  • SMPS

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Absorption spectrum of ambient aerosol and its correlation with size distribution in specific atmospheric conditions after a red mud accident. / Filep, Ágnes; Ajtai, Tibor; Utry, Noémi; Pintér, Máté D.; Nyilas, Tünde; Takács, Szabolcs; Máté, Zsuzsanna; Gelencsér, A.; Hoffer, A.; Schnaiter, Martin; Bozóki, Z.; Szabó, Gábor.

In: Aerosol and Air Quality Research, Vol. 13, No. 1, 2013, p. 49-59.

Research output: Contribution to journalArticle

Filep, Ágnes ; Ajtai, Tibor ; Utry, Noémi ; Pintér, Máté D. ; Nyilas, Tünde ; Takács, Szabolcs ; Máté, Zsuzsanna ; Gelencsér, A. ; Hoffer, A. ; Schnaiter, Martin ; Bozóki, Z. ; Szabó, Gábor. / Absorption spectrum of ambient aerosol and its correlation with size distribution in specific atmospheric conditions after a red mud accident. In: Aerosol and Air Quality Research. 2013 ; Vol. 13, No. 1. pp. 49-59.
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