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Chemical Composition of Atmospheric Aerosol (PM10) at a Semi-arid Urban Site: Influence of Terrestrial Sources

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Abstract

Atmospheric aerosol (PM10) measurements were made at a regional representative semi-arid urban site, Tirupati, India over one-year period i.e. from October, 2001 to September, 2002. The samples were collected on polyflex filters, and analyzed for the major water-soluble ions – F, Cl, NO3, SO4, Na, NH4, K, Ca and Mg, employing ion chromatograph. The average mass of PM10 is found to be 32.75 μg/m3 with a total water-soluble aerosol load (total anion + total cation) of 13.56 μg/m3. Composition of aerosol showed higher concentration of SO4 followed by Na, Ca and NO3. Very good correlation is observed between crustal ions Ca and Mg (r=0.82) as well as between crustal and acidic ions; Ca and SO4 (r=0.75) and NO3 (r=0.67) and Mg and NO3 (r=0.78) and SO4 (r=0.73), suggest that the ionic composition was influenced by local terrestrial sources. The presence of SO4 and NO3 may be due to re-suspension of soil particles (formation by heterogeneous oxidation). Ca, Mg and Na are mainly soil derived ones. Correlation matrix with meteorological factors, as well as seasonal distribution of PM10 and its ionic components present a clear trend of higher concentrations during summer due to greater particle release and lowering atmospheric levels during the rainy season due to washout effect. ANOVA results showed the significant variation of composition from season to season. Paired comparisons (DMRT) revealed the occurrence of significant difference in pairs of mean concentration from season to season except within monsoon i.e. between S-W and N-E monsoon.

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Authors and Affiliations

  1. Electrochemical Research Laboratories, Department of Chemistry, Sri Venkateswara University, Tirupati, 517 502, India

    P. Chandra Mouli & S. Jayarama Reddy

  2. Biochemical and Environmental Engineering Center, Indian Institute of Chemical Technology, Hyderabad, 500 007, India

    S. Venkata Mohan

Authors
  1. P. Chandra Mouli
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  2. S. Venkata Mohan
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  3. S. Jayarama Reddy
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Correspondence to S. Jayarama Reddy.

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Mouli, P.C., Mohan, S.V. & Reddy, S.J. Chemical Composition of Atmospheric Aerosol (PM10) at a Semi-arid Urban Site: Influence of Terrestrial Sources. Environ Monit Assess 117, 291–305 (2006). https://doi.org/10.1007/s10661-006-0988-6

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  • DOI: https://doi.org/10.1007/s10661-006-0988-6

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