Lead speciation studies on coarse and fine aerosol particles by bulk and micro X-ray absorption fine structure spectroscopy

Access this Article

Search this Article

Author(s)

Abstract

<p>Lead species in size-fractionated aerosol particles collected at Higashi-Hiroshima, Japan, were determined by bulk and micro-X-ray absorption fine structure (μ-XAFS) spectroscopy and microbeam X-ray fluorescence (μ-XRF) analysis with thermodynamics calculation. The dominant Pb species in fine aerosol particles were PbSO<sub>4</sub>, PbC<sub>2</sub>O<sub>4</sub> and Pb(NO<sub>3</sub>)<sub>2</sub>. The species mixed internally. The Pb species in fine aerosol particles estimated by thermodynamics calculations were consistent with those estimated by XAFS spectroscopy. Results suggest that Pb species in fine aerosol particles were formed by an in-cloud process related to aquatic chemistry. In addition to the in-cloud process, heterogeneous reaction of Pb with NOx, SO<sub>2</sub> and oxalic acid is also an important reaction pathway for dominant Pb species in fine aerosol particles. Lead species in coarse aerosol particles were 2PbCO<sub>3</sub>·Pb(OH)<sub>2</sub>, Pb(NO<sub>3</sub>)<sub>2</sub> and PbC<sub>2</sub>O<sub>4</sub>. Basic Pb carbonate, a main component of white road paint, the most dominant Pb species. The chemical reaction between 2PbCO<sub>3</sub>·Pb(OH)<sub>2</sub> and HNO<sub>3</sub> in the atmosphere forms Pb(NO<sub>3</sub>)<sub>2</sub>. In addition to these dominant species, μ-XAFS detected minor species overlooked by bulk-XAFS. Thus, the combination of μ-XRF, μ-XAFS, bulk-XAFS and thermodynamics calculation is a powerful strategy for reliable and accurate Pb speciation and source apportionment.</p>

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 51(3), 215-225, 2017

    GEOCHEMICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130006837067
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • ISSN
    0016-7002
  • NDL Article ID
    028208917
  • NDL Call No.
    Z53-R488
  • Data Source
    NDL  J-STAGE 
Page Top